Cadmium (Cd) Localization in Tissues of Cotton (Gossypium hirsutum L.), and Its Phytoremediation Potential for Cd-Contaminated Soils
Cadmium (Cd) Localization in Tissues of Cotton (Gossypium hirsutum L.), and Its Phytoremediation Potential for Cd-Contaminated Soils
复制标题
DOI：
10.1007/s00128-015-1662-x
复制
发表时间：
2015-12-01
影响因子：
2.7
通讯作者：
Yang, Yujie
中科院分区：
文献类型：
--
作者：
Chen, Zhifan;Zhao, Ye;Yang, Yujie
利用经济价值高、生物量大、不可食用的植物修复重金属污染土壤是一种很有前途的方法。本研究通过分析不同土壤Cd水平下棉花对Cd的生物富集和器官定位，研究了棉花对Cd的耐性和修复潜力。结果表明，当土壤镉含量为20.26mg·kg-1时，棉花表现出较好的耐性。在低Cd水平（< 1.26 mg kg（-1））下，棉花对Cd有较好的积累能力，其TF值（茎根Cd浓度比）大于1。能量色散X射线微区分析表明，棉花叶片蒸腾作用对土壤Cd的提取起着关键作用，而根和茎是土壤Cd的主要贮存部位。根和干细胞汁液中镉与其他有机成分的络合可能是主要的解毒策略。因此，棉花是Cd污染土壤植物修复的潜在候选者。
Phytoremediation using economically valuable, large biomass, non-edible plants is a promising method for metal-contaminated soils. This study investigated cotton's tolerance for Cd and remediation potential through analyzing Cd bioaccumulation and localization in plant organs under different soil Cd levels. Results showed cotton presents good tolerance when soil Cd concentration a parts per thousand currency sign20.26 mg kg(-1). Cotton had good Cd accumulation ability under low soil Cd levels (< 1.26 mg kg(-1)), with a TF value (the ratio of Cd concentration in stem to root) above 1. Energy dispersive X-ray microanalysis indicated cotton leaf transpiration played a key role in extracting soil Cd, while roots and stems were the main compartments of Cd storage. Cd complexation to other organic constituents in root and stem cell sap could be a primary detoxifying strategy. Therefore, cotton is a potential candidate for phytoremediation of Cd-contaminated soils.