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Antagonistic interaction between jasmonic acid and cytokinin in xylem development
Geupil Jang1, Sun Hyun Chang1, Tae Young Um1
1Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, 151-921, Korea.
Scientific Reports
|September 2, 2017
Summary
The stress hormone jasmonic acid (JA) promotes extra xylem growth in Arabidopsis roots. This process involves JA suppressing cytokinin responses, regulated by the transcription factor MYC2.
Area of Science:
- Plant Biology
- Plant Physiology
- Developmental Biology
Background:
- Plant development is influenced by stress hormones.
- Hormonal crosstalk is crucial for developmental plasticity under stress.
Purpose of the Study:
- To investigate the role of jasmonic acid (JA) in root xylem development.
- To elucidate the molecular mechanism by which JA regulates xylem formation, focusing on its interaction with cytokinin.
Main Methods:
- Utilized wild-type and mutant Arabidopsis thaliana lines (JA signaling, JA biosynthesis, MYC2, AHP6).
- Applied JA treatments and exogenous cytokinin.
- Performed time-course experiments to analyze hormonal response dynamics.
- Investigated gene expression related to JA and cytokinin signaling pathways.
Main Results:
- Jasmonic acid (JA) treatment induced the formation of extra xylem in wild-type Arabidopsis roots.
- JA signaling mutants showed impaired JA-induced xylem formation, while JA biosynthesis mutants did not.
- JA treatment reduced cytokinin responses in the vasculature.
- Exogenous cytokinin counteracted the JA-mediated xylem phenotype.
- The JA-responsive transcription factor MYC2 was found to regulate AHP6 expression, which is involved in the JA-mediated xylem phenotype.
Conclusions:
- The JA response positively regulates xylem development in Arabidopsis roots.
- JA-induced xylem formation is mediated by the suppression of cytokinin responses.
- The transcription factor MYC2 and AHP6 play key roles in the JA-mediated regulation of xylem development.
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