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Exudation of carboxylic anions and protons by plant roots plays an important role in mobilizing soil P under P-deficiency conditions. The objective of this work was to quantify short-term (6 h) carboxylate and H+ exudation by tomato roots in response to P concentration (0, 0.1, 0.5 and 1.0 mt M P) in nutrient solution (Cp). The exudation rate of tri- and dicarboxylates decreased exponentially with increasing Cp, from 0.3 to 0.03 mol plant–1 6h–1. At low Cp the predominant exudates were fumarate, citrate and succinate, while at Cp=0.5 and 1.0 mt M the prevalent anions were succinate and citrate. The solution pH declined sharply as Cp was lowered from 0.1 (pH=4.2) to 0 mt M P (pH=3.7). 相似文献
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