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OALib Journal期刊
ISSN: 2333-9721
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干旱胁迫和复水对梨幼树生理特性的影响
DOI: 10.3724/SP.J.1145.2012.00218, PP. 218-223
Keywords: 梨树,干旱胁迫,复水,光合参数,相对含水量,质膜透性,超氧化物歧化酶,脯氨酸
Abstract:
为了解植物干旱生理适应机制和恢复机制，以梨品种‘翠冠’和‘黄冠’幼树为试材，研究土壤干旱胁迫及复水条件下叶片光合参数、叶片相对含水量、叶片质膜透性、超氧化物歧化酶活性及脯氨酸含量的变化特性.结果显示：1）随着干旱胁迫的加剧，两品种的叶片净光合速率、气孔导度和蒸腾速率均呈下降趋势；‘翠冠’叶片胞间co2浓度呈先降后升的趋势，而‘黄冠’呈持续下降趋势，但‘黄冠’光合作用的4项指标明显高于‘翠冠’；复水后，两品种的光合指标恢复显著，但均未超过对照水平.2）干旱胁迫引起两品种的叶片相对含水量急剧下降，叶片质膜透性和脯氨酸含量显著升高，超氧化物歧化酶活性呈先升后降趋势；复水后，两品种的4项指标不同程度地得以恢复，但大部分指标没有恢复到对照水平，其中‘黄冠’各项指标在复水前后的变化幅度比‘翠冠’更小.综合分析表明，‘翠冠’和‘黄冠’对干旱胁迫的响应存在差异，‘黄冠’对干旱逆境具有更强的适应能力.图2表1参27
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