文章基本信息

标题：ROLE OF THE NON-PROTEIN THIOLS IN ACCUMULATION, TRANSLOCATION AND TOLERANCE OF LEAD IN Iris lactea var. chinensis
本地全文：下载
作者：Zhi Guo ; Chun-Sun Gu ; Yong-Heng Yang 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2015
卷号：24
期号：3A
页码：959-969
语种：English
出版社：PSP Publishing
摘要：The effect of exogenous glutathione (GSH) and L-buthionine-S,R-sulphoximine (BSO, an inhibitor of GSH and phytochelatin (PCs) synthesis) on lead (Pb) accumulation, translocation and growth of Iris lactea var. chinensis under Pb stress were investigated. The addition of 150 mg·L-1 GSH obviously enhances Pb accumulation and translocation to shoots in I. lactea var. chinensis compared with the single Pb stress and BSO addition. The growth inhibitions were not intense after GSH treatment, even though Pb kept high accumulation in roots and shoots, suggesting that Pb may be effectively detoxified under Pb together with GSH treatment. The cell ultrastructural examination of Pb in I. lactea var. chinensis supported the facts that exogenous application of GSH may alleviate Pb harm. In order to clarify the role of non-protein thiols (NPTs) in Pb toxicity, accumulation and translocation, the dynamic variations of Pb contents and NPT synthesis of PCs, GSH and cysteine (Cys) in I. lactea var. chinensis were analyzed under Pb (100-500 mg·L-1) treatment for 1-7 days. PC2 formation could be induced only in the roots, and the contents in roots enhanced gradually with increasing Pb concentrations in solutions and exposure time. The concentrations of shoot GSH also enhanced gradually, but GSH in roots showed a slight decline when exposed to 300 and 500 mg·L-1 Pb after 4 and 7 days. Cys showed induction at lower Pb level and initial stress, followed by decline. The correlation analysis between Pb accumulation and the synthesis of NPTs suggested that Pb in the roots of I. lactea var. chinensis may mainly be detoxified through chelation with PC2. while GSH may mainly serve as the role of promoting and transporting Pb to aboveground and detoxification.
关键词：Non-protein thiols; lead; sub-cellular localization; tolerance; Iris lactea var. chinensis