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丛枝菌根真菌对紫花苜蓿锑积累和抗氧化活性的影响

DOI: 10.11654/jaes.2015.06.006

Keywords: 丛枝菌根真菌 锑 抗氧化酶 紫花苜蓿

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Abstract:

利用温室盆栽试验, 研究了不同锑浓度(0、500、1000 mg·kg-1)土壤处理下混合接种丛枝菌根(Arbuscular mycorrhizal,AM)真菌(Funneliformis mosseas和Glomus versiforme)后对苜蓿(Medicago Sativa)的锑累积量、生物量和抗氧化酶活性的影响。结果表明:接种AM真菌显着促进了苜蓿对锑的积累。在土壤锑浓度为500 mg·kg-1时, 接种AM真菌地上和地下部分锑含量分别增加了71%和46%;在锑浓度为1000 mg·kg-1时, 地上和地下部分锑含量增加了37%和34%.在土壤锑胁迫条件下, 接种AM真菌能显着提高苜蓿地上部分对磷的吸收, 这可能是苜蓿生物量增加的原因。同时, 接种处理降低了苜蓿中超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)的活性。在锑浓度为500 mg·kg-1,接种AM真菌显着降低了苜蓿SOD和POD活性;在锑浓度为1000 mg·kg-1时, 接种AM真菌显着降低SOD活性

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