低磷胁迫对豇豆幼苗叶片光合特性及根系生理特性的影响

被引：43

作者：

曹翠玲

毛圆辉

曹朋涛

刘建朝

杨向娜

机构：

[1] 西北农林科技大学生命科学学院

来源：

植物营养与肥料学报 | 2010年 / 16卷 / 06期

关键词：

磷胁迫; 光合特性; 根系生理; 酸性磷酸酶活性;

D O I：

暂无

中图分类号：

S643.4 [豇豆];

学科分类号：

090202 ;

摘要：

利用营养液培养方法研究了豇豆幼苗对磷胁迫的生理响应。结果表明,磷胁迫下豇豆根系最大根长增加43%,侧根数目增加33%,根系体积增加;但是缺磷时叶片面积变小,且发育延迟。缺磷时豇豆幼苗根系活力和根系表面酸性磷酸酶活性分别是全磷培养植株的2.3和1.7倍;与供磷植株相比,缺磷植株光合速率和蒸腾速率均下降30%;气孔器变小,气孔密度减少(减少20%)。磷胁迫下豇豆干物质累积量显著降低,缺磷主要影响了地上部分干物质累积,而根系干物质累积几乎不变,因此根冠比增大。磷胁迫对地上的影响大于对根系的影响。

引用

页码：1373 / 1378

页数：6

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