Salinity Inhibits Rice Seed Germination by Reducing alpha-Amylase Activity via Decreased Bioactive Gibberellin Content
文献类型： 外文期刊
作者： Liu, Li 1 ; Xia, Weili 1 ; Li, Haixia 1 ; Zeng, Hanlai 1 ; Wei, Benhui 2 ; Han, Suoyi 3 ; Yin, Changxi 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan, Hubei, Peoples R China
2.Guangxi Acad Agr Sci, Cash Crops Res Inst, Nanning, Peoples R China
3.Henan Acad Agr Sci, Ind Crops Res Inst, Zhengzhou, Henan, Peoples R China
关键词： alpha-amylase activity; alpha-amylase gene expression; gibberellin; rice; salinity; seed germination
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）
ISSN： 1664-462X
年卷期： 2018 年 9 卷
页码：
收录情况： SCI
摘要： Seed germination plays important roles in the establishment of seedlings and their subsequent growth; however, seed germination is inhibited by salinity, and the inhibitory mechanism remains elusive. Our results indicate that NaCl treatment inhibits rice seed germination by decreasing the contents of bioactive gibberellins (GAs), such as GA(1) and GA(4); and that this inhibition can be rescued by exogenous bioactive GA application. To explore the mechanism of bioactive GA deficiency, the effect of NaCl on GA metabolic gene expression was investigated, revealing that expression of both GA biosynthetic genes and GA-inactivated genes was up-regulated by NaCl treatment. These results suggest that NaCl-induced bioactive GA deficiency is caused by up-regulated expression of GA-inactivated genes, and the up-regulated expression of GA biosynthetic genes might be a consequence of negative feedback regulation of the bioactive GA deficiency. Moreover, we provide evidence that NaCl-induced bioactive GA deficiency inhibits rice seed germination by decreasing alpha-amylase activity via down-regulation of alpha-amylase gene expression. Additionally, exogenous bioactive GA rescues NaCl-inhibited seed germination by enhancing alpha-amylase activity. Thus, NaCl treatment reduces bioactive GA content through promotion of bioactive GA inactivation, which in turn inhibits rice seed germination by decreasing alpha-amylase activity via down-regulation of alpha-amylase gene expression.
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