ABA receptor PYL9 promotes drought resistance and leaf senescence

Zhao Yang; Chan Zhulong; Gao JinghuiXing LuCao MinjieYu ChunmeiHu YuanleiYou JunShi HaitaoZhu YingfangGong YuehuaMu ZixinWang HaiqingDeng XinWang PengchengBressan Ray A.Zhu Jian-Kang

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ABA receptor PYL9 promotes drought resistance and leaf senescence

机译：ABA receptor PYL9 promotes drought resistance and leaf senescence

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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.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2016年第7期|1949-1954|共6页
作者
Zhao Yang; Chan Zhulong; Gao JinghuiXing LuCao MinjieYu ChunmeiHu YuanleiYou JunShi HaitaoZhu YingfangGong YuehuaMu ZixinWang HaiqingDeng XinWang PengchengBressan Ray A.Zhu Jian-Kang;
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作者单位

Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA;

Chinese Acad Sci, Sino Africa Joint Res Ctr, Wuhan Bot Garden, Key Lab Plant Germplasm Enhancement & Specialty A, Wuhan 430074, Peoples R China;

Chinese Acad Sci, Shanghai Inst Biol Sci, Shanghai Ctr Plant Stress Biol, Shanghai 200032, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
drought stress; abscisic acid; PYL; dormancy; Arabidopsis;

ABA receptor PYL9 promotes drought resistance and leaf senescence

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