低磷和铝毒胁迫条件下菜豆有机酸的分泌与累积

被引:26
作者
沈宏
严小龙
机构
[1] 华南农业大学植物营养遗传与根系生物学实验室
基金
广东省自然科学基金;
关键词
低磷和铝毒胁迫; 有机酸; 分泌与累积;
D O I
暂无
中图分类号
S643.1 [菜豆(四季豆)];
学科分类号
摘要
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株不同部位的累积。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型差异。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 ,5 0 μmol/L Al3 +诱导柠檬酸分泌量最高 ;低磷 (小于 2 0 μmol/L H2 PO- 4-)胁迫诱导柠檬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于根系。低磷、铝毒胁迫时 ,G84 2菜豆基因型柠檬酸和有机酸分泌总量显著高于 G2 73、AFR和 ZPV;其干重和磷吸收量明显大于 G2 73、AFR和 ZPV,且铝吸收量小于 G2 73、AFR和 ZPV,说明 ,G84 2菜豆基因型对低磷、铝毒的适应能力强于 G2 73、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
引用
收藏
页码:387 / 394
页数:8
相关论文
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