Apoplastic Binding of Aluminum Is Involved in Silicon-Induced Amelioration of Aluminum Toxicity in Maize
作者： Yunxia Wang , Angelika Stass , Walter J. Horst
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摘要: The alleviating effect of silicon (Si) supply on aluminum (Al) toxicity was suggested to be based ex or in planta mechanisms. In our experiments with the Al-sensitive maize (Zea mays) cultivar Lixis, Si treatment but not pretreatment ameliorated Al-induced root injury as revealed by less root-growth inhibition and callose formation. did affect monomeric Al concentrations nutrient solution, suggesting an resistance. A fractionated analysis 1-cm apices that more than 85% root-tip bound cell wall. contents apoplastic sap, symplastic wall differ between −Si +Si plants. exudation organic acid anions phenols from apices. However, greatly enhanced accumulation fraction, reducing mobility Al. From data we conclude leads formation hydroxyaluminumsilicates apoplast apex, thus detoxifying
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