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Home Science News Agriculture

A new study reveals key role of plant-bacteria communication for the assembly of a healthy plant microbiome supporting sustainable plant nutrition

May 23, 2024
in Agriculture
Reading Time: 3 mins read
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Nitrogen nutrition and signaling during root nodule symbiosis
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The results in Nature Communications find that symbiotic, nitrogen-fixing bacteria can ensure dominance among soil microbes due to its signalling-based communication with the legume plant host. Researchers discovered that when legumes need nitrogen, they will send out from the roots and into the soil specific molecules that are in turn recognized by the symbiotic bacteria to produce another molecule, the Nod factor which is recognized back by the legume plant. When this mutual recognition was established, the plant will modify the panel of root secreted molecules and by this will affect which soil bacteria can grow in the vicinity of their roots.

Nitrogen nutrition and signaling during root nodule symbiosis

Credit: From Ke Tao et al. 2024)

The results in Nature Communications find that symbiotic, nitrogen-fixing bacteria can ensure dominance among soil microbes due to its signalling-based communication with the legume plant host. Researchers discovered that when legumes need nitrogen, they will send out from the roots and into the soil specific molecules that are in turn recognized by the symbiotic bacteria to produce another molecule, the Nod factor which is recognized back by the legume plant. When this mutual recognition was established, the plant will modify the panel of root secreted molecules and by this will affect which soil bacteria can grow in the vicinity of their roots.

Plants like legumes have a special relationship with certain bacteria in the soil. These bacteria help the plants grow in soil that does not have much nitrogen by converting nitrogen from the air into a usable form. Depending on the nitrogen available in the soil, legume plants can be in different states: lacking nitrogen, in a partnership with the bacteria, or using nitrogen from inorganic sources like nitrate.

The symbiosis with nitrogen-fixing bacteria was shown before to affect the rest of microorganisms living around the plant roots. However, it is not always clear how this partnership affects other microbes, and whether it depends on how much nitrogen the plant has.

In the new study, the team found that the communities of bacteria around the roots and in the surrounding soil differ depending on and have predictive power of the plant’s nitrogen status. Moreover, it was found that signalling exchange between legume and its symbiont plays a critical role in modulating the profile of root secreted molecules, influencing the assembly of a symbiotic root microbiome.

The results provide valuable insights into the complex interplay between nitrogen nutrition, Nod factor signaling, and root microbiome assembly. The findings emphasize the importance of symbiosis and nitrogen nutrition in shaping plant-bacteria interactions, offering potential applications in agriculture and sustainable plant growth.

This is a clear example of interdisciplinary research, where the expertise in chemistry from Associate Prof. Dr. Marianne Glasius to analyze root exudates, in mathematics from Prof. Dr. Rasmus Waagepetersen to develop predictive models, and plant genetics and microbiome from Prof. Dr. Simona Radutoiu enabled complex causational studies of root-associated bacterial communities. By integrating these diverse fields, the researchers were able to answer key questions about how nitrogen nutrition and symbiosis influence plant-bacteria interactions, providing valuable insights for sustainable agriculture.



Journal

Nature Communications

DOI

10.1038/s41467-024-47752-0

Method of Research

Experimental study

Subject of Research

Cells

Article Title

Nitrogen and Nod factor signaling determine Lotus japonicus root exudate composition and bacterial assembly

Article Publication Date

23-Apr-2024

COI Statement

None

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