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磷和外源生长素对白羽扇豆(LupinusalbusL.)根形态和生理特性的影响

DOI: 10.1360/052012-284, PP. 201-212

Keywords: 排根,有机酸分泌,质子,缺磷,白羽扇豆

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Abstract:

白羽扇豆(LupinusalbusL.)对磷和生长素表现出高度的根系形态和生理可塑性反应,然而磷和生长素如何调节根形态和生理特性以及它们对根形态和生理的交互效应尚不清楚.本研究通过水培实验旨在评价磷(0或250μmol/L)和生长素(10-8mol/LNAA)对白羽扇豆根特性的影响及其交互效应.结果表明,缺少磷和生长素施用均明显改变了白羽扇豆的根形态(主根长度减少、一级侧根数目增加和排根大量形成)和生理特性(质子释放、柠檬酸分泌和酸性磷酸酶活性增加).外源生长素的施用增加了缺磷白羽扇豆根系的响应度和敏感性.磷和生长素对白羽扇豆根系形态和生理具有明显的交互作用.主成分分析表明,磷解释了根特性64.8%的信息,而生长素解释了21.3%的信息,表明磷供应对白羽扇豆根特性的影响比外源生长素施用更为重要.白羽扇豆能够通过协调根系形态和生理对外部刺激(如缺磷和施用生长素)作出应答,以及优化根形态和生理之间的关系从而最大化获取磷素资源.

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