Effects of Superoxide Radical on Root System Growth and Auxin Distribution in Rice  

超氧阴离子对水稻根系生长和生长素分布的影响(英文)

作　　者：任静[1] 冯婷婷[1] 陈振华[1] 刘乐雨[1] 冯永永[1] 高华健[1] 赵凤云[1] 

机构地区：[1]山东理工大学生命科学学院,山东淄博255049

出　　处：《Agricultural Science & Technology》2012年第8期1655-1657,1663,共4页农业科学与技术（英文版）

基　　金：Supported by the National Natural Science Foundation of China(30671126);the Science and Technology Development Plan of Zibo City(109036,111089)~~

摘　　要：[Objective] This study aimed to investigate the effect of superoxide radical on root system growth and auxin distribution in rice （Oryza sativa L. cv Zhonghua No.11）. [Method] With rice Zhonghua No.ll as the experimental material, the effects of DDC （SOD inhibitor） and Tiron （superoxide radical scavenger） on the root system growth, superoxide radical generation and root system auxin distribution in rice were analyzed. [Result] The growth and elongation of primary and adventitious roots were significantly promoted by DDC, while Tiron significantly inhibited the growth and elongation of shoots, primary roots and their lateral roots, and also suppressed the formation and growth of the adventitious roots as well as the elongation of their lateral roots. The superoxide radical was increased with the induction of DDC, while Tiron decreased the accumulation of superoxide radical. Increased accumulation of auxin in the vascular bundle and behind the elongation zone was observed in DDC- treated roots, while the treatment with Tiron resulted in a decrease of auxin in the same position. [Conclusion] This study indicated that the regulation of rice root sys- tem growth by superoxide radical was closely related with the accumulation and distribution of auxin.[目的]探讨超氧阴离子对水稻根系生长和生长素分布的影响。[方法]以水稻中花11号为试验材料,分析了DDC(SOD抑制剂)和Tiron(超氧阴离子清除剂)对水稻根系生长、超氧阴离子产生和生长素积累分布的影响。[结果]DDC显著促进了初生根和不定根的伸长生长及其侧根的形成和伸长,Tiron则显著抑制了地上部分、初生根及其侧根的伸长生长,对不定根的形成和伸长及其侧根的生长也有显著的抑制作用。DDC诱导超氧阴离子增加,而Tiron使超氧阴离子的积累减少。DDC诱导生长素在根伸长区以后部位和维管束内的积累增加,相反,Tiron使生长素的积累减少。[结论]该研究结果表明超氧阴离子对水稻根系生长的调节与其诱导生长素积累和分布的变化有密切关系。

关 键 词：Superoxide Radical Rice Root System AUXIN 

分 类 号：S511[农业科学—作物学]