钴对干旱胁迫下大豆幼苗叶片的保护作用及其机理

被引：48

作者：

焦健

李朝周

黄高宝

机构：

[1] 甘肃农业大学农学院

来源：

应用生态学报 | 2006年 / 05期

关键词：

干旱胁迫; 氯化钴; 大豆; 乙烯; 多胺; 活性氧;

D O I：

10.13287/j.1001-9332.2006.0159

中图分类号：

S565.1 [大豆];

学科分类号：

090302 [植物营养学];

摘要：

报道了钴对干旱胁迫下大豆幼苗叶片多胺含量、活性氧水平、抗氧化酶活性及细胞膜透性的影响,揭示了钴对干旱胁迫下大豆幼苗叶片的保护作用及机制.结果表明,CoCl2(30μmol·L-1)可以显著抑制干旱胁迫下乙烯的产生.在干旱胁迫0～12d,CoCl2对叶片丙二醛(MDA)含量和叶绿素含量无显著影响.当干旱胁迫持续15～21d,CoCl2显著抑制叶片多胺氧化酶及二胺氧化酶活性的提高,使腐胺、精胺和亚精胺含量的下降幅度减小.CoCl2显著提高了抗氧化酶的活力,有效抑制了胁迫后期(15～21d)MDA含量的增加,减轻了叶绿素含量和细胞膜稳定指数的下降.可以认为,当大豆幼苗叶片由于持续干旱而遭受较为严重的细胞伤害时,CoCl2通过抑制乙烯产生、抑制多胺含量下降以及提高抗氧化酶的活性,缓解了活性氧的累积和细胞膜透性的破坏,对干旱胁迫下大豆幼苗叶片具有一定的保护作用.

引用

页码：796 / 800

页数：5

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