稀土金属离子对蚕豆根尖微核率及对蚕豆早期生长发育的影响  

Effects of Rare Earth Element Ions on Micronucleus Frequency in Root Tip Cell and Early Growth of Vicia Faba

作　　者：孔志明[1] 王永兴[1] 吴庆龙 钟远[1] 王晓蓉[1] 

机构地区：[1]南京大学环境科学与工程系土壤控制与资源化研究国家重点实验室

出　　处：《农业环境保护》1998年第3期97-100,共4页Agro-Environmental Protection

基　　金：国家自然科学基金

摘　　要：应用蚕豆初生根尖细胞微核技术研究Ｌａ３＋、Ｓｍ３＋、Ｙ３＋、Ｇｄ３＋等稀土金属离子的诱变性，发现稀土金属离子在达到一定剂量时均可引起蚕豆根尖细胞微核率的升高，与对照组相比差异显著（Ｐ＜０．０５，Ｐ＜０．０１）。在早期生长试验中，应用７ｄ生长的蚕豆幼苗干重表征蚕豆的早期生长情况，比较蚕豆的发芽率及幼苗干重，反映稀土金属离子对蚕豆早期生长发育的毒性。结果表明，稀土金属离子在高浓度时对蚕豆的发芽率有一定影响，其中以Ｓｍ３＋、Ｙ３＋、Ｇｄ３＋更为明显；从蚕豆幼苗干重可以看出，稀土离子在低浓度时对蚕豆早期生长具有刺激作用，并具最适浓度，在高浓度时均具有抑制作用，且随着浓度的升高，抑制作用增强。Mutagennicity of rare earth element(REE) ions La3+, Sm3+, Y3+ and Gd3+ was evaluated with micronucleus test in vicia faba root tip cells. REE ions at certain concentrations induced micronucleus formation significantly (P<0.05, P<0.01). The germination rate and the dry weight of 7-day-old seedling were used as indexes to represent the effects of REE ions on the growth of vicia faba. The germination rates of vicia faba seed were inhibited at high concentrations ( 16 and 12mmol/L) of Sm3+, Y3+ and Gd 3+ . The average seedling dry weights were stimulated at low REE ion concentrations, but inhibited in high concentrations. As the concentrations of REE ions became higher, the inhibitory effect increased.

关 键 词：稀土金属离子 蚕豆 发芽率 生长发育 土壤污染 

分 类 号：X530.323.1[环境科学与工程—环境工程]