A transcriptional hub integrating gibberellin–brassinosteroid signals to promote seed germination in Arabidopsis
| العنوان: | A transcriptional hub integrating gibberellin–brassinosteroid signals to promote seed germination in Arabidopsis |
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| المؤلفون: | Xukun Li, Chunmei Zhong, Yi Tang, Xiaojing Wang, Ling Yuan, Barunava Patra |
| المصدر: | Journal of Experimental Botany |
| بيانات النشر: | Oxford University Press, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | 0106 biological sciences, 0301 basic medicine, Arabidopsis thaliana, Physiology, Arabidopsis, seed germination, Germination, Plant Science, 01 natural sciences, Endosperm, GASA6, 03 medical and health sciences, chemistry.chemical_compound, bHLH, Gene Expression Regulation, Plant, Brassinosteroids, Basic Helix-Loop-Helix Transcription Factors, Brassinosteroid, Transcription factor, biology, Chemistry, AcademicSubjects/SCI01210, Arabidopsis Proteins, fungi, digestive, oral, and skin physiology, food and beverages, BEE2, Cell Biology, brassinosteroids (BRs), biology.organism_classification, Research Papers, Gibberellins, Cell biology, 030104 developmental biology, Seeds, HBI1, Gibberellin, Signal transduction, gibberellins (GAs), 010606 plant biology & botany |
| الوصف: | A transcriptional module amplifies the gibberellin and brassinosteroid signal to accelerate endosperm rupture to promote seed germination in Arabidopsis. 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 a new role for GASA6 in GA and BR signaling and reveal a regulatory module that controls GA and BR co-induced seed germination in Arabidopsis. |
| اللغة: | English |
| تدمد: | 1460-2431 0022-0957 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10935e86be05c743f01449f5433188f4 http://europepmc.org/articles/PMC8219041 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....10935e86be05c743f01449f5433188f4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14602431 00220957 |
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