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草业学报  2015 

Cd2+对狗牙根、假俭草种子萌发及幼苗生长的影响

DOI: 10.11686/cyxb20150512, PP. 100-107

Keywords: Cd2+,狗牙根,假俭草,种子萌发,幼苗生长

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Abstract:

探讨了Cd2+浓度对狗牙根与假俭草种子萌发和幼苗生长的影响。结果表明,两草种种子的发芽势、发芽率、发芽指数、活力指数、根长以及幼苗长度均随Cd2+浓度的升高而降低;叶片叶绿素含量随Cd2+浓度的升高略有降低;叶片丙二醛(MDA)含量随Cd2+浓度的升高呈先降后升趋势;狗牙根过氧化氢酶(CAT)活性随Cd2+浓度升高呈先升高后降低趋势,在5.0mg/L时显著高于CK,假俭草各处理浓度的CAT活性均低于CK;两草种的过氧化物酶(POD)活性随Cd2+浓度的升高呈先升高后降低趋势,并在10.0mg/L时达到峰值;Cd2+浓度在5.0,10.0,20.0,40.0mg/L时,狗牙根和假俭草多酚氧化酶(PPO)活性均高于CK,两草种PPO活性随Cd2+浓度的升高都呈先升高后降低趋势。两草种对Cd2+均有一定的耐受能力,狗牙根耐受能力大于假俭草,二者均可以应用于Cd2+轻度污染土壤。

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