向日葵幼苗对Pb、Cu富集能力与耐受性研究

采用室内培养技术研究了向日葵幼苗对Cu、Pb的富集能力与耐受性。结果表明:向日葵幼苗对Pb、Cu具有很强的富集能力,根是主要的富集器官,Cu由根向茎叶运输能力大于Pb。低浓度Pb、Cu刺激了幼苗营养生长;在高浓度条件下,除Pb组外,其它处理均抑制向日葵幼苗的营养生长。Pb、Cu抑制了幼苗根系活力,刺激了幼苗茎叶脯氨酸的生成,改变幼苗茎叶、根蛋白质含量分配水平。Pb与Cu交互作用对幼苗营养生长和生理生化反应具有协同作用。向日葵属于重金属富集植物,对Pb具有很强的耐受性,可以用于修复被Pb污染的土壤。

Studies on Enrichment and Tolerance Ability to Pb,Cu of Sunflower Seedlings

The ability of enrichment and tolerance of sunflower seedlings to Cu,Pb were studied using the indoor culture technique.The results indicated that sunflower seedlings had high ability of enrichment to Cu,Pb,and their roots were main organs of enrichment,moreover the transportation ability of Cu from roots to stems and leaves was better than Pb's.Cu and Pb with low concentration stimulated the nutritive growth of seedlings;but under high concentration,except groups of Pb,other treatments inhibited the nutritive growth of sunflower seedlings.Cu,Pb inhibited activities of seedlings' root systems,stimulated the generation of proline in seedlings' stems and leaves,changed the distribution level of protein contents in the haulm and roots.The interaction of Cu and Pb had synergistic influence on nutritive growth of seedlings and physiological-biochemical reactions.Sunflower belong to the kind of plants that can enrich heavy metals,and it has strong tolerance