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OALib Journal期刊
ISSN: 2333-9721
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模拟干旱胁迫对岷江干旱河谷―山地森林交错带4种乡土植物抗氧化酶系统的影响
DOI: 10.3724/SP.J.1145.2010.00478, PP. 478-482
Keywords: 干旱河谷,交错带,乡土植物,抗氧化酶活性,干旱胁迫
Abstract:
为解干旱河谷―山地森林交错带植物在干旱胁迫条件下的抗性生理特征，以交错带4种典型植物狗尾草（setariaviridis）、岷江柏（cupressuschengiana）、高山柳（salixparaqplesia）和沙棘（hippophaerhamnoides）为研究对象，测定干旱胁迫条件下植物叶片抗氧化酶活性以及游离脯氨酸（pro）、丙二醛（mda）和色素含量的变化.干旱胁迫显著降低了4种植物叶片叶绿素a、叶绿素b和类胡萝卜素含量，增加了叶片pro和mda含量，增加了细胞膜透性，提高了过氧化物酶（pod）、超氧化物歧化酶（sod）和过氧化氢酶（cat）活性，表明交错带植物在干旱胁迫条件下具有较强的抗旱能力.相对于岷江柏和高山柳，狗尾草和沙棘在相应水分条件下表现出较高的叶绿素a/b、pro含量及pod、sod和cat活性，抗旱能力较高；而高山柳叶片上述各指标相对较低，抗旱性相对较差.研究结果为了解交错带不同生活型物种在干旱条件下的适应提供了理论依据.图2表2参26
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