Oil-Tea Gene CoRVE1 Supercharges Drought Survival in Transgenic Plants

When drought strikes, plants do not simply endure it passively; they mount a coordinated molecular defense involving hundreds of genes, signaling molecules, and protective proteins. Researchers in Hunan, China, have now identified a single transcription factor from the oil-tea tree, Camellia oleifera, that appears to act as a master switch for this defense. The gene, named CoRVE1, belongs to the REVEILLE family of transcription factors, a group best known for its role in the plant circadian clock. In a study published in BMC Plant Biology, the team demonstrated that overexpressing CoRVE1 in the model plant Arabidopsis thaliana dramatically enhanced drought tolerance, with survival rates reaching 84% and 86% in two transgenic lines compared with just 20% in wild-type plants.

Camellia oleifera is one of China’s most important woody oil crops, cultivated extensively for its seeds, which yield high-quality edible oil. However, like many crops, its growth and productivity are frequently constrained by drought stress, a challenge that is becoming increasingly severe as climate patterns shift. The REVEILLE family of genes, which includes RVE1, plays crucial roles in plant stress responses, yet their functions in C. oleifera remained largely unexplored before this study. The researchers set out to clone the RVE1 homolog from C. oleifera and investigate whether it contributes to drought tolerance, a question with significant implications for the genetic improvement of woody oil crops.

The team began by cloning CoRVE1 and analyzing its expression patterns under various stress conditions. Expression analyses revealed that CoRVE1 was significantly induced by drought, salt, and abscisic acid (ABA) treatments, indicating that the gene responds to multiple stress signals. ABA is a key plant hormone involved in stress responses, and its involvement suggests that CoRVE1 may be integrated into the ABA-dependent stress signaling pathway. The gene also displayed tissue-specific expression patterns, providing clues about where in the plant it exerts its effects. These findings positioned CoRVE1 as a promising candidate for functional characterization through heterologous overexpression.

To test the gene’s function directly, the researchers overexpressed CoRVE1 in Arabidopsis thaliana, a widely used model plant that allows rapid genetic analysis. The results were striking. Two overexpression lines showed markedly enhanced drought tolerance, with survival rates of 84% and 86% after drought treatment, compared with only 20% in wild-type plants. In detached-leaf water-loss assays, the transgenic lines lost water at a rate of 7.6% and 7.2% after 200 minutes, compared with 9% in the wild type, indicating improved water retention. The overexpression lines also promoted plant growth under stress conditions, suggesting that CoRVE1 does not simply trade growth for survival but supports both.

Physiological analyses provided mechanistic insight into how CoRVE1 enhances drought tolerance. The transgenic lines showed enhanced antioxidant capacity, with increased activities of superoxide dismutase (SOD), peroxidase, and catalase. After 10 days of drought, SOD activity increased by 84.6–85.7% in the transgenic lines, compared with 37.6% in the wild type. These enzymes neutralize reactive oxygen species, which accumulate during drought stress and damage cellular components. Consistent with this protective effect, malondialdehyde accumulation, a marker of oxidative damage to membranes, was reduced by 17–18% under drought stress in the overexpression lines. This reduction indicates that CoRVE1-overexpressing plants suffer less membrane damage when water is scarce.

Beyond antioxidant defense, the transgenic lines showed improved osmotic adjustment, reflected by altered accumulation of proline, soluble sugars, and soluble proteins. Osmotic adjustment is a critical drought-response mechanism in which plants accumulate compatible solutes to maintain cellular water content and turgor pressure under water deficit. Proline, in particular, is a well-known osmoprotectant that stabilizes proteins and membranes while contributing to osmotic balance. The altered accumulation of these solutes in CoRVE1-overexpressing plants suggests that the gene enhances the plant’s ability to maintain physiological function during drought by improving osmotic regulation at the cellular level.

At the molecular level, the researchers found that several drought-responsive genes were significantly upregulated in CoRVE1-overexpressing plants. These included RD29A, RD22, KIN1, COR15A/B, LEA14, LEA76, and CER3, as well as NCED3, a gene involved in ABA biosynthesis. RD29A and RD22 are classic drought-inducible genes whose activation is a hallmark of the plant drought response. LEA proteins, encoded by LEA14 and LEA76, protect cellular structures during dehydration. NCED3 is a rate-limiting enzyme in ABA biosynthesis, and its upregulation suggests that CoRVE1 may enhance ABA accumulation, thereby amplifying the ABA-dependent stress signaling cascade. The coordinated upregulation of this gene network indicates that CoRVE1 acts upstream of multiple drought-response pathways rather than on a single target.

The findings suggest that CoRVE1 positively contributes to drought tolerance by enhancing antioxidant defense and osmotic adjustment and is associated with the upregulation of stress-related genes. This study provides new insights into the drought response of C. oleifera and identifies CoRVE1 as a potential candidate gene for further functional study and genetic improvement of drought resistance in woody oil crops. The research was funded by the Hunan Key Technologies Research and Development Program and the Hunan Provincial Forestry Science and Technology Research and Innovation Fund Project, reflecting regional investment in oil-tea improvement.

For a crop that anchors rural economies across southern China, the identification of a transcription factor that can be engineered to boost drought survival represents a meaningful step toward climate-resilient oil-tea plantations. While the current work was performed in a heterologous system, the strong physiological and molecular evidence positions CoRVE1 as a compelling target for future breeding programs. As drought intensifies across agricultural regions worldwide, genes like CoRVE1 may prove essential tools in the effort to sustain productivity of woody oil crops under increasingly unpredictable conditions.

Subject of Research: Plant Biology

Article Title: Overexpression of Camellia oleifera CoRVE1 enhances drought tolerance in transgenic Arabidopsis thaliana

Article References: Ma, X., He, Z., Yang, D., Zhang, Y., Xun, C., Ma, Y., Wang, R., & Chen, Y. (2026). Overexpression of Camellia oleifera CoRVE1 enhances drought tolerance in transgenic Arabidopsis thaliana. BMC Plant Biology. https://doi.org/10.1186/s12870-026-09866-z

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09866-z

Keywords: drought tolerance, CoRVE1, Camellia oleifera, transcription factor, Arabidopsis thaliana, ABA signaling, antioxidant defense, osmotic adjustment, oil-tea, BMC Plant Biology, Overexpression, Camellia