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汞胁迫对水稻生长及幼苗生理生化的影响

Keywords: 汞胁迫,水稻,水培

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Abstract:

通过水培试验,研究汞胁迫下水稻的生长指标包括株高、分蘖和根冠比的变化以及生理生化指标包括叶绿素含量、游离脯氨酸含量及SOD、POD、CAT保护酶活性的变化。结果表明,低浓度汞处理对水稻株高、穗重有促进作用,高浓度处理则显著降低株高和穗重;低浓度汞处理对水稻分蘖影响不明显,而10mg·L-1Hg2+显著降低分蘖数,且无效蘖、小、弱分蘖增多。汞胁迫下根冠比增加,汞对茎叶的抑制作用大于对根的影响。汞胁迫下CAT、POD活性总体上变化不明显,但均在10mg·L-1Hg2+时达到较高值。汞胁迫对叶片相对含水量及脯氨酸含量的影响不显著。不同浓度处理的叶绿素b、类胡萝卜素的含量与对照相比均不显著。而叶绿素a和叶绿素a+b在低浓度处理时其含量均高于对照,高浓度对叶绿素a起到抑制作用。

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