低磷和铝毒胁迫条件下菜豆有机酸的分泌与累积

以水培方式研究了低磷、铝毒胁迫条件下，不同菜豆基因型根系有机酸的分泌及其在植穆不同部位的累积，结果表明，低磷，铝毒胁迫诱导菜豆有机酸的分泌与累积存在显著的基因差异。低磷、铝毒胁迫诱导菜豆主要分泌柠檬酸、酒石酸和乙酸，其中，50μmol/LAl^3 诱导柠檬酸分泌量最高；低磷（小于20μmol/LH2PO4^－）胁迫诱导柠榨菜酸分泌量显著高于高磷处理，但低磷处理之间差异不明显，铝毒胁迫诱导菜豆有机酸的分泌与累积显著高于低磷胁迫处理，低磷，铝毒胁迫植株不同部位有机酸的含量为叶片大小根系，低磷，铝毒胁迫时，G842菜豆型柠檬酸有机酸分泌总量显著高于273、AFR和ZPV，其干重和磷吸收明明显于大G273，AFR和ZPV，且铝吸收量小于G273，AFR和ZPV，说明，G482菜豆基因型对低磷，铝毒的适应能力强于G273，AFR和ZPV基因型，菜豆有机酸，，尤其柠檬酸的分泌是其适应低磷、铝毒胁迫的重要生理反应。

Exudation and Accumulation of Organic Acids in the Roots of Common Bean (Phaseolus vulgaris L.) in Response to Low Phosphorus and Aluminum Toxicity Stress

Low avaliability of soil phosphorus (P) and high activity of aluminum (Al) ion are two primary constraints to crops grown on tropical acid soils.These two factors limited common bean production severely in South China.The proposed mechanisms of Al resistance in plants are usually divided into external exclusion and internal tolerance.However,the internal tolerance mechanism hypothesis could not explain how Al|sensitive apoplastic functions are protected from Al toxicity.Therefore,recent studies have focus...