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Regulation of Arabidopsis thaliana seed dormancy and germination by 12-oxo-phytodienoic acid.

ABSTRACT: We previously demonstrated that the oxylipin 12-oxo-phytodienoic acid (OPDA) acts along with abscisic acid to regulate seed germination in Arabidopsis thaliana, but the mechanistic details of this synergistic interaction remain to be elucidated. Here, we show that OPDA acts through the germination inhibition effects of abscisic acid, the abscisic acid-sensing ABI5 protein, and the gibberellin-sensing RGL2 DELLA protein. We further demonstrate that OPDA also acts through another dormancy-promoting factor, MOTHER-OF-FT-AND-TFL1 (MFT). Both abscisic acid and MFT positively feed back into the OPDA pathway by promoting its accumulation. These results confirm the central role of OPDA in regulating seed dormancy and germination in A. thaliana and underline the complexity of interactions between OPDA and other dormancy-promoting factors such as abscisic acid, RGL2, and MFT.

SUBMITTER: Dave A

PROVIDER: S-EPMC4809285 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature

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Regulation of Arabidopsis thaliana seed dormancy and germination by 12-oxo-phytodienoic acid.

Dave Anuja A Vaistij Fabián E FE Gilday Alison D AD Penfield Steven D SD Graham Ian A IA

Journal of experimental botany 20160211 8

We previously demonstrated that the oxylipin 12-oxo-phytodienoic acid (OPDA) acts along with abscisic acid to regulate seed germination in Arabidopsis thaliana, but the mechanistic details of this synergistic interaction remain to be elucidated. Here, we show that OPDA acts through the germination inhibition effects of abscisic acid, the abscisic acid-sensing ABI5 protein, and the gibberellin-sensing RGL2 DELLA protein. We further demonstrate that OPDA also acts through another dormancy-promotin ...[more]

PMID: 26873978

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