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Kim, Sunji
식물 노화·수명 연구단
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High Ambient Temperature Accelerates Leaf Senescence via PHYTOCHROME-INTERACTING FACTOR 4 and 5 in Arabidopsis

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Title
High Ambient Temperature Accelerates Leaf Senescence via PHYTOCHROME-INTERACTING FACTOR 4 and 5 in Arabidopsis
Author(s)
Chanhee Kim; Sun Ji Kim; Jinkil Jeong; Eunae Park; Eunkyoo Oh; Youn-Il Park; Pyung Ok Lim; Giltsu Choi
Subject
Arabidopsis, ; phytochrome, ; PIF4, ; senescence, ; temperature
Publication Date
2020-07
Journal
MOLECULES AND CELLS, v.43, no.7, pp.645 - 661
Publisher
KOREAN SOC MOLECULAR & CELLULAR BIOLOGY
Abstract
©The Korean Society for Molecular and Cellular Biology. 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
URI
https://pr.ibs.re.kr/handle/8788114/7757
DOI
10.14348/molcells.2020.0117
ISSN
1016-8478
Appears in Collections:
Center for Plant Aging Research (식물 노화·수명 연구단) > 1. Journal Papers (저널논문)
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