Document Detail

A Molecular Framework of Light-Controlled Phytohormone Action in Arabidopsis.
MedLine Citation:
PMID:  22818915     Owner:  NLM     Status:  Publisher    
Environmental changes strongly affect plant growth and development. Phytohormones, endogenous plant-made small molecules such as ethylene, regulate a wide range of processes throughout the lifetime of plants [1, 2]. The ability of plants to integrate external signals with endogenous regulatory pathways is vital for their survival [3, 4]. Ethylene has been found to suppress hypocotyl elongation in darkness [5] while promoting it in light [6, 7]. How ethylene regulates hypocotyl elongation in such opposite ways is largely unknown. In particular, how light modulates and even reverses the function of ethylene has yet to be characterized. Here we show that the basic-helix-loop-helix transcription factor phytochrome-interacting factor 3 (PIF3) is directly activated by ETHYLENE-INSENSITIVE 3 (EIN3) and is indispensible for ethylene-induced hypocotyl elongation in light. Ethylene via EIN3 concomitantly activates two contrasting pathways: the PIF3-dependent growth-promoting pathway and an ethylene response factor 1 (ERF1)-mediated growth-inhibiting pathway. In the light, growth-promoting PIFs are limiting due to light-dependent destabilization, and thus ethylene stimulates growth under these conditions. In contrast, ERF1 is destabilized, and thus limiting, under dark conditions, explaining why ethylene inhibits growth in the dark. Our findings provide a mechanistic insight into how light modulates internal hormone-regulated plant growth.
Shangwei Zhong; Hui Shi; Chang Xue; Lei Wang; Yanpeng Xi; Jigang Li; Peter H Quail; Xing Wang Deng; Hongwei Guo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-19
Journal Detail:
Title:  Current biology : CB     Volume:  -     ISSN:  1879-0445     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9107782     Medline TA:  Curr Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Peking-Yale Joint Center for Plant Molecular Genetics and Agro-Biotechnology and State Key Laboratory of Protein and Plant Gene Research, College of Life Sciences, Peking University, Beijing 100871, China; Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06520, USA.
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