【摘要】 重金属植物提取修复效率受到植物体内重金属含量和植物生物量的影响。利用植物生长调节剂可作为强化植物修复效率的一种调控措施。本实验以芥菜型油菜(Brasscia juncea)和甘蓝型油菜(B.napus)为对象,研究了植物生长调节剂IAA、GA和6-BA单独或两两联合作用对这两种油菜富集镉的调控作用。研究结果显示:这3种植物生长调节剂对这两种油菜株高和生物量的影响不同,显著增加芥菜型油菜株高和生物量,却显著降低甘蓝型油菜株高和生物量。同时,这3种植物生长调节剂可显著提高芥菜型油菜和甘蓝型油菜的镉含量和植物积累镉量,这两种类型油菜积累的镉主要集中在茎和叶。植物生长调节剂处理的芥菜型油菜和甘蓝型油菜的镉转运系数和生物富集系数都大于对照,并且可增强油菜吸收镉和促进镉向茎和叶转移。IAA与GA或6-BA联合作用可协同强化油菜提取镉。更多还原

【Abstract】 Plant biomass production and the metal concentration in the biomass are two essential factors for the practical efficiency of phytoextraction.One alternative strategy to increase phytoextraction efficiency is to use plant growth regulators(PGRs) to enhance contaminant uptake ability of plant species.The effect of indole-3-acetic acid(IAA),gibberellic aid(GA),and 6-benzyladenine(6-BA) on plant growth and Cadmium (Cd) accumulation in seedlings of Brassica juncea and B.napus were studied in a pot experiment with soil contaminated by Cadmium.The results indicated it have different effect on two types of rape in biomass and seeding height which treated used those three types of PGRs.Application of PGRs resulted in significant increased the plant biomass and seedling height for B.juncea.But significant decreased for B.napus.PGRs significantly increased Cd concentration in roots,stem and leaves and Cd accumulation of whole plant for both plant species.Cd accumulation in aboveground parts (include stem and leaves) was much higher than that in roots.Transportation index and bioaccumulation factor for both plant species treated with PGRs were higher than controls.The uptake of Cadmium was mostly increased by exogenous PGRs.The soil to plant and root to stem and leaves transfer of Cadmium was also enhanced by PGRs application.Compared to other treatments,Cadmium phytoextraction efficiency in treatments with a combination of IAA with GA or 6-BA could be much higher than that in other treatments with PGRs.更多还原