Abstract
Light acts as the pivotal external environment cue to modulate plant growth and development. Seeds germinate in the soil without light to undergo skotomorphogenesis with rapidly elongating hypocotyls that facilitate emergence from the soil, while seedlings upon light exposure undergo photomorphogenesis with significantly inhibited hypocotyl elongation that benefits plants to stand up firmly and cope with the changing environment. In this study, we demonstrate that light promotes jasmonate (JA) biosynthesis to inhibit hypocotyl elongation and orchestrate seedling photomorphogenesis in Arabidopsis. We showed that JAinhibition on hypocotyl elongation is dependent on JA receptor COI1 and signaling components such as repressor proteins JAZs and transcription activators MYC2/MYC3/MYC4. Furthermore, we found that MYC2/MYC3/MYC4 activate the expression of photomorphogenesis regulator HY5 to repress cell elongation-related genes (such as SAUR62 and EXP2) essential for seedling photomorphogenesis. Our findings provide a novel insight into molecular mechanisms underlying how plants integrate light signal with hormone pathway to establish seedling photomorphogenesis.
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Acknowledgements
We thank Dr. Deng X.W. (Peking University) for providing hy5-205, pifq mutant seeds; Dr. Yang H.Q. (Fudan University) for providing cry1/2, phyB-9, phyA-211 mutant seeds; and Lu Meng, Dr. Ran Du for their technical support. This work was supported by the National Key R&D Program of China (2016YFA0500501) and National Natural Science Foundation of China (31630085).
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Yi, R., Yan, J. & Xie, D. Light promotes jasmonate biosynthesis to regulate photomorphogenesis in Arabidopsis. Sci. China Life Sci. 63, 943–952 (2020). https://doi.org/10.1007/s11427-019-1584-4
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DOI: https://doi.org/10.1007/s11427-019-1584-4