2024年6月17日 星期一
不同种源马蔺幼苗对Cd耐性及积累特性的差异分析
Analysis on differences in tolerance and accumulation characteristics of Cd of Iris lactea var. chinensis seedlings from different provenances
2019年 第28卷 第2期 页码[57-63]    下载全文[0.9MB]  
摘要

采用水培法对不同浓度(0、25和50 mg·L-1)Cd胁迫下4个种源(辽宁、山东、河南和江西)马蔺〔Iris lactea var. chinensis (Fisch.) Koidz.〕幼苗生长和Cd积累特性进行了分析。结果表明:随着Cd浓度的提高,同一种源马蔺幼苗的株高、根长以及地上部和根系的鲜质量和干质量的相对值总体上呈逐渐减小的趋势。25和50 mg·L-1 Cd处理下,辽宁种源马蔺幼苗的株高、根长以及地上部和根系的鲜质量和干质量的相对值总体上较高。随着Cd浓度的提高,辽宁种源马蔺幼苗地上部和根系中Cd含量明显升高;山东、河南和江西种源马蔺幼苗地上部中Cd含量不同程度降低,根系中Cd含量明显升高。马蔺幼苗根系中Cd含量远高于地上部中Cd含量,说明马蔺幼苗中的Cd主要积累在根系。50 mg·L-1 Cd处理下,辽宁种源马蔺幼苗的Cd转运系数和生物富集系数总体上显著大于山东、河南和江西种源。综合研究结果显示:辽宁种源马蔺幼苗的Cd耐性以及Cd转运能力和富集能力均较强,可作为Cd污染环境的修复材料。

Abstract

Growth and Cd accumulation characteristics of Iris lactea var. chinensis (Fisch.) Koidz. seedlings from four provenances (Liaoling, Shandong, He,nan, and Jiangxi) under different concentrations (0, 25, and 50 mg·L-1) of Cd stress were analyzed by using hydroponic method. The results show that with enhancing of Cd concentration, relative values of height, root length, and fresh and dry masses of aboveground part and root of I. lactea var. chinensis seedlings from the same provenance show a tendency to gradually decrease in general. And under the treatments of 25 and 50 mg·L-1 Cd, those of I. lactea var. chinensis seedlings from Liaoning provenance are relatively high in general. With enhancing of Cd concentration, Cd content in above-ground part and root of I. lactea var. chinensis seedlings from Liaoning provenance increases evidently; Cd content in above-ground part of I. lactea var. chinensis seedlings from Shandong, He,nan, and Jiangxi provenances decreases with different degrees, and that in root increases obviously. Cd content in root of I. lactea var. chinensis seedlings is much higher than that in above-ground part, indicating that Cd in I. lactea var. chinensis seedlings is mainly accumulated in root. Under the treatment of 50 mg·L-1 Cd, translocation factor and bio-concentration factor of Cd of I. lactea var. chinensis seedlings from Liaoning provenance are significantly greater than those of seedlings from Shandong, Henan, and Jiangxi provenances in general. The comprehensive research results show that Cd tolerance and abilities of translocation and enrichment of Cd of I. lactea var. chinensis seedlings from Liaoning provenance are relatively strong, which can be used in phytoremediation of Cd contaminated environment.

关键词马蔺; 种源; Cd耐性; 转运系数; 生物富集系数
Key wordsIris lactea var. chinensis (Fisch.) Koidz.; provenance; Cd tolerance; translocation factor; bio-concentration factor
作者王玮琳, 刘清泉, 张永侠, 王银杰, 原海燕, 黄苏珍
所在单位江苏省中国科学院植物研究所(南京中山植物园), 江苏 南京 210014
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下载次数920
基金项目国家自然科学基金资助项目(31572196); 江苏省自然科学基金资助项目(BK20180317); 江苏省植物资源研究与利用重点实验室开放基金(JSPKLB201843)