| 20190093 |
Seltmann MA, Stingl NE, Lautenschlaeger JK, Krischke M, Mueller MJ, Berger S: Differential impact of lipoxygenase 2 and jasmonates on natural and stress-induced senescence in Arabidopsis thaliana. Plant Physiol. 2010 Feb 26.
Jasmonic acid and related oxylipins are controversely discussed to be involved in regulating the initiation and progression of leaf senescence. To this end we analysed 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 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 did only increase considerably in response to sorbitol treatment. Mono- and digalactosyldiacylglycerols decreased during these treatments and aging. Lipoxygenase 2-RNAi plants were generated which produce constitutively 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, lipoxygenase2-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. |
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