A transcriptional hub integrating gibberellin-brassinosteroid signals to promote seed germination in Arabidopsis.

Journal of Experimental Botany
Chunmei ZhongXiaojing Wang

Abstract

Seed germination is regulated by multiple phytohormones, including gibberellins (GAs) and brassinosteroids (BRs); however, the molecular mechanism underlying GA and BR co-induced seed germination is not well elucidated. We demonstrated that BRs induce seed germination through promoting testa and endosperm rupture in Arabidopsis. BRs promote cell elongation, rather than cell division, at the hypocotyl-radicle transition region of the embryonic axis during endosperm rupture. Two key basic helix-loop-helix transcription factors in the BR signaling pathway, HBI1 and BEE2, are involved in the regulation of endosperm rupture. Expression of HBI1 and BEE2 was induced in response to BR and GA treatment. In addition, HBI1- or BEE2-overexpressing Arabidopsis plants are less sensitive to the BR biosynthesis inhibitor, brassinazole, and the GA biosynthesis inhibitor, paclobutrazol. HBI1 and BEE2 promote endosperm rupture and seed germination by directly regulating the GA-Stimulated Arabidopsis 6 (GASA6) gene. Expression of GASA6 was altered in Arabidopsis overexpressing HBI1, BEE2, or SRDX-repressor forms of the two transcription factors. In addition, HBI1 interacts with BEE2 to synergistically activate GASA6 expression. Our findings define...Continue Reading

References

Feb 13, 2001·Plant Physiology·C M Steber, P McCourt
Sep 13, 2001·Plant Physiology·J LiJ Chory
Jan 15, 2002·Current Opinion in Plant Biology·Maarten KoornneefHenk Hilhorst
May 10, 2002·The Plant Journal : for Cell and Molecular Biology·Cristel CarlesMichel Delseny
Jun 5, 2002·The Plant Cell·Neil OlszewskiFrank Gubler
Jul 13, 2002·Proceedings of the National Academy of Sciences of the United States of America·Jun-Xian HeZhi-Yong Wang
Aug 2, 2002·Cell·Kyoung Hee Nam, Jianming Li
Jul 1, 1997·The Plant Cell·J. D. Bewley
Nov 2, 2002·The Plant Journal : for Cell and Molecular Biology·Luis Lopez-MolinaNam-Hai Chua
Jun 6, 2003·The Plant Journal : for Cell and Molecular Biology·Keiichiro HiratsuMasaru Ohme-Takagi
Aug 5, 2003·The Plant Cell·Gabriela Toledo-OrtizPeter H Quail
Jul 27, 2006·The New Phytologist·William E Finch-Savage, Gerhard Leubner-Metzger
Nov 26, 2008·Plant Molecular Biology·Mitsunori SeoShinjiro Yamaguchi
Dec 15, 2010·The Plant Journal : for Cell and Molecular Biology·Lior Rubinovich, David Weiss
Mar 25, 2011·Journal of Experimental Botany·Karin WeitbrechtGerhard Leubner-Metzger
Jan 1, 2008·The Arabidopsis Book·Leónie Bentsink, Maarten Koornneef
Aug 1, 2012·Proceedings of the National Academy of Sciences of the United States of America·Javier Gallego-BartoloméMiguel A Blázquez
Oct 2, 2012·The Plant Journal : for Cell and Molecular Biology·Xingshan JiangXiaojing Wang
Feb 8, 2014·Proceedings of the National Academy of Sciences of the United States of America·Miroslava K ZhiponovaEugenia Russinova
Mar 24, 2016·The Plant Cell·John J Ross, Laura J Quittenden

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