【摘要】 以2个转基因陆地棉种质系(ZD-90和SGK3)和陆地棉标准系TM-1为材料,于2009-2010年进行盆栽试验,对镉胁迫下棉花植株不同器官镉的累积、转运和富集特性进行了研究。结果表明,3个棉花种质(系)不同器官镉的累积量随镉胁迫浓度的增加而增加,其中纤维中镉累积量最低,叶柄中镉累积量最高;营养器官镉累积量远高于种子和纤维。各器官累积镉能力的顺序为:纤维<种仁<棉子壳<根<叶片<茎秆<铃壳<叶柄。3个棉花种质(系)各器官的镉转运能力和富集系数与镉累积能力顺序一致,但品种间有显著差异,SGK3和ZD-90的镉累积能力和镉富集系数高于TM-1。棉花具有较强的吸收、转运和聚集重金属镉的能力,体内存在较好的镉运输机制,具备作为超富集植物的基本特征,可以作为超富集植物来治理土壤镉污染。更多还原

【Abstract】 A pot experiment was conducted to study cadmium(Cd) accumulation and distribution,and to explore the phytoremedial capability of cotton for Cd in 2009 and 2010,with three cotton cultivars,ZD-90,SGK3,and TM-1 as materials.ZD-90 is a transgenic glyphosate-tolerant cotton germplasm with EPESP-G6,developed in our laboratory.SGK3 is an insect-resistant cultivar obtained from the Biotechnology Center of the Chinese Academy of Agricultural Sciences.TM-1 is the upland cotton genetic standard line obtained from USDA,ARS,College Station,Texas,USA.We found that petioles had the highest accumulation of Cd,and fiber had the lowest.The ability to uptake and accumulate Cd in different plant parts of the three cultivars while under rising Cd levels can be illustrated by: fiber < seed < seed shell < root < leaf < stem < boll shell < petiole.The translocation ability,bioconcentration factor,and absorbency showed the same order in different organs and increased with Cd concentration.There were significant differences in Cd accumulation and transportation among cultivars,and these were higher in ZD-90 and SGK3 than in TM-1.We believe that cotton has great potential for absorbing and removing Cd from moderately contaminated soils and can be used for the phytoremediation of polluted soils.更多还原