碟果虫实(Corispermum patelliforme)离子吸收与分配对盐胁迫的响应  

Response of Ionic Absorption and Distribution in Different Organs of Corispermum patelliforme to NaCl Stress

作　　者：杨小菊[1] 赵昕[1] 石勇[1] 赵鹏善[1] 李新荣[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所甘肃省寒区旱区逆境生理生态重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2013年第6期1735-1742,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(30770343;41201048)资助

摘　　要：以荒漠地区一年生植物碟果虫实(Corispermum patelliforme)为试验材料,采用营养液培养法研究了不同浓度NaCl盐胁迫对蝶果虫实幼苗含水量及矿质离子在根、茎、叶中的吸收和分配的影响,探讨了碟果虫实耐盐的离子响应机制。结果表明:NaCl浓度为100mmol·L-1时植株含水量比对照有所降低,高于200mmol·L-1时含水量有不同程度的增加,可知碟果虫实以增加植株含水量、稀释盐离子浓度的方式减缓盐离子造成的生理干旱;盐胁迫下随着根系对Na+和Cl-吸收的增加,Si 4+﹑K+﹑Ca2+含量逐渐降低,引起K+/Na+﹑Si 4+/Na+﹑Ca2+/Na+比值显著降低,且地下部分降低的程度显著高于地上部分,因此有利于避免地上部分Si 4+、Ca2+﹑K+缺乏,以维持地上部营养平衡和正常生长;从分析离子选择性的SNa+,K+数据发现,盐胁迫下植株根部拦截了部分Na+,减缓了对地上部分的伤害,叶片对K+吸收具有很好的选择性,对于维持地上部分离子平衡、降低Na+毒害和正常的光合作用具有重要意义。Abstract ： Corispermum patelliforme, an annual wild plant distributed in arid desert areas of the North Chi- na and Mongolia. This paper studied the responses of the relative water content, ion absorption and distribu- tion to different concentration of NaC1 stress. The results indicated that above 200 mmol. L--1 NaC1 concen- tration salt stress enhanced the ability of water absorption of the plant cell. So it could dilute cell＇s salt ion concentration to reduce physiological drought caused by salt ion. With the increasing uptake of Na＋ and CIby roots under salt stress, the Caz＋, K＋ and Si4＋ content decreased gradually. It lead to the ratios of K＋/ Na＋ , Ca2＋/Na＋ and Si4＋/Na＋ in root, stem and leaf of C. patelliforme decreased significantly. And the K＋/Na＋, Ca2＋/Na＋ and Si4＋/Na＋ ratio of underground part roots reduced degree significantly higher than the aboveground parts, so to avoid the ground parts Si4＋, Ca2＋ , K＋ lack, in order to maintain aboveground organs nutrition balance and normal growth. Through analysis SN..K data, it was found that the C. paterme roots retained more Na＋ and prevent Na＋ entering the leaves. Therefore the Na＋ damage on leaves was reduced; The K＋ Selective absorption on leaves of C. patetliforme were strengthened under NaC1 stress, which was significant for keeping iron homeostasis and remain normal photosynthesis in leaves.

关 键 词：蝶果虫实(Corispermum patelliforme) 离子吸收分配 NACL胁迫 

分 类 号：Q945.12[生物学—植物学]