ABA receptor PYL9 promotes drought resistance and leaf senescence

	ABA receptor PYL9 promotes drought resistance and leaf senescence
	Zhao, Yang ; Chan, Zhulong ; Gao, Jinghui ; Xing, Lu ; Cao, Minjie ; Yu, Chunmei ; Hu, Yuanlei ; You, Jun ; Shi, Haitao ; Zhu, Yingfang ; Gong, Yuehua ; Mu, Zixin ; Wang, Haiqing ; Deng, Xin ; Wang, Pengcheng ; Bressan, Ray A. ; Zhu, Jian-Kang
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2016-02-16
英文摘要	Drought stress is an important environmental factor limiting plant productivity. In this study, we screened drought-resistant transgenic plants from 65 promoter-pyrabactin resistance 1-like (PYL) abscisic acid (ABA) receptor gene combinations and discovered that pRD29A::PYL9 transgenic lines showed dramatically increased drought resistance and drought-induced leaf senescence in both Arabidopsis and rice. Previous studies suggested that ABA promotes senescence by causing ethylene production. However, we found that ABA promotes leaf senescence in an ethylene-independent manner by activating sucrose nonfermenting 1-related protein kinase 2s (SnRK2s), which subsequently phosphorylate ABA-responsive element-binding factors (ABFs) and Related to ABA-Insensitive 3/VP1 (RAV1) transcription factors. The phosphorylated ABFs and RAV1 up-regulate the expression of senescence-associated genes, partly by up-regulating the expression of Oresara 1. The pyl9 and ABA-insensitive 1-1 single mutants, pyl8-1pyl9 double mutant, and snrk2.2/3/6 triple mutant showed reduced ABA-induced leaf senescence relative to the WT, whereas pRD29A::PYL9 transgenic plants showed enhanced ABA-induced leaf senescence. We found that leaf senescence may benefit drought resistance by helping to generate an osmotic potential gradient, which is increased in pRD29A::PYL9 transgenic plants and causes water to preferentially flow to developing tissues. Our results uncover the molecular mechanism of ABA-induced leaf senescence and suggest an important role of PYL9 and leaf senescence in promoting resistance to extreme drought stress.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/5775]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Zhao, Yang,Chan, Zhulong,Gao, Jinghui,et al. ABA receptor PYL9 promotes drought resistance and leaf senescence[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2016.
APA	Zhao, Yang.,Chan, Zhulong.,Gao, Jinghui.,Xing, Lu.,Cao, Minjie.,...&Zhu, Jian-Kang.(2016).ABA receptor PYL9 promotes drought resistance and leaf senescence.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA.
MLA	Zhao, Yang,et al."ABA receptor PYL9 promotes drought resistance and leaf senescence".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2016).