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钙对盐胁迫下棉苗离子吸收分配的影响

郑青松, 王仁雷, 刘友良

南京农业大学农业部作物生长调控重点实验室.江苏,南京 210095

摘要

研究了钙对NaCl胁迫下棉花幼苗体内离子分布的影响及其与根系质膜H~(+)-ATP酶、液泡膜H~(+)-ATP酶和H~(+)-PP酶活性的关系。不同器官离子含量和根系横切面X-射线微区分析结果表明,NaCl胁迫下外源钙明显减少棉花幼苗对Na~(+)的吸收及其向茎杆、叶片的运输,增加对K~(+)和Ca~(2+)的吸收及其向茎杆、叶片的运输,增强棉苗体内的盐分区域化分配,提高根冠比和干物质积累,根系电解质渗漏率下降。钙明显提高盐胁迫下幼根细胞质膜H~(+)-ATP酶、液泡膜H~(+)-ATP酶和H~(+)-PP酶的活性,与钙调节棉花对离子的吸收、分配相一致,说明这些酶可以为根细胞中的Na~(+)在液泡中积累以及K~(+)、Ca~(2+)的选择性吸收和运输提供动力。

关键词： NaCl胁迫; 棉苗; 钙; 离子吸收和分配

Effects of Ca~(2+) on absorption and distribution of ions in salt-treated cotton seedlings

Zheng Qingsong, Wang Renlei, Liu Youliang

Key Lab of Crop Growth Regulation,Ministry of Agriculture,Nanjing Agricultural University.Nanjing 210095,Jiangsu

Abstract

The results of ion contents in different organs and X-ray microanalysis indicated that addition of supplemental Ca~(2+) to the medium decreased Na~(+) absorption and transport to the shoots and leaves, increased K~(+) and Ca~(2+) absorption and transport, enhanced salt regionalisation in body, increased root/shoot ratio and accumulation of dry matter, accelerated growth in NaCl-treated cotton seedlings. It is in consistent with the results that Ca~(2+) regulates ion absorption and distribution via its enhancement of these H~(+)-ATPase and H~(+)-pyrophosphatase activities. It suggests that these enzymes may provide driving force for accumulating of Na~(+) in the vacuoles of roots and the selective absorption and distribution of K~(+), Ca~(2+).

Key words: NaCl stress;Cotton seedling;Calcium;Ion absorption and distribution

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引用本文：

郑青松, 王仁雷, 刘友良. 钙对盐胁迫下棉苗离子吸收分配的影响[J]. 生理学报 2001; 53 (4): .

Zheng Qingsong, Wang Renlei, Liu Youliang. Effects of Ca~(2+) on absorption and distribution of ions in salt-treated cotton seedlings. Acta Physiol Sin 2001; 53 (4): (in Chinese with English abstract).