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Green light mediates atypical photomorphogenesis by dual modulation of Arabidopsis phytochromes B and A

JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2024年第9期66卷 1915-1933页

作者： Xu, Miqi Wang, Yi-Yuan Wu, Yujie Zhou, Xiuhong Shan, Ziyan Tao, Kunying Qian, Kaiqiang Wang, Xuncheng Li, Jian Wu, Qingqing Deng, Xing Wang Ling, Jun-Jie Anhui Agr Univ Sch Life Sci Natl Engn Lab Crop Stress Resistance Breeding Hefei 230036 Peoples R China Anhui Agr Univ Sch Life Sci Prov Key Lab Resource Insect Biol & Innovat Utiliz Hefei 230036 Peoples R China Anhui Agr Univ Biotechnol Ctr Sch Tea & Food Sci & Technol State Key Lab Tea Plant Biol & Utilizat Hefei 230036 Peoples R China Beijing Acad Agr & Forestry Sci Inst Plant & Environm Protect Beijing Key Lab Environm Friendly Management Fruit Beijing 100097 Peoples R China Nanjing Normal Univ Coll Life Sci Nanjing 210023 Peoples R China Peking Univ Peking Tsinghua Ctr Life Sci Sch Adv Agr Sci State Key Lab Prot & Plant Gene Res Beijing 100871 Peoples R China Peking Univ Sch Life Sci Beijing 100871 Peoples R China Peking Univ Inst Adv Agr Sci State Key Lab Wheat Improvement Shandong Lab Adv Agr Sci Weifang Weifang 261000 Peoples R China

Although green light (GL) is located in the middle of the visible light spectrum and regulates a series of plant developmental processes, the mechanism by which it regulates seedling development is largely unknown. In this study, we demonstrated that GL promotes atypical photomorphogenesis in Arabidopsis thaliana via the dual regulations of phytochrome B (phyB) and phyA. Although the Pr-to-Pfr conversion rates of phyB and phyA under GL were lower than those under red light (RL) in a fluence rate-dependent and time-dependent manner, long-term treatment with GL induced high Pfr/Pr ratios of phyB and phyA. Moreover, GL induced the formation of numerous small phyB photobodies in the nucleus, resulting in atypical photomorphogenesis, with smaller cotyledon opening angles and longer hypocotyls in seedlings compared to RL. The abundance of phyA significantly decreased after short- and long-term GL treatments. We determined that four major PHYTOCHROME-INTERACTING FACTORs (pifs: pif1, pif3, pif4, and pif5) act downstream of phyB in GL-mediated cotyledon opening. In addition, GL plays opposite roles in regulating different pifs. For example, under continuous GL, the protein levels of all pifs decreased, whereas the transcript levels of pif4 and pif5 strongly increased compared with dark treatment. Taken together, our work provides a detailed molecular framework for understanding the role of the antagonistic regulations of phyB and phyA in GL-mediated atypical photomorphogenesis.

关键词： cotyledon development green light photobody phytochrome pif3 RED-LIGHT pif3 phosphorylation SEED-GERMINATION ACTION SPECTRA DEGRADATION GROWTH PHOTORECEPTORS RESPONSES SHADE PHOTOSYNTHESIS

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