S-Space College of Agriculture and Life Sciences (농업생명과학대학) Dept. of Plant Science (식물생산과학부) Journal Papers (저널논문_식물생산과학부)
Phytochrome-interacting transcription factors PIF4 and PIF5 induce leaf senescence in Arabidopsis
- Sakuraba, Yasuhito; Jeong, Jinkil; Kang, Min-Young; Kim, Junghyun; Paek, Nam-Chon; Choi, Giltsu
- Issue Date
- Nature Publishing Group
- Nature Communications, Vol.5 No.8, pp. 4636-4649
- Plants initiate senescence to shed photosynthetically inefficient leaves. Light deprivationinduces leaf senescence, which involves massive transcriptional reprogramming to dismantlecellular components and remobilize nutrients. In darkness, intermittent pulses of red light caninhibit senescence, likely via phytochromes. However, the precise molecular mechanismstransducing the signals from light perception to the inhibition of senescence remain elusive.Here, we show that in Arabidopsis, dark-induced senescence requires phytochrome-interactingtranscription factors PIF4 and PIF5 (PIF4/PIF5). ELF3 and phytochrome B inhibitsenescence by repressing PIF4/PIF5 at the transcriptional and post-translational levels,respectively. PIF4/PIF5 act in the signalling pathways of two senescence-promotinghormones, ethylene and abscisic acid, by directly activating expression of EIN3, ABI5 and EEL.In turn, PIF4, PIF5, EIN3, ABI5 and EEL directly activate the expression of the majorsenescence-promoting NAC transcription factor ORESARA1, thus forming multiple, coherentfeed-forward loops. Our results reveal how classical light signalling connects to senescence inArabidopsis.
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