重金属对大豆种子萌芽及在幼苗中迁移的影响  

Effect of Heavy Metals on Seed Germination and Seedling Growth of Soybean and Accumulation of Heavy Metals in Soybean Seedlings

作　　者：陈明君[1] 傅杨武[1] 周群英[1] 潘杰[1] 

机构地区：[1]重庆三峡学院化学与环境工程学院,重庆万州404000

出　　处：《贵州农业科学》2010年第9期213-216,共4页Guizhou Agricultural Sciences

基　　金：重庆市教委科学技术项目"重金属污染物在消落带土壤-水体系统中的迁移模型研究"(KJ101116);重庆三峡学院教学改革项目"化学化工实验教学体系改革"(10ZZ-017)

摘　　要：为探索重金属对大豆发芽、幼苗生长的影响及在根、茎、子叶中的迁移积累规律,以大豆为材料,采用无土栽培法研究了重金属Cu2+、Zn2+、Pb2+单一及复合处理对大豆种子萌芽、幼苗生长的影响和各重金属离子在大豆幼苗中的迁移情况。结果表明:1)单一处理重金属离子浓度Cu2+≤25.0 mg/L、Zn2+≤25.0 mg/L和Pb2+≤10.0 mg/L时,大豆种子的发芽率和发芽势均高于空白试验,外源重金属低浓度对大豆发芽、幼苗的生长有利,高浓度有抑制作用。复合处理显示,Cu2+、Zn2+、Pb2+之间对大豆种子萌发和大豆幼苗的生长存在协同效应。2)外源重金属单一处理时随浓度的增加积累量增大,迁移富集量表现为根>茎>子叶。复合处理时重金属离子在根、茎、子叶中的迁移富集量表现为根>茎>子叶,重金属离子对共存离子在幼苗根中的吸收和向茎、子叶迁移的量因共存离子不同而不同。The soybean seeds under single and complex Cu2＋,Zn2＋ and Pb2＋ stress were tested in soil cultivation to study the effects of heavy metals on seed germination,seedling growth and accumulation of heavy metals in soybean seedlings.The results showed that 1） the seed germination rate and vigor of soybean seeds treated with ≤25.0mg/L Cu2＋ or ≤25.0mg/L Zn2＋ or ≤25.0mg/L Pb2＋ were higher than CK,the lower exogenous heavy metal concentration was beneficial to seed germination and seedling growth but high exogenous heavy metal concentration had inhibition effects on seed germination and seedling growth,and the complex Cu2＋,Zn2＋ and Pb2＋ stress had synergistic effect on seed germination and seedling growth,2） the heavy metal accumulation in soybean seedlings increased with the increase of heavy metal stress in the single heavy metal test,the accumulation of heavy metals in soybean seedlings was rootstemcotyledon in the single and complex heavy metal tests,the coexist ions accumulation in seedling roots,stem and cotyledon was different with different coexist ion combination.

关 键 词：Cu2+ Zn2+ PB2+ 大豆 萌芽 离子迁移 

分 类 号：S565.1[农业科学—作物学]