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The heading-date gene Ghd7 inhibits seed germination by modulating the balance between abscisic acid and gibberellins

文献类型： 外文期刊

作者： Hu, Yong 1 ; Song, Song 2 ; Weng, Xiaoyu 2 ; You, Aiqing 1 ; Xing, Yongzhong 2 ;

作者机构： 1.Hubei Acad Agr Sci, Food Crops Res Inst, Hubei Key Lab Food Crop Germplasm & Genet Improve, Wuhan 430064, Hubei, Peoples R China

2.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Hubei, Peoples R China

3.Huazhong Agr Univ, Natl Ctr Plant Gene Res Wuhan, Wuhan 430070, Hubei, Peoples R China

关键词： Ghd7; Seed germination; Abscisic acid; Gibberellins; ABA/GA(3) ratio

期刊名称：CROP JOURNAL （ 影响因子：3.395； ）

ISSN： 2095-5421

年卷期： 2021 年 9 卷 2 期

页码：

收录情况： SCI

摘要： Seed dormancy of cultivated rice was largely weakened during the progress of domestication. Correct timing and uniformity of seed germination are important for rapid seedling establishment and high-yield production. In the present study, we found that the heading-date gene Ghd7 acted as a negative regulator of germination. A mutant of ghd7 showed low sensitivity to exogenous ABA treatment during seed germination. Further investigation revealed reduced accumulation of ABA in mature ghd7 seeds as a consequence of dampened expression of OsNCED genes. Moreover, elevated GA(3) level was detected in seeds of ghd7 mutant during imbibition course, which was attributed to the induction of genes responsible for the synthesis pathways of bioactive GAs. Thus, Ghd7 inhibits seed germination by increasing the ABA/GA(3) ratio. Besides revealing pleiotropic effects of Ghd7, our results indicate its role in linking seed germination to growth-phase transition in rice, which would enrich the theoretical basis for future breeding practices. (C) 2020 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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