Jia Weitao, Miao Fangfang, Lv Sulian, Feng Juanjuan, Zhou Shufeng, Zhang Xuan, Wang Duoliya, Li Shizhong, Li Yinxin
Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, PR China.
Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China.
Ecotoxicol Environ Saf. 2017 Nov;145:391-397. doi: 10.1016/j.ecoenv.2017.07.002. Epub 2017 Jul 28.
Cadmium (Cd) pollution is a worldwide environmental problem which heavily threatens human health and food security. Sorghum, as one of the most promising energy crop, has been considered to be the source of high-quality feedstock for ethanol fuel. Ninety-six sorghum genotypes were investigated under hydroponic conditions to compare their capabilities of Cd-tolerance, accumulation and translocation for their potential in remediation of Cd contamination. Different genotypes varied largely in the tolerance to Cd stress with tolerance indexes ranked from 0.107 to 0.933. Great difference was also found in Cd uptake and accumulation with concentrations ranging from 19.0 to 202.4mg/kg in shoots and 277.0-898.3mg/kg in roots. The total amounts of Cd ranked from 6.1 to 25.8μg per plant and the highest translocation factor was over 4 times higher than the lowest one. The correlation analysis demonstrated that Cd concentration in shoot reflected the ability of Cd translocation and tolerance of sorghum, and the path coefficient analysis indicated that root biomass could be taken as a biomarker to evaluate Cd extraction ability of sorghum. The results in this study can facilitate the restoring of Cd contaminated areas by sorghum.
镉（Cd）污染是一个全球性的环境问题，严重威胁着人类健康和粮食安全。高粱作为最具潜力的能源作物之一，被认为是乙醇燃料优质原料的来源。在水培条件下对96个高粱基因型进行了研究，以比较它们对镉的耐受、积累和转运能力，评估其修复镉污染的潜力。不同基因型对镉胁迫的耐受性差异很大，耐受指数在0.107至0.933之间。镉的吸收和积累也存在很大差异，地上部镉浓度范围为19.0至202.4mg/kg，根部镉浓度范围为277.0至898.3mg/kg。每株植物镉总量在6.1至25.8μg之间，最高转运系数比最低转运系数高出4倍多。相关性分析表明，地上部镉浓度反映了高粱对镉的转运能力和耐受性，通径系数分析表明，根生物量可作为评估高粱镉提取能力的生物标志物。本研究结果有助于利用高粱修复镉污染区域。
