Barros Galvão, Thiago, Vaistij, Fabian Emmanuel and Graham, Ian Alexander orcid.org/0000-0003-4007-1770 (2019) Control of seed coat rupture by ABA-INSENSITIVE 5 in Arabidopsis thaliana. Seed Science Research. ISSN 0960-2585
Abstract
In Arabidopsis, seed germination is a biphasic process involving rupture of the seed coat followed by emergence of the radicle through the micropylar endosperm. Embryo expansion results in seed coat rupture and removal of seed coat imposed dormancy with DELLA proteins blocking embryo expansion in the absence of gibberellins. Exogenous abscisic acid (ABA) treatment does not block seed coat rupture but does block radicle emergence. We used this limited effect of exogenous ABA to further investigate the mechanism by which it blocks the onset of germination marked by seed coat rupture. We show that physical nicking of the seed coat results in exogenous ABA treatment blocking both seed coat and endosperm rupture and this block requires the transcription factors ABI3 and ABI5, but not ABI4. Furthermore, we show that the repression of expression of several EXPANSIN genes (EXPA1, EXPA2, EXPA3, EXPA9 and EXPA20) by exogenous ABA requires ABI5. We conclude that ABI5 plays an important role in the ABA-mediated repression of germination through prevention of seed coat rupture and propose that this involves EXPANSIN related control of cell wall loosening.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Cambridge University Press 2019. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details. |
Keywords: | ABA,ABI5,EXPANSIN,nicking,testa rupture |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Biology (York) > Centre for Novel Agricultural Products (CNAP) (York) The University of York > Faculty of Sciences (York) > Biology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 13 Mar 2019 11:40 |
Last Modified: | 21 Jan 2025 17:38 |
Published Version: | https://doi.org/10.1017/S0960258519000059 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | 10.1017/S0960258519000059 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:143628 |
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Description: Barros Galvao et al Second revision