Differential Impact of Lipoxygenase 2 and Jasmonates on Natural and Stress-Induced Senescence in Arabidopsis

被引：124

作者：

Seltmann, Martin A. ^{[1
]}

Stingl, Nadja E. ^{[1
]}

Lautenschlaeger, Jens K. ^{[1
]}

Krischke, Markus ^{[1
]}

Mueller, Martin J. ^{[1
]}

Berger, Susanne ^{[1
]}

机构：

[1] Univ Wurzburg, Julius von Sachs Inst Biosci, Bioctr, D-97082 Wurzburg, Germany

来源：

PLANT PHYSIOLOGY | 2010年 / 152卷 / 04期

关键词：

INDUCED LEAF SENESCENCE; MALE-STERILE MUTANT; BETA-OXIDATION; ACID BIOSYNTHESIS; METHYL JASMONATE; GENE ENCODES; EXPRESSION; THALIANA; PATHWAY; PLANTS;

D O I：

10.1104/pp.110.153114

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Jasmonic acid and related oxylipins are controversially discussed to be involved in regulating the initiation and progression of leaf senescence. To this end, we analyzed profiles of free and esterified oxylipins during natural senescence and upon induction of senescence-like phenotypes by dark treatment and flotation on sorbitol in Arabidopsis (Arabidopsis thaliana). Jasmonic acid and free 12-oxo-phytodienoic acid increased during all three processes, with the strongest increase of jasmonic acid after dark treatment. Arabidopside content only increased considerably in response to sorbitol treatment. Monogalactosyldiacylglycerols and digalactosyldiacylglycerols decreased during these treatments and aging. Lipoxygenase 2-RNA interference (RNAi) plants were generated, which constitutively produce jasmonic acid and 12-oxo-phytodienoic acid but do not exhibit accumulation during natural senescence or upon stress treatment. Chlorophyll loss during aging and upon dark incubation was not altered, suggesting that these oxylipins are not involved in these processes. In contrast, lipoxygenase 2-RNAi lines and the allene oxid synthase-deficient mutant dde2 were less sensitive to sorbitol than the wild type, indicating that oxylipins contribute to the response to sorbitol stress.

引用

页码：1940 / 1950

页数：11

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