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	<title>plant growth and development &#8211; Science</title>
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	<title>plant growth and development &#8211; Science</title>
	<link>https://scienmag.com</link>
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		<title>GASA/snakin proteins reveal conserved structure and diverse plant functions</title>
		<link>https://scienmag.com/gasa-snakin-proteins-reveal-conserved-structure-and-diverse-plant-functions/</link>
		
		<dc:creator><![CDATA[Gavin Prescott]]></dc:creator>
		<pubDate>Sun, 06 Sep 2026 09:32:57 +0000</pubDate>
				<category><![CDATA[Biology]]></category>
		<category><![CDATA[conserved plant peptide family]]></category>
		<category><![CDATA[cysteine-rich plant peptides]]></category>
		<category><![CDATA[evolutionary history of plant proteins]]></category>
		<category><![CDATA[GASA/Snakin protein family]]></category>
		<category><![CDATA[genome-wide plant protein studies]]></category>
		<category><![CDATA[genome-wide plant proteomics]]></category>
		<category><![CDATA[Plant defense peptides]]></category>
		<category><![CDATA[plant environmental adaptation]]></category>
		<category><![CDATA[plant environmental stress response]]></category>
		<category><![CDATA[plant GASA/Snakin proteins]]></category>
		<category><![CDATA[plant growth and development]]></category>
		<category><![CDATA[plant growth and development hormones]]></category>
		<category><![CDATA[plant hormone signaling]]></category>
		<category><![CDATA[plant molecular biology review]]></category>
		<category><![CDATA[plant peptide evolution]]></category>
		<category><![CDATA[plant redox regulation]]></category>
		<category><![CDATA[plant stress response mechanisms]]></category>
		<category><![CDATA[structural conservation in plant proteins]]></category>
		<category><![CDATA[structural properties of plant peptides]]></category>
		<category><![CDATA[sustainable agriculture and plant biotechnology]]></category>
		<category><![CDATA[vascular plant-specific proteins]]></category>
		<guid isPermaLink="false">https://scienmag.com/gasa-snakin-proteins-reveal-conserved-structure-and-diverse-plant-functions/</guid>

					<description><![CDATA[Deep inside plant genomes lies a family of small proteins so structurally rigid that they survive boiling, so chemically versatile that they can both shield cells from oxidative damage and, in some contexts, promote it, and so evolutionarily ancient that they appear exclusively in vascular plants. A new review published in Plant Molecular Biology by [&#8230;]]]></description>
										<content:encoded><![CDATA[<p>Deep inside plant genomes lies a family of small proteins so structurally rigid that they survive boiling, so chemically versatile that they can both shield cells from oxidative damage and, in some contexts, promote it, and so evolutionarily ancient that they appear exclusively in vascular plants. A new review published in Plant Molecular Biology by Abdullah of Tianjin University of Traditional Chinese Medicine and Parviz Heidari of Shahrood University of Technology synthesizes the exploding literature on the GASA/Snakin protein family into a unified framework, arguing that these cysteine-rich peptides function as conserved redox–hormone regulatory hubs that coordinate growth, development, and environmental adaptation across the plant kingdom. Drawing on more than 35 genome-wide characterization studies published between 2020 and 2026 alone, the authors assemble an evolutionary, structural, and functional portrait of one of plant biology&#8217;s most consistently underappreciated peptide families, and they lay out a research roadmap aimed at translating that knowledge into sustainable agriculture.</p>
<p>The GASA name traces back to &#8220;Gibberellic Acid-Stimulated Arabidopsis,&#8221; a label earned in the 1990s when researchers identified small genes in Arabidopsis thaliana whose expression surged in response to gibberellin, the hormone that drives stem elongation, germination, and flowering. The tomato counterpart, GA-stimulated transcript 1 or GAST1, had already hinted at a wider family. What unites every member is a signature domain defined by twelve highly conserved cysteine residues. These cysteines pair up to form as many as six intramolecular disulfide bonds, cross-linking the peptide into a thermostable helical scaffold that resists heat, proteolysis, and chemical denaturation. The only experimental three-dimensional structure solved to date, obtained through an elegant racemic protein crystallography approach that overcame radiation damage, revealed a unique helix-turn-helix architecture unlike any other plant peptide fold. That structural rigidity, the review emphasizes, is almost certainly the reason the twelve-cysteine spacing pattern has been maintained under purifying selection across hundreds of millions of years of vascular plant evolution: there is simply very little biochemical room to maneuver without destroying the fold.</p>
<p>Phylogenetically, the family is restricted to vascular plants and shows remarkable variation in size depending on genome architecture. Rice carries roughly ten GASA genes, while polyploid crops such as peanut (Arachis hypogaea) harbor approximately forty. The review traces this expansion to whole-genome duplication events, segmental duplications, and tandem duplications, with polyploid lineages naturally amplifying their member counts. Despite this numerical diversity, phylogenetic analyses predominantly resolve three conserved subfamilies that persist across both monocots and eudicots, suggesting that the ancestral functions were partitioned early and retained. Subfamily I is generally associated with gibberellin-responsive growth regulation, Subfamily II with antimicrobial defense, and Subfamily III with abiotic stress adaptation. This tripartite division, the authors caution, is a statistical tendency rather than a rigid rule, but it provides a useful predictive lens for assigning tentative functions to newly discovered members in orphan crops.</p>
<p>The defense arm of the family has the longest experimental pedigree. Snakin-1, isolated from potato tubers in 1999, was among the first plant antimicrobial peptides shown to be broadly active against fungal and bacterial pathogens. Snakin-2, also from potato, is locally induced by wounding and pathogen attack, positioning these peptides as sentinels of the plant&#8217;s first line of chemical defense. The antimicrobial mechanism exploits the cationic, cysteine-stabilized structure: the peptides bind negatively charged microbial membranes and disrupt them, while the disulfide-bonded scaffold prevents degradation by microbial proteases. The translational potential is striking. Overexpressing the potato snakin-1 gene has conferred resistance to Rhizoctonia solani and Erwinia carotovora in transgenic potato, to powdery mildew in wheat, to take-all pathogen Gaeumannomyces graminis in wheat, and to Rhizoctonia and Sclerotinia in lettuce. Soybean GmSN1 overexpression enhances virus resistance in both Arabidopsis and soybean, and snakin-derived peptides such as snakin-Z from jujube fruit show broad in vitro antimicrobial activity. A 2026 pangenomic study of citrus rootstocks has now moved the field toward identifying active GASA antimicrobial genes specifically for resistance breeding against bacterial pathogens, a step the review highlights as emblematic of the family&#8217;s agricultural promise.</p>
<p>On the growth side, GASA proteins sit downstream of DELLA proteins, the central repressors of gibberellin signaling. In Arabidopsis, GASA genes are transcriptional targets of DELLA proteins acting through indeterminate-domain transcription factors, embedding the family directly into the GA signaling cascade. Arabidopsis GASA4 promotes GA responses, flowering, and seed development; GASA5 suppresses gibberellin responses and delays flowering; and OsGSR1 in rice participates in crosstalk between gibberellin and brassinosteroid pathways, physically linking two of the most important growth-regulating hormonal systems. Beyond Arabidopsis and rice, the family shapes agronomically critical traits across species: EjGASA6 in loquat promotes flowering and root elongation by enhancing gibberellin biosynthesis, FaGAST1 and FaGAST2 in strawberry jointly determine the cell size of the fruit receptacle, SlGASA1 in tomato acts as a repressor of fruit ripening, and DkGASA4 in persimmon participates in gibberellin-regulated postharvest softening. GmGASA32 in soybean promotes plant height through interaction with the cell cycle regulator GmCDC25, while maize GASA-like genes govern lateral root development.</p>
<p>Perhaps the most conceptually significant contribution of the new review is its synthesis of the family&#8217;s redox chemistry into a single explanatory model. Several GASA members are demonstrably redox-active proteins. Arabidopsis GASA4 exhibits redox activity in bacteria and in plants, promoting GA responses. Petunia GIP2 displays antioxidant activity in planta. GASA14 in Arabidopsis regulates leaf expansion and abiotic stress resistance by modulating reactive oxygen species accumulation, and GASA5 has been characterized as a redox-active metalloprotein that suppresses gibberellin responses, with metal-binding capacity likely modulating its chemical behavior. The review argues that the direction of redox output, whether antioxidant protection or oxidative sensitization, is subfamily-specific and contingent on cellular context and metal binding. In this view, GASA proteins do not merely respond to hormonal signals; they translate those signals into tuned adjustments of the cellular redox state, which in turn feeds back on hormone perception and gene expression. The authors formalize this as a redox–hormone hub model, in which individual GASA peptides act as molecular junctions where hormonal information and oxidative state converge.</p>
<p>That integrative role extends across an impressive array of hormonal pathways. The review documents inputs from at least six phytohormones: gibberellin, abscisic acid, brassinosteroid, salicylic acid, jasmonic acid, and auxin. Integration occurs through combinatorial cis-regulatory elements in the gene promoters and through direct protein–protein interactions. The evidence is strongest for gibberellin, abscisic acid, and brassinosteroid, where direct binding partners and transcriptional responses have been experimentally validated. Arabidopsis GASA6, for instance, serves as an integrator of gibberellin, abscisic acid, and glucose signaling during seed germination, a perfect demonstration of the hub concept. By contrast, the connections to jasmonic acid and auxin rest primarily on inferential evidence from co-expression and promoter analyses, and the review flags these as priority targets for experimental confirmation.</p>
<p>The stress-resilience literature has grown particularly fast. Genome-wide surveys in durum wheat, sunflower, lettuce, Medicago truncatula, Chinese cabbage, cotton, poplar, rubber tree, pepper, cucumber and other cucurbits, plum, and searocket have linked GASA expression patterns to drought, salt, cold, heat, and nutrient stress. Maize GASA genes respond to low-phosphorus conditions, tying the family to nutrient-use efficiency. Functional proof is accumulating: overexpression of TdGASA19 in marker-free transgenic durum wheat enhances both salt and drought tolerance, and GASA5 overexpression in Arabidopsis increases heat-stress sensitivity, a reminder that family members can act in opposite directions depending on context. The review notes that 2020 to 2026 saw genome-wide characterizations in more than 35 species, a pace of discovery that has far outstripped functional validation.</p>
<p>Against this backdrop of rapid expansion, the authors are refreshingly blunt about the field&#8217;s blind spots. No receptor for any GASA/Snakin peptide has ever been identified, leaving the entire signaling mechanism downstream of these secreted peptides unexplained. Experimental three-dimensional structures remain limited to a single family member. The redox chemistry of most proteins has been inferred rather than measured, and the subfamily assignments of many recently duplicated genes in polyploid crops rest on sequence similarity alone. The review&#8217;s roadmap calls for systematic receptor identification through affinity purification and genetic screens, expanded structural biology, targeted redox biochemistry, and precise genome editing of subfamily-specific members in crops, with the ultimate goal of deploying GASA/Snakin biology to breed plants that grow vigorously under benign conditions yet withstand the pathogens and climatic stresses of a changing world. If the redox–hormone hub model holds, these tiny, boil-proof peptides may turn out to be among the most leverageable molecular targets in modern plant science.</p>
<div class="scienmag-article-metadata"><strong>Subject of Research:</strong> The GASA/Snakin family of secreted cysteine-rich peptides in plants, covering their structural conservation, phylogenomic expansion, hormonal integration, redox activity, and roles in growth, defense, and stress adaptation.</p>
<p><strong>Article Title:</strong> GASA/snakin proteins in plants: structural conservation, phylogenomic expansion, and functional diversity</p>
<p><strong>Article References:</strong> Abdullah, &amp; Heidari, P. (2026). GASA/snakin proteins in plants: structural conservation, phylogenomic expansion, and functional diversity. <em>Plant Molecular Biology, 116</em>(5), Article 89. <a href="https://doi.org/10.1007/s11103-026-01752-4" target="_blank" rel="noopener noreferrer">https://doi.org/10.1007/s11103-026-01752-4</a></p>
<p><strong>Image Credits:</strong> AI Generated</p>
<p><strong>DOI:</strong> <a href="https://doi.org/10.1007/s11103-026-01752-4" target="_blank" rel="noopener noreferrer">10.1007/s11103-026-01752-4</a></p>
<p><strong>Keywords:</strong> GASA, Snakin, cysteine-rich peptides, phytohormone crosstalk, redox regulation, phylogenomics, gibberellin, antimicrobial peptides, abiotic stress, crop improvement</p>
</div>
]]></content:encoded>
					
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">188625</post-id>	</item>
		<item>
		<title>Nitrates and Cytokinins Coordinate Nitrogen Efficiency, Plant Growth, Stress Tolerance, and Yield</title>
		<link>https://scienmag.com/nitrates-and-cytokinins-coordinate-nitrogen-efficiency-plant-growth-stress-tolerance-and-yield/</link>
		
		<dc:creator><![CDATA[Alan Morgan]]></dc:creator>
		<pubDate>Wed, 26 Aug 2026 23:06:32 +0000</pubDate>
				<category><![CDATA[Agriculture]]></category>
		<category><![CDATA[crop yield improvement through hormonal pathways]]></category>
		<category><![CDATA[cytokinin hormone regulation]]></category>
		<category><![CDATA[environmental impact of nitrogen fertilizers]]></category>
		<category><![CDATA[fertilizer optimization strategies]]></category>
		<category><![CDATA[Nitrate signaling in plants]]></category>
		<category><![CDATA[nitrogen leaching and pollution reduction]]></category>
		<category><![CDATA[nitrogen use efficiency in agriculture]]></category>
		<category><![CDATA[plant growth and development]]></category>
		<category><![CDATA[plant molecular and physiological responses to nitrogen]]></category>
		<category><![CDATA[plant nutrient sensing and decision-making]]></category>
		<category><![CDATA[stress tolerance mechanisms in crops]]></category>
		<category><![CDATA[sustainable fertilization practices]]></category>
		<guid isPermaLink="false">https://scienmag.com/nitrates-and-cytokinins-coordinate-nitrogen-efficiency-plant-growth-stress-tolerance-and-yield/</guid>

					<description><![CDATA[Plants may be quietly rewriting the rules of fertilizer use. A new review argues that nitrate—the dominant form of nitrogen applied to many crops—is not merely a raw material for making proteins, chlorophyll and DNA. It is also a chemical signal that helps plants decide where to grow, how aggressively to forage for nutrients, when [&#8230;]]]></description>
										<content:encoded><![CDATA[<p>Plants may be quietly rewriting the rules of fertilizer use. A new review argues that nitrate—the dominant form of nitrogen applied to many crops—is not merely a raw material for making proteins, chlorophyll and DNA. It is also a chemical signal that helps plants decide where to grow, how aggressively to forage for nutrients, when to expand their leaves and how long to keep photosynthesizing. At the center of this decision-making system are cytokinins, a class of plant hormones that connect the nitrogen status of roots with the growth and productivity of shoots. The review, published in <em>Plant and Soil</em>, brings together decades of molecular, physiological and agronomic research to show how the nitrate–cytokinin partnership could become a target for improving nitrogen-use efficiency while reducing fertilizer waste and environmental damage.</p>
<p>Nitrogen is one of the most powerful levers in modern agriculture. When supplies are inadequate, crops often produce less biomass, fewer seeds and smaller grains. Yet applying more nitrogen is not a simple solution. Crops commonly absorb only a fraction of the fertilizer supplied to fields; the remainder can leach into waterways, escape as nitrous oxide or undergo chemical transformations that contribute to air and climate pollution. Farmers therefore face a biological paradox: plants need enough nitrogen to build a productive canopy, but excessive applications are expensive and can damage ecosystems. Nitrogen-use efficiency, or NUE, describes how effectively a plant converts available nitrogen into harvestable yield. According to the review by Dmitry Veselov, Jiangzhe Zhao, Alla Korobova and colleagues, improving NUE will require understanding not just how nitrate enters roots, but how plants interpret its presence and coordinate their entire body in response.</p>
<p>The first step is nitrate perception. Plant roots use transporter proteins to acquire nitrate from soil, but some of these transporters also act as “transceptors”—molecules that combine transport activity with sensory functions. One of the best studied is NRT1.1, also known as CHL1 or NPF6.3 in <em>Arabidopsis</em>. Its activity changes with nitrate concentration, allowing roots to respond across a broad range of nutrient availability. At low nitrate levels, high-affinity NRT2 transporters help capture scarce ions; at higher concentrations, other transport systems become more important. NRT1.1 can also influence the distribution of auxin, another plant hormone, thereby altering the formation and elongation of lateral roots. This allows a plant to proliferate roots in nutrient-rich patches rather than spending the same amount of energy everywhere. Once nitrate is detected, calcium signals, protein phosphorylation and transcription factors such as NLP6 and NLP7 help activate a rapid nitrogen-response program.</p>
<p>Cytokinins add a second layer of control to this nutrient-sensing network. These hormones are produced in roots and shoots, and their concentration depends on a balance between biosynthesis, transport and breakdown. Nitrate availability can stimulate the expression of isopentenyl transferase, or IPT, enzymes involved in cytokinin production. In particular, nitrate-responsive changes in root IPT activity can increase the synthesis of cytokinin precursors, including forms that are converted into trans-zeatin, a biologically active cytokinin. Other enzymes, including cytokinin oxidases and dehydrogenases known as CKXs, remove or deactivate the hormones. The result is a dynamic system rather than a simple on–off switch: a change in nitrate supply can alter cytokinin production, chemical form and movement through the plant. Recent evidence highlighted in the review suggests that fluctuations in nitrate may even influence IPT3 through changes in chromatin and histone modification, allowing roots to adjust hormone production as nutrient conditions shift.</p>
<p>The direction of cytokinin movement is crucial. Root-derived cytokinins can travel upward through the xylem, carrying information about soil conditions to leaves and growing shoots. Transporters such as ABCG14 and related proteins help load and move cytokinin compounds over long distances, while purine permeases and other transport systems contribute to local distribution and hormone homeostasis. The shoot is not simply a passive recipient of this chemical message. It also sends information back to the roots through sugars, nitrogen-containing metabolites and mobile peptides. CEP peptides produced in roots under nitrogen limitation can be processed into signals that travel upward and stimulate shoot-to-root messages, including CEPD-like proteins that regulate nitrate uptake. Cytokinins therefore participate in a two-way conversation: roots report the availability of nitrate, while shoots communicate their demand for additional nitrogen. This feedback prevents the plant from absorbing nutrients indiscriminately when its leaves cannot use them efficiently.</p>
<p>The most visible consequence of this communication appears below ground, where nitrate and cytokinin signals help reshape root architecture. When nitrate is scarce, plants may favor deeper or more extensive roots capable of exploring a larger volume of soil. In a localized nitrate-rich patch, they can stimulate lateral root growth near the nutrient source. Cytokinins interact with auxin in this process, often exerting opposing effects on root and shoot development. High cytokinin activity in some root zones can limit primary root elongation, while reduced cytokinin levels may permit a larger root system. This explains why genetically or chemically reducing cytokinin degradation in roots can produce plants with enhanced root growth, improved mineral accumulation in shoots and greater drought tolerance. The effect is context-dependent, however. A root that grows farther is not automatically more efficient; constructing and maintaining extra tissue requires carbon. The plant must balance the energetic cost of exploration against the expected benefit of finding and absorbing more nitrate.</p>
<p>Above ground, cytokinins help determine whether newly acquired nitrogen becomes productive leaf area or is diverted elsewhere. Adequate cytokinin signaling promotes cell division, leaf expansion and chloroplast development, the process by which cells build the photosynthetic machinery that captures light. In rice, wheat and other cereals, higher cytokinin status has been associated with increased photosynthetic capacity under favorable nitrogen conditions. This connection is chemically logical: nitrogen is required to build chlorophyll and many photosynthetic proteins, including Rubisco, the enzyme that fixes carbon dioxide. Cytokinins can also influence stomatal behavior, chlorophyll maintenance and the expression of genes involved in carbon assimilation. By coordinating nitrogen uptake with photosynthetic activity, the plant can convert absorbed nitrate into sugars more efficiently. Those sugars, in turn, provide energy and carbon skeletons for nitrate assimilation, creating a feedback loop between carbon and nitrogen metabolism.</p>
<p>The review also draws attention to cytokinin’s role in delaying leaf senescence, the orderly deterioration of leaves as plants age or face nutrient stress. During grain filling, cereal crops depend heavily on flag leaves to continue producing carbohydrates that are transported into developing seeds. Nitrogen availability and cytokinin signaling can help maintain these leaves for longer, preserving photosynthetic activity at a stage when grain weight is being determined. At the same time, cytokinin metabolism must be carefully controlled. Excessive or poorly timed signaling can disrupt the balance between vegetative growth and reproduction. Enzymes such as CKXs act as important regulators of this balance. Research in rice has shown that altering CKX activity can affect grain number, grain filling and the relationship between carbohydrate-producing leaves and developing grains. Some transport proteins may even carry both sugar and cytokinin, linking the movement of energy and growth signals directly within developing cereal grains.</p>
<p>Nitrogen and cytokinin signaling may also help crops cope with drought, salinity, heat and flooding—stresses that are becoming more consequential as climates change. Nitrate can influence stress-related gene expression, antioxidant defenses and the production of reactive oxygen species, molecules that serve as signals at controlled levels but can damage cells when they accumulate excessively. Cytokinins interact with abscisic acid, the hormone strongly associated with drought responses, as well as with ethylene and other signaling pathways. Under water deficit, changes in cytokinin production and transport can alter the balance between shoot growth and root investment, helping plants conserve resources while continuing to search for water. In some systems, stress-induced cytokinin synthesis has been linked to coordinated regulation of carbon and nitrogen assimilation. Nitrate nutrition has also been associated with improved tolerance to salinity and heat, although the benefits depend on dose, timing, species and environmental conditions. Too much nitrogen can intensify stress by stimulating growth that the plant cannot support with available water.</p>
<p>The authors emphasize that these findings do not justify simply adding hormones or more fertilizer to fields. Cytokinins are powerful regulators, and their effects vary with tissue, developmental stage, nitrate concentration and interactions with other hormones. Instead, the review points toward precision strategies that might match fertilizer placement and timing to the plant’s signaling capacity. Localized fertilizer application could encourage roots to forage in nutrient-rich zones without saturating the entire soil profile. Breeding or gene editing might target nitrate sensors, cytokinin transporters, IPT biosynthetic enzymes or CKX catabolic enzymes to create crops that maintain productivity with less nitrogen. Beneficial soil microbes that produce or modify cytokinins could provide another route, particularly under drought or nutrient stress, although field performance remains difficult to predict. The central message is that future high-efficiency crops may be designed not only to absorb more nitrate, but to make better decisions about when, where and why to use it. By treating nitrate as both food and information, agriculture could move closer to producing more grain with less fertilizer—and make the plant’s own communication network part of the solution.</p>
<p><strong>Subject of Research:</strong> Interaction between nitrate signaling and cytokinin hormones in plant nitrogen-use efficiency, growth, stress resistance and crop productivity</p>
<p><strong>Article Title:</strong> Interaction between nitrates and cytokinins in the regulation of nitrogen use efficiency, plant growth, abiotic stress resistance and productivity</p>
<p><strong>Article References:</strong> Veselov, D., Zhao, J., Korobova, A. et al. “Interaction between nitrates and cytokinins in the regulation of nitrogen use efficiency, plant growth, abiotic stress resistance and productivity.” <em>Plant and Soil</em> (2026). <a href="https://doi.org/10.1007/s11104-026-09011-7">Original research page</a></p>
<p><strong>Image Credits:</strong> AI Generated</p>
<p><strong>DOI:</strong> 10.1007/s11104-026-09011-7</p>
<p><strong>Keywords:</strong> nitrate uptake, nitrogen-use efficiency, cytokinin signaling, cytokinin transporters, root architecture, crop productivity, drought resistance, cereal grain filling</p>
]]></content:encoded>
					
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">182537</post-id>	</item>
		<item>
		<title>Plant Phosphatase BSL1 Drives Mitotic Entry</title>
		<link>https://scienmag.com/plant-phosphatase-bsl1-drives-mitotic-entry/</link>
		
		<dc:creator><![CDATA[Drew Townsend]]></dc:creator>
		<pubDate>Thu, 13 Nov 2025 13:50:31 +0000</pubDate>
				<category><![CDATA[Biology]]></category>
		<category><![CDATA[bsl1-1 mutant cell analysis]]></category>
		<category><![CDATA[CDKB1 phosphorylation sites]]></category>
		<category><![CDATA[cell division progression in plants]]></category>
		<category><![CDATA[cyclin-dependent kinase B1 activation]]></category>
		<category><![CDATA[global quantitative phosphoproteomics]]></category>
		<category><![CDATA[microscopy and mass spectrometry in cell biology]]></category>
		<category><![CDATA[mitotic entry mechanisms in plants]]></category>
		<category><![CDATA[phosphatase BSL1 function]]></category>
		<category><![CDATA[phosphorylation dynamics in plants]]></category>
		<category><![CDATA[plant cell cycle regulation]]></category>
		<category><![CDATA[plant growth and development]]></category>
		<category><![CDATA[S phase and mitotic proteins]]></category>
		<guid isPermaLink="false">https://scienmag.com/plant-phosphatase-bsl1-drives-mitotic-entry/</guid>

					<description><![CDATA[In a groundbreaking advance in cell cycle biology, researchers have unveiled how the plant-specific phosphatase BSL1 orchestrates mitotic entry by directly targeting cyclin-dependent kinase B1 (CDKB1) phosphorylation sites. This discovery illuminates a fundamental regulatory mechanism underpinning cell division control in plants and could have far-reaching implications for understanding growth and development across the green lineage. [&#8230;]]]></description>
										<content:encoded><![CDATA[<p>In a groundbreaking advance in cell cycle biology, researchers have unveiled how the plant-specific phosphatase BSL1 orchestrates mitotic entry by directly targeting cyclin-dependent kinase B1 (CDKB1) phosphorylation sites. This discovery illuminates a fundamental regulatory mechanism underpinning cell division control in plants and could have far-reaching implications for understanding growth and development across the green lineage.</p>
<p>Cell division progression hinges critically on the timely activation and deactivation of cyclin-dependent kinases (CDKs), enzymes that coordinate cell cycle transitions through phosphorylation. In plants, CDKB1 plays a pivotal role, yet the regulatory phosphatases responsible for resetting CDKB1 activity had remained elusive. Through a cutting-edge global quantitative phosphoproteomics approach, the research team dissected phosphorylation dynamics in synchronized wild-type and mutant bsl1-1 cells at four meticulously chosen cell cycle stages: newborn cells, mid-G1, early S/M, and mid S/M.</p>
<p>Microscopy revealed bsl1-1 mutant cells undergo delayed division, corroborated by mass spectrometry data showing accumulation of S phase and mitotic hallmark proteins such as MCM3, RIR1, CDKA, CYCB1, and CDKB1 at later timepoints. Intriguingly, CDKB1 phosphorylation at threonine 14 (Thr14) and tyrosine 15 (Tyr15) was markedly elevated in the mutant at 8 and 10 hours, indicating BSL1’s role as a critical phosphatase targeting these sites.</p>
<p>Employing parallel reaction monitoring mass spectrometry, the researchers demonstrated a 30- to 60-fold increase in the doubly phosphorylated CDKB1 peptide harboring pThr14 and pTyr15 modifications within bsl1-1 cells relative to wild type. This contrasted sharply with a moderate twofold increase in the singly phosphorylated pTyr15 form, underscoring BSL1’s specificity in dephosphorylating both residues. Control peptides from proteins like PEPC2 and CDPKK exhibited no significant phosphorylation changes, pointing to the selectivity of BSL1-mediated dephosphorylation.</p>
<p>In established model organisms including yeast and animals, phosphorylation of the CDK catalytic subunit on Thr14 and Tyr15 is a canonical response to DNA replication stress, halting the cell cycle to maintain genome integrity. Exploiting this conceptual framework, the team induced replication stress in Chlamydomonas cells using hydroxyurea (HU), a ribonucleotide reductase inhibitor. HU treatment intensified CDKB1 phosphorylation without altering total protein abundance, mirroring stress-activated checkpoint phenomena known in other eukaryotes.</p>
<p>To parse the biochemical activity of BSL1, the investigators immunoprecipitated CDKB1 fused with a fluorescent mCherry tag from HU-treated cells and incubated it with recombinant BSL1 phosphatase domains. The pronounced reduction in phosphorylated CDKB1 species after treatment — comparable to the effect of lambda phosphatase and greater than that observed with Toxoplasma gondii PPKL — established BSL1 as a direct and efficient CDKB1 phosphatase. Negative controls, including buffer alone or unrelated proteins, failed to elicit such dephosphorylation, affirming assay specificity.</p>
<p>Further biophysical analysis via bio-layer interferometry uncovered a direct physical interaction between recombinant GST-tagged CDKB1 and purified BSL1, with a dissociation constant (K_d) of approximately 900 nM. This nanomolar affinity interaction strengthens the model wherein BSL1 engages its CDKB1 substrate in vivo, facilitating precise modulation of CDKB1 phosphorylation state and functional activity.</p>
<p>Confocal microscopy provided compelling spatial insight, demonstrating that BSL1 and CDKB1 colocalize near spindle poles during metaphase. Such subcellular localization is consistent with the previously reported spindle pole enrichment of CYCB1—a key cyclin partner of CDKB1—suggesting a coordinated regulatory complex modulating mitosis at the microtubule organizing centers.</p>
<p>The team also engineered a CDKB1 mutant variant harboring non-phosphorylatable alanine and phenylalanine substitutions at Thr14 and Tyr15, respectively. This CDKB1(AF) construct abolished phosphorylation signals upon HU exposure, confirming these residues as critical regulatory phosphorylation sites controllable by BSL1. Parallel proximity labeling experiments using the BSL1–BioIDG3 fusion protein revealed an enrichment of CYCB1 labeling, implicating BSL1 within a broader mitotic complex that integrates cyclin and kinase signaling pathways.</p>
<p>Taken together, these comprehensive in vivo and in vitro data compellingly position BSL1 as an indispensable phosphatase directing the removal of inhibitory phosphate marks on CDKB1 to promote mitotic entry in plant cells. The intricate temporal control of CDKB1 phosphorylation by BSL1 ensures proper cell cycle progression and faithful chromosome segregation.</p>
<p>This discovery opens new avenues for manipulating plant growth and cell division, with implications for agriculture, bioengineering, and synthetic biology. By decoding how cyclin-dependent kinase activity is finely tuned through specific phosphatase action, scientists gain a powerful tool for modulating developmental timing, stress responses, and tissue regeneration in crops.</p>
<p>Moreover, the findings resonate beyond plants, as phosphorylation-dependent regulation of CDKs is a conserved feature across eukaryotes. Comparative analyses can now explore whether functionally analogous phosphatases operate in other kingdoms, potentially enriching our understanding of mitotic regulation and cell cycle checkpoints universally.</p>
<p>Future research can build on this work to elucidate the regulatory networks upstream of BSL1 that control its activity and subcellular localization, as well as downstream consequences on mitotic machinery and genome stability. Understanding how environmental signals and cellular stress integrate with phosphatase-mediated CDK control will deepen insight into plant adaptability and resilience.</p>
<p>The elegant combination of phosphoproteomics, molecular genetics, live-cell imaging, biochemical assays, and biophysical techniques exemplifies a multidisciplinary approach at the forefront of cell biology research. This integrative methodology serves as a blueprint for dissecting complex regulatory mechanisms in diverse biological systems.</p>
<p>In sum, the revelation that BSL1 dephosphorylates CDKB1 at Thr14 and Tyr15 represents a critical advance in unraveling plant-specific controls of cell division. This study not only fills a pivotal knowledge gap but also sets the stage for transformative applications in plant science and beyond.</p>
<p>Subject of Research:<br />
The study investigates the regulation of mitotic entry in plants by elucidating the role of the plant-specific phosphatase BSL1 in dephosphorylating cyclin-dependent kinase B1 (CDKB1) at key inhibitory sites.</p>
<p>Article Title:<br />
Mitotic entry is controlled by the plant-specific phosphatase BSL1 and cyclin-dependent kinase B.</p>
<p>Article References:<br />
Tulin, F., Aizezi, Y., Reyes, A.V. et al. Mitotic entry is controlled by the plant-specific phosphatase BSL1 and cyclin-dependent kinase B. Nat. Plants (2025). https://doi.org/10.1038/s41477-025-02145-z</p>
<p>DOI:<br />
https://doi.org/10.1038/s41477-025-02145-z</p>
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		<title>OfGATA9 Boosts Flower Size in Sweet Osmanthus</title>
		<link>https://scienmag.com/ofgata9-boosts-flower-size-in-sweet-osmanthus/</link>
		
		<dc:creator><![CDATA[Juliet Wilcox]]></dc:creator>
		<pubDate>Fri, 03 Oct 2025 07:32:17 +0000</pubDate>
				<category><![CDATA[Biology]]></category>
		<category><![CDATA[floral aesthetics and market value]]></category>
		<category><![CDATA[flower development mechanisms]]></category>
		<category><![CDATA[GATA family transcription factors]]></category>
		<category><![CDATA[gene expression regulation in plants]]></category>
		<category><![CDATA[genetic manipulation in horticulture]]></category>
		<category><![CDATA[horticultural traits enhancement]]></category>
		<category><![CDATA[OfGATA9 transcription factor]]></category>
		<category><![CDATA[ornamental plant genetics]]></category>
		<category><![CDATA[plant growth and development]]></category>
		<category><![CDATA[research in ornamental horticulture]]></category>
		<category><![CDATA[sweet osmanthus flower size]]></category>
		<category><![CDATA[transcription factors in plant physiology]]></category>
		<guid isPermaLink="false">https://scienmag.com/ofgata9-boosts-flower-size-in-sweet-osmanthus/</guid>

					<description><![CDATA[In a groundbreaking study published in BMC Genomics, a team of researchers led by Wang et al. have unveiled the significant role of the GATA transcription factor OfGATA9 in regulating flower size in sweet osmanthus (Osmanthus fragrans). This research holds promise for enhancing ornamental plant traits, alongside offering insights into the underlying genetic mechanisms of [&#8230;]]]></description>
										<content:encoded><![CDATA[<p>In a groundbreaking study published in BMC Genomics, a team of researchers led by Wang et al. have unveiled the significant role of the GATA transcription factor OfGATA9 in regulating flower size in sweet osmanthus (Osmanthus fragrans). This research holds promise for enhancing ornamental plant traits, alongside offering insights into the underlying genetic mechanisms of flower development. The findings are particularly relevant in the context of horticulture, where flower size can significantly influence aesthetic appeal and market value.</p>
<p>Transcription factors are vital proteins that govern the expression of genes, orchestrating the plant&#8217;s growth and developmental processes. Among various transcription factors, GATA family members have been recognized for their roles in numerous physiological responses in plants. This study meticulously examined the specific GATA factor, OfGATA9, and its interaction with gene expression during flowering. By understanding the function of OfGATA9, the researchers aimed to shed light on the complexities of flower development in sweet osmanthus.</p>
<p>Through a series of experiments using genetic manipulation techniques, the researchers demonstrated that the overexpression of OfGATA9 in sweet osmanthus significantly increased flower size compared to control plants. This correlation suggests that OfGATA9 not only impacts the physical traits of flowers but could also be pivotal in the overall reproductive success of the plant species. There is a strong link between flower size and pollinator attraction, which is crucial for the plant&#8217;s propagation.</p>
<p>Molecular analyses conducted in the study illustrated that OfGATA9 operates by activating downstream target genes involved in flower development. The team utilized RNA sequencing data to identify these target genes, revealing a comprehensive network influenced by OfGATA9. Interestingly, the identified genes were associated with various pathways, including those responsible for cell growth and hormone signaling, suggesting a multilayered regulatory mechanism at play.</p>
<p>In the context of urban horticulture, the findings of this research are particularly significant. With increasing demand for ornamental plants that offer not only aesthetic beauty but also resilience against environmental stressors, understanding the genetic basis of flower size can contribute to breeding programs aimed at producing superior cultivars. The ability to manipulate flower size through specific gene expression can lead to innovations in urban landscaping and floral design.</p>
<p>Moreover, cultivating awareness regarding the genetic basis of ornamental traits paves the way for sustainable horticulture practices. By utilizing genetic insights, horticulturists can enhance desirable traits in flowers while minimizing the need for chemical interventions. This aligns with the broader goals of sustainable agriculture, where genetic approaches can reduce dependencies on pesticides and fertilizers, promoting ecosystem health.</p>
<p>The implications of the study extend beyond ornamental horticulture. Floral traits play a vital role in plant ecology, influencing interactions with pollinators and other species. With the ongoing global decline in pollinator populations, enhancing flower traits through genetic research could be a strategic approach to support ecological balance. Understanding how to attract beneficial insects through flower size and structure will undoubtedly aid in conservation efforts.</p>
<p>While the current findings centered on sweet osmanthus, the broader applicability of GATA transcription factors suggests that similar regulatory mechanisms could be present in other flowering plants. This opens up new avenues for research into various species, enhancing our understanding of plant development on a wider scale. Indeed, the potential for cross-species genetic studies is enticing, with the possibility of uncovering universal principles governing flower size and growth.</p>
<p>As the research community continues to delve deeper into plant genomics, the work of Wang et al. stands out as a significant contribution. It highlights not only the complexity of flower development but also the innovative approaches that can be employed to enhance plant traits. Such knowledge will undoubtedly drive forward the fields of genomics, horticulture, and even ecological conservation.</p>
<p>In conclusion, the exploration of OfGATA9’s role in flower size regulation represents a milestone in plant genetic research. The multifaceted approach taken by the researchers, combining molecular biology, genetics, and ecology, promises to enrich our understanding of plant development and evolution. Moving forward, the integration of these findings into practical applications in horticulture and conservation could usher in a new era for ornamental plants, ensuring they thrive both in gardens and natural ecosystems.</p>
<p>The culmination of this research, as documented in the comprehensive study from Wang and colleagues, undoubtedly sets the stage for future explorations. As we harness the power of genetic discovery relating to plant traits, we move closer to a future where science and nature coexist harmoniously, benefiting both plants and the environments they inhabit.</p>
<hr />
<p><strong>Subject of Research</strong>: GATA transcription factor OfGATA9 and its role in flower size regulation in sweet osmanthus.</p>
<p><strong>Article Title</strong>: A GATA transcription factor OfGATA9 positively regulates flower size of sweet osmanthus.</p>
<p><strong>Article References</strong>: Wang, Y., Peng, L., Chen, Q. <em>et al.</em> A GATA transcription factor OfGATA9 positively regulates flower size of sweet osmanthus. <em>BMC Genomics</em> <strong>26</strong>, 859 (2025). <a href="https://doi.org/10.1186/s12864-025-12073-z">https://doi.org/10.1186/s12864-025-12073-z</a></p>
<p><strong>Image Credits</strong>: AI Generated</p>
<p><strong>DOI</strong>: 10.1186/s12864-025-12073-z</p>
<p><strong>Keywords</strong>: GATA transcription factor, floral development, plant genetics, sweet osmanthus, ornamental horticulture, flower size regulation, genetic manipulation, sustainable agriculture.</p>
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