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不同浓度Cd对小白菜生长及抗氧化系统的影响

Keywords: Cd,小白菜,生长,叶绿素,抗氧化系统

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Abstract:

采用温室水培试验方法,研究了不同浓度Cd对小白菜生长、叶绿素含量和叶片中抗氧化系统的影响。结果表明,Cd浓度为0.01mg·L-1时促进小白菜生长;Cd浓度为10mg·L-1时,抑制小白菜生长;与对照相比,0.01、0.1mg·L-1Cd处理后,叶绿素a与叶绿素b的含量增加;Cd浓度达到1mg·L-1时,叶绿素a与叶绿素b的含量显著下降(P<0.05)。超氧化物岐化酶(SOD)的活性随Cd处理浓度的增加而下降;愈创木酚过氧化物酶(GPOD)、抗坏血酸过氧化物酶(APX)在Cd浓度为0.1mg·L-1时活性最高;过氧化氢酶(CAT)在Cd浓度为1mg·L-1时活性达到最高;脱氢抗坏血酸还原酶(DHAR)、谷胱甘肽还原酶(GR)的活性和抗坏血酸(AsA)、还原型谷胱甘肽(GSH)的含量在Cd处理浓度为10mg·L-1时最高。

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