Quantifying the sensitivity of barley seed germination to oxygen, abscisic acid, and gibberellin using a population-based threshold model

Journal of Experimental Botany
Kent J BradfordFrançoise Corbineau

Abstract

Barley (Hordeum vulgare L.) seeds (grains) exhibit dormancy at maturity that is largely due to the presence of the glumellae (hulls) that reduce the availability of oxygen (O2) to the embryo. In addition, abscisic acid (ABA) and gibberellins (GAS) interact with O2 to regulate barley seed dormancy. A population-based threshold model was applied to quantify the sensitivities of seeds and excised embryos to O2, ABA, and GA, and to their interactive effects. The median O2 requirement for germination of dormant intact barley seeds was 400-fold greater than for excised embryos, indicating that the tissues enclosing the embryo markedly limit O2 penetration. However, embryo O2 thresholds decreased by another order of magnitude following after-ripening. Thus, increases in both permeability of the hull to O2 and embryo sensitivity to O2 contribute to the improvement in germination capacity during after-ripening. Both ABA and GA had relatively small effects on the sensitivity of germination to O2, but ABA and GA thresholds varied over several orders of magnitude in response to O2 availability, with sensitivity to ABA increasing and sensitivity to GA decreasing with hypoxia. Simple additive models of O2-ABA and O2-GA interactions required ...Continue Reading

References

Aug 1, 1994·Plant Physiology·K. J. Bradford, A. J. Trewavas
Dec 17, 2003·Journal of Experimental Botany·Takeru GonaiToshihito Yoshioka
Mar 21, 2006·Journal of Experimental Botany·Roberto L Benech-ArnoldFrançoise Corbineau
Oct 1, 1990·Plant Physiology·K J Bradford
May 20, 2006·The Plant Journal : for Cell and Molecular Biology·Cassandra S C CadmanWilliam E Finch-Savage
Jul 27, 2006·The New Phytologist·William E Finch-Savage, Gerhard Leubner-Metzger
Mar 23, 2007·The Plant Journal : for Cell and Molecular Biology·Krystyna OraczChristophe Bailly
Jan 1, 1996·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·F HanI Romagosa

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Citations

Mar 23, 2013·Journal of Experimental Botany·Hai Ha HoangJuliette Leymarie
Mar 8, 2016·Life Sciences in Space Research·Myoung Ryoul Park, Karl H Hasenstein
Feb 7, 2015·Plant Biotechnology Journal·Guillermina M MendiondoMichael J Holdsworth
Mar 2, 2010·Respiratory Physiology & Neurobiology·Laura De GaraMaria C de Pinto
Sep 17, 2013·PloS One·Louis G BoddyAlbert J Fischer
Sep 2, 2009·Plant Signaling & Behavior·Juliette LeymarieFrançoise Corbineau
May 7, 2020·Plants·Katherine J WhitehouseCharlotte Lusty
Jan 24, 2019·International Journal of Molecular Sciences·Shinnosuke IshikawaTaishi Umezawa
Jan 17, 2021·Bulletin of Mathematical Biology·Cody FitzGerald, James Keener
Sep 13, 2021·The Plant Journal : for Cell and Molecular Biology·Matthew WalkerGerhard Leubner-Metzger
Oct 12, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Daniel W SweeneyMark E Sorrells

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