Initial exploration of the mechanism underlying H2O2-induced root horizontal bending in pea

文献类型： 外文期刊

第一作者： Li, Sheng

作者： Li, Sheng;Su, Li-Rong;Ma, Shao-Ying;Shi, Zhen-Zhen;Yang, Xiao-Ming

作者机构：

关键词： Gravitropism;Exogenous H2O2;Horizontal bending;Primary pea root

期刊名称：SCIENCE BULLETIN （ 影响因子：11.78； 五年影响因子：7.658 ）

ISSN： 2095-9273

年卷期： 2015 年 60 卷 14 期

页码：

收录情况： SCI

摘要： It was reported that exogenous hydrogen peroxide (H2O2) can induce primary root bend in Arabidopsis and pea. However, the mechanism remains unclear. Here we explored the mechanism underlying this phenomenon by using the pea (Pisum sativum L.) variety "longwan No. 1''. The results showed that the endogenous indole-3-acetic acid (IAA) content decreased and gibberellin A(3) (GA(3)) content increased in the curving primary pea root induced by H2O2. Meanwhile, both of the two hormones asymmetrically distributed in the inside and outside parts of the curving root. Also, the starch content decreased due to the increased alpha-amylase activity in this process. However, exogenous Ca2+ can relieve the horizontal bending of pea root induced by H2O2 and altered the contents of endogenous IAA and GA(3). A working model was proposed: Exogenous H2O2 causes the increase in GA(3) content, and GA(3) stimulates the activity of a-amylase, which leads to the hydrolysis of starch, and then the root lost the gravityperceiving. The asymmetric distribution of IAA and GA(3) in two sides of curving root may cause the horizontal bending. Exogenous Ca2+ can relieve root bending through altering the endogenous IAA and GA(3) contents.

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