How Plant Hormones and Phenolic Acids React to UV-B Stress in Rhododendrons

Greg Howard
29th May, 2024

How Plant Hormones and Phenolic Acids React to UV-B Stress in Rhododendrons

Image Source: Natural Science News, 2024

Key Findings

  • The study focused on Rhododendron chrysanthum, a plant from the Changbai Mountains, known for its resilience to UV-B radiation
  • UV-B exposure increased salicylic acid levels and decreased auxin, jasmonic acid, abscisic acid, cytokinin, and gibberellin in the plant
  • The research identified key phosphorylated proteins involved in hormone signal transduction and phenolic acid biosynthesis, explaining the plant's UV-B tolerance
Rhododendron chrysanthum Pall. (R. chrysanthum) is a resilient plant species that thrives in the harsh environments of the Changbai Mountains. This plant has garnered scientific interest due to its ability to withstand various abiotic stresses, such as UV-B radiation and cold temperatures. A new study conducted by Jilin Normal University aims to elucidate the molecular mechanisms that enable R. chrysanthum leaves to tolerate UV-B exposure[1]. UV-B stress is known to cause significant damage to plant DNA and reduce photosynthetic efficiency, adversely affecting growth and development[2]. The study utilized phosphorylated proteomics and metabolomics to explore the changes in phenolic acids and plant hormones in R. chrysanthum under UV-B stress. The results revealed that UV-B exposure led to an accumulation of salicylic acid and a decrease in auxin, jasmonic acid, abscisic acid (ABA), cytokinin, and gibberellin. Previous research has highlighted the role of ABA in helping plants resist various abiotic stresses, including UV-B radiation, by closing stomata to reduce transpiration loss[2]. The current study expands on this by showing that UV-B stress not only affects ABA levels but also impacts other key plant hormones and phenolic acid compounds, which are crucial for plant stress responses. The study identified several phosphorylated proteins involved in plant hormone signal transduction and phenolic acid biosynthesis pathways. This was achieved by integrating comprehensive metabonomics and phosphorylated proteomics. These findings are consistent with earlier studies that have shown the importance of proteomics in understanding plant stress tolerance[3]. For instance, proteomic analyses have previously identified differentially expressed proteins in R. chrysanthum in response to cold stress, highlighting the role of ABA biosynthesis and signaling in stress responses[4][5]. The current research constructed a regulatory network to illustrate how R. chrysanthum leaves respond to UV-B stress. This network showed the interplay between various plant hormones and phenolic acid compounds, providing a more detailed understanding of the molecular mechanisms underlying radiation tolerance in plants. This builds on earlier findings that identified the synergistic effects of differentially expressed genes and proteins in enhancing cold tolerance in R. chrysanthum[4]. In conclusion, the study by Jilin Normal University offers valuable insights into the complex regulatory mechanisms that enable R. chrysanthum to withstand UV-B stress. By integrating phosphorylated proteomics and metabolomics, the researchers have provided a comprehensive view of how plant hormones and phenolic acids interact to confer radiation tolerance. These findings not only deepen our understanding of plant stress responses but also pave the way for future research aimed at improving the resilience of other plant species to abiotic stresses.

EnvironmentBiochemPlant Science

References

Main Study

1) Plant hormones and phenolic acids response to UV-B stress in Rhododendron chrysanthum pall

Published 28th May, 2024

https://doi.org/10.1186/s13062-024-00483-0

Related Studies

2) Integration of Phosphoproteomics and Transcriptome Studies Reveals ABA Signaling Pathways Regulate UV-B Tolerance in Rhododendron chrysanthum Leaves.

https://doi.org/10.3390/genes14061153

3) Biochemical and proteomics analyses of antioxidant enzymes reveal the potential stress tolerance in Rhododendron chrysanthum Pall.

https://doi.org/10.1186/s13062-017-0181-6

4) Integration of transcriptomic and proteomic analyses of Rhododendron chrysanthum Pall. in response to cold stress in the Changbai Mountains.

https://doi.org/10.1007/s11033-022-08114-5

5) Transcriptome and proteome depth analysis indicate ABA, MAPK cascade and Ca2+ signaling co-regulate cold tolerance in Rhododendron chrysanthum Pall.

https://doi.org/10.3389/fpls.2023.1146663


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