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作 者 ：杨秀梅,陈保冬,朱永官,王冬梅,王幼珊

期 刊 ：生态学报 2008年 28卷 3期 页码：1052~1058

关键词：丛枝菌根真菌(Glomus intraradices)；玉米；铜；

Keywords:arbuscular mycorrhizal fungi, maize, copper,

摘 要 ：盆栽试验研究了不同土壤施Cu水平（0、50、200 mg/kg）下，接种不同来源的两个丛枝菌根真菌Glomus intraradices菌株对玉米生长、Cu、P以及微量元素Fe、Mn、Zn吸收的影响。结果表明：接种菌根真菌显著提高了玉米的生物量，增加了玉米植株P浓度和吸收量；随着施Cu水平提高，各处理根系Cu浓度显著增加。各施Cu水平下玉米根系Cu浓度远远高于地上部分Cu浓度，同一施Cu水平下接种处理根系Cu浓度要显著高于对照；尤其在200 mg/kg施Cu水平下，接种处理根系Cu浓度大约是地上部分的45~58倍，对照根系Cu浓度大约是地上部分的12倍。总体上，试验条件下两个菌株对玉米的接种效应没有明显差异。试验表明丛枝菌根对重金属Cu有较强的固持作用，这可能是菌根减轻宿主植物Cu毒害的一个重要机制。

Abstract:In a pot experiment effects of inoculation with two strains of AM fungus Glomus intraradices on growth, Cu and P uptake and mineral nutrition of maize plants under different Cu addition levels were investigated. The results indicated that mycorrhizal inoculation significantly increased dry weights and P uptake of maize plants. Root Cu concentrations markedly increased with increasing Cu addition levels. For all treatments, root Cu concentrations were significantly higher than shoot Cu concentrations，while under each Cu addition level root Cu concentrations of inoculated plants were significantly higher than those of uninoculated controls. Under Cu addition level of 200 mg/kg, root to shoot ratio of Cu concentration in inoculated plants was 44-48, in contrast to 12 for uninoculated plants. In general, no obvious differences were found in the inoculation effects between the two fungal strains. The experiments demonstrsted that arbuscular mycorrhiza could effectively retain Cu in plant roots, which may be one of the key mechanisms for the alleviation of Cu phytotoxicity by mycorrhizal associations.

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