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核农学报  2013 

AMF对假高粱分泌有机酸及吸收137Cs的影响

DOI: 10.11869/hnxb.2013.08.1203, PP. 1203-1208

Keywords: AMF,假高粱,有机酸,137Cs

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Abstract:

通过盆栽试验研究了137Cs污染土壤接种Glomusgeosporum(G.g),Glomusmosseae(G.m),Glomusversiforme(G.v),Glomusetunicatum(G.e)和Glomusdiaphanum(G.d)等5种丛枝菌根真菌(AMF)对假高粱根系分泌有机酸组分和含量影响以及不同AMF对寄主植物吸收土壤核素137Cs的效应,并采用逐步回归分析建立了根系分泌有机酸组分含量与植物吸收137Cs的关系。结果表明,与不接种处理相比,接种G.g,G.m,G.v和G.d能不同程度地减少假高粱根系有机酸组分及各组分含量,其中接种G.m处理降低有机酸总量的幅度最大,达到67.37μg·cm-2·3h-1。接种G.m、G.e和G.d显著提高了假高粱地下部、叶片和茎干蓄积137Cs比活度,说明接种G.m、G.e和G.d可能会增强假高粱富集137Cs的能力。相关性分析表明,假高粱各部位蓄积137Cs比活度与有机酸组分含量均呈负相关,且通过逐步回归分析发现植物富集137Cs的能力主要受草酸含量的影响,因此可以通过农艺措施降低根际草酸含量来增强植物对放射性核素的吸收与转运。

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