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The cold response regulator CBF1 promotes Arabidopsis hypocotyl growth at ambient temperatures
Author(s) -
Dong Xiaojing,
Yan Yan,
Jiang Bochen,
Shi Yiting,
Jia Yuxin,
Cheng Jinkui,
Shi Yihao,
Kang Juqing,
Li Hong,
Zhang Dun,
Qi Lijuan,
Han Run,
Zhang Shaoman,
Zhou Yangyang,
Wang Xiaoji,
Terzaghi William,
Gu Hongya,
Kang Dingming,
Yang Shuhua,
Li Jigang
Publication year - 2020
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.15252/embj.2019103630
Subject(s) - hypocotyl , biology , arabidopsis , regulator , plant growth , growth regulator , botany , microbiology and biotechnology , biochemistry , gene , mutant
Light and temperature are two core environmental factors that coordinately regulate plant growth and survival throughout their entire life cycle. However, the mechanisms integrating light and temperature signaling pathways in plants remain poorly understood. Here, we report that CBF 1, an AP 2/ ERF ‐family transcription factor essential for plant cold acclimation, promotes hypocotyl growth under ambient temperatures in Arabidopsis . We show that CBF 1 increases the protein abundance of PIF 4 and PIF 5, two phytochrome‐interacting bHLH ‐family transcription factors that play pivotal roles in modulating plant growth and development, by directly binding to their promoters to induce their gene expression, and by inhibiting their interaction with phyB in the light. Moreover, our data demonstrate that CBF 1 promotes PIF 4/ PIF 5 protein accumulation and hypocotyl growth at both 22°C and 17°C, but not at 4°C, with a more prominent role at 17°C than at 22°C. Together, our study reveals that CBF 1 integrates light and temperature control of hypocotyl growth by promoting PIF 4 and PIF 5 protein abundance in the light, thus providing insights into the integration mechanisms of light and temperature signaling pathways in plants.