Phosphate induced carboxylate and proton release by tomato roots

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