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

作　　者：王玮琳 刘清泉[1] 张永侠[1] 王银杰 原海燕[1] 黄苏珍[1] WANG Weilin;LIU Qingquan;ZHANG Yongxia;WANG Yinjie;YUAN Haiyan;HUANG Suzhen(Institute of Botany, Jiangsu Province and ChineseAcademy of Sciences, Nanjing 210014, China)

机构地区：[1]江苏省中国科学院植物研究所(南京中山植物园)

出　　处：《植物资源与环境学报》2019年第2期57-63,共7页Journal of Plant Resources and Environment

基　　金：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)

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。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, He’nan, 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 

分 类 号：Q945.78[生物学—植物学] S682.19[农业科学—观赏园艺]