茉莉酸
氧化脂质
茉莉酸
生物逆境
茉莉酸甲酯
生物化学
非生物成分
脂氧合酶
生物
非生物胁迫
突变体
拟南芥
脱落酸
植物对草食的防御
植物
化学
细胞生物学
水杨酸
酶
生态学
基因
作者
Wiebke Grebner,Nadja Stingl,Ayla Oenel,Martin J. Mueller,Susanne Berger
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2013-02-26
卷期号:161 (4): 2159-2170
被引量:120
标识
DOI:10.1104/pp.113.214544
摘要
Abstract Jasmonates are oxylipin signals that play important roles in the development of fertile flowers and in defense against pathogens and herbivores in leaves. The aim of this work was to understand the synthesis and function of jasmonates in roots. Grafting experiments with a jasmonate-deficient mutant demonstrated that roots produce jasmonates independently of leaves, despite low expression of biosynthetic enzymes. Levels of 12-oxo-phytodienoic acid, jasmonic acid, and its isoleucine derivative increased in roots upon osmotic and drought stress. Wounding resulted in a decrease of preformed 12-oxo-phytodienoic acid concomitant with an increase of jasmonic acid and jasmonoyl-isoleucine. 13-Lipoxygenases catalyze the first step of lipid oxidation leading to jasmonate production. Analysis of 13-lipoxygenase-deficient mutant lines showed that only one of the four 13-lipoxygenases, LOX6, is responsible and essential for stress-induced jasmonate accumulation in roots. In addition, LOX6 was required for production of basal 12-oxo-phytodienoic acid in leaves and roots. Loss-of-function mutants of LOX6 were more attractive to a detritivorous crustacean and more sensitive to drought, indicating that LOX6-derived oxylipins are important for the responses to abiotic and biotic factors.
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