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학술저널
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김찬희 (한국과학기술원) Sun Ji Kim (Center for Plant Aging Research Institute for Basic Science) Jinkil Jeong (Salk Institute for Biological Studies) Eunae Park (KAIST) 오은규 (Korea University) Youn-Il Park (Chungnam National University) 임평옥 (대구경북과학기술원) 최길주 (한국과학기술원)
저널정보
한국분자세포생물학회 Molecules and Cells Molecules and Cells 제43권 제7호
발행연도
2020.1
수록면
645 - 661 (17page)

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Leaf senescence is a developmental process by which a plant actively remobilizes nutrients from aged and photosynthetically inefficient leaves to young growing ones by disassembling organelles and degrading macromolecules. Senescence is accelerated by age and environmental stresses such as prolonged darkness. Phytochrome B (phyB) inhibits leaf senescence by inhibiting phytochrome-interacting factor 4 (PIF4) and PIF5 in prolonged darkness. However, it remains unknown whether phyB mediates the temperature signal that regulates leaf senescence. We found the light-activated form of phyB (Pfr) remains active at least four days after a transfer to darkness at 20°C but is inactivated more rapidly at 28°C. This faster inactivation of Pfr further increases PIF4 protein levels at the higher ambient temperature. In addition, PIF4 mRNA levels rise faster after the transfer to darkness at high ambient temperature via a mechanism that depends on ELF3 but not phyB. Increased PIF4 protein then binds to the ORE1 promoter and activates its expression together with ABA and ethylene signaling, accelerating leaf senescence at high ambient temperature. Our results support a role for the phy-PIF signaling module in integrating not only light signaling but also temperature signaling in the regulation of leaf senescence.

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