Abstract
In cucumber (Cucumis sativus L. cv. Chinesische Schlange) silicon (Si) supply clearly alleviates symptoms of manganese (Mn) toxicity. Despite of equal total Mn concentrations in the leaves, plants without Si supply had higher Mn concentrations in the intercellular washing fluid (IWF) compared to plants treated with Si. This was particularly expressed in the BaCl2− and DTPA-extractable fraction of the apoplast. Mn tolerance is already enhanced by application of low Si concentrations (< 0.04 mM) and protective effects are observed even when Si is applied prior to the Mn treatment. The Mn concentration of the IWF correlates positively with the severity of Mn toxicity symptoms and negatively with the level of Si supply.
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