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Delayed germination of Brassica parachinensis seeds by coumarin involves decreased GA(4) production and a consequent reduction of ROS accumulation

文献类型： 外文期刊

作者： Chen, Bing-Xian 1 ; Peng, Yuan-Xuan 1 ; Yang, Xue-Qin 3 ; Liu, Jun 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Agrobiol Gene Res Ctr, Guangdong Prov Key Lab Crop Germplasm Resources P, Guangzhou, Peoples R China

2.Zhongkai Univ Agr & Engn, Coll Agr & Biol, Guangzhou, Peoples R China

3.South China Agr Univ, Coll Life Sci, Guangzhou, Peoples R China

关键词： coumarin; GAs; ROS; seed germination

期刊名称：SEED SCIENCE RESEARCH （ 影响因子：2.25； 五年影响因子：2.5 ）

ISSN： 0960-2585

年卷期： 2021 年 31 卷 3 期

页码：

收录情况： SCI

摘要： The plant allelochemical coumarin effectively inhibits the germination of Brassica parachinensis (B. parachinensis) seeds. Quantification of endogenous phytohormones showed that contents of abscisic acid (ABA), ABA glucose ester, gibberellin A20 (GA(20)), GA(3), GA(15), GA(24), GA(9) and GA(4) were higher in germinating seeds than in seedlings. Moreover, the presence of coumarin significantly reduced the content of bioactive GA(4) which is thought to positively regulate seed germination. Histochemical staining and spectrophotometry of reactive oxygen species (ROS) revealed that exogenous GA(3) and GA(4+7) could effectively promote the production of endogenous ROS during germination and that the GA synthesis inhibitor paclobutrazol could effectively inhibit production of ROS. Coumarin significantly inhibited the accumulation of ROS, especially superoxide anion radical O-2(-). This inhibitory effect could be restored by the addition of exogenous GA(3) and GA(4+7). Coumarin also inhibited the activity of the ROS-degrading enzymes such as superoxide dismutase, catalase and peroxidase as well as beta-amylase in seeds and seedlings. Taken together, we propose a model for the regulation of seed germination in B. parachinensis by coumarin, Gas and ROS, in which coumarin may delay seed germination by reducing endogenous GA(4), thus decreasing the accumulation of ROS.

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