期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 70, 期 20, 页码 5919-5927出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erz337
关键词
ABA; FR-light; MFT; OPDA; phytochrome; seed germination; shade
资金
- Yorkshire Forward
- Northern Way Initiative
- EPSRC [EP/K039660/1, EP/M028127/1]
- Brazilian Government (CAPES)
- Merit Scholarship Program for High Technology (Islamic Development Bank)
- UK Biotechnology and Biological Sciences Research Council [BB/J00216X/1]
- Garfield Weston Foundation
- BBSRC [BB/J00216X/1] Funding Source: UKRI
- EPSRC [EP/M028127/1, EP/K039660/1] Funding Source: UKRI
Light-dependent seed germination is induced by gibberellins (GA) and inhibited by abscisic acid (ABA). The widely accepted view of the GA/ABA ratio controlling germination does not, however, explain the fact that seeds deficient in ABA still germinate poorly under shade conditions that repress germination. In Arabidopsis, MOTHER-OF-FT-AND-TFL1 (MFT) acts as a key negative regulator of germination, modulating GA and ABA responses under shade conditions. Under full light the oxylipin cis-12-oxo-phytodienoic acid (OPDA), a precursor of the stress-related phytohormone jasmonic acid, interacts with ABA and MFT to repress germination. Here, we show that under shade conditions both OPDA and ABA repress germination to varying extents. We demonstrate that the level of shade-induced MFT expression influences the ability of OPDA and/or ABA to fully repress germination. We also found that MFT expression decreases with seed age and this again correlates with the response of seeds to OPDA and ABA. We conclude that OPDA plays an essential role alongside ABA in repressing germination in response to shade and the combined effect of these phytohormones is integrated to a significant extent through MFT.
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