Cr^(6+)、Pb^(2+)污染对水稻幼苗生长发育的影响  

Effects of Chromium and Lead Pollution on Growth and Development of Rice Seedling

作　　者：邹继颖[1] 刘辉[1] 

机构地区：[1]吉林化工学院环境与生物工程学院,吉林吉林132022

出　　处：《河南农业科学》2014年第2期31-34,共4页Journal of Henan Agricultural Sciences

基　　金：吉林化工学院科学技术研究项目(2011051)

摘　　要：利用水培法研究不同质量浓度Cr6+(0、0.05、0.15、0.25、0.35、0.45、0.55mg/L)和不同质量浓度Pb2+(0、0.05、0.10、0.15、0.25、0.35、0.50mg/L)对水稻幼苗生长发育的影响,以期为研究重金属污染对水稻种子萌发及早期幼苗伤害机理提供一些理论参考。结果表明,Cr6+对水稻幼苗的生长表现为低(≤0.25mg/L)促高(>0.25mg/L)抑,并且这种抑制作用随着其质量浓度的增加而增大;Cr6+对水稻幼苗叶绿素含量的影响也表现为低促高抑;水稻幼苗体内Cr6+含量以较大苗龄的较高,且其随着培养液中Cr6+质量浓度的增加而增加。Pb2+对水稻幼苗的生长表现为低(≤0.15mg/L)促高(>0.15mg/L)抑,且其质量浓度越大抑制作用越强;Pb2+对水稻幼苗叶绿素含量的影响也表现为低促高抑,且水稻幼苗苗龄越大,其对Pb2+污染的抵抗力越差;水稻幼苗体内Pb2+含量以较大苗龄的较高,但相同苗龄水稻体内Pb2+含量与培养液中Pb2+质量浓度呈反比。In order to analyze the damage mechanism of Cr6＋ and Pb2＋ on seed germination and initial growth of rice seedlings, the hydroponic method was used to study the effect of different concentrations of Cr6＋ （0,0.05,0.15,0.25,0.35,0.45,0.55 mg/L） and Pb2＋ （0,0.05,0.10, 0. 15,0. 25,0. 35,0. 50 mg/L） on the growth and development of rice seedlings. The results showed that the growth of rice seedlings was promoted by Cr6＋ at low concentrations（〉0. 25 mg/L）, but inhibited by Cr6＋ at high concentrations（〉0. 25 mg/L）, and the inhibition effect increased with the increase of Cr6＋ concentrations. The content of chlorophyll was also promoted by Cr6＋ at low concentrations and inhibited by Cr6＋ at high concentrations. Older rice seedlings accumulated more Crs＋ ,and the content of accumulated Cr6＋ increased with the increase of Cr6＋ concentrations. The growth of rice seedlings was promoted by Pb2＋ at low eoneentrations（≤0. 15 mg/L）, but inhibited by pb2＋ at high concentrations（〉0. 15 mg/L）, and the inhibition effect increased with the increase of Pb2＋ concentrations. The content of chlorophyll was also promoted by Pb2＋ at low concentrations and inhibited by Pb2＋ at high concentrations,and with the increase of age,the immunity of rice seedlings to Pb2＋ decreased. High content of accumulated Pb2＋ was found in older seedlings,however, the accumulated Pb2＋ content in rice seedlings at the same age was inversely proportional to Pb2＋ concentrations.

关 键 词：铬 铅 水稻 叶绿素 生长发育 

分 类 号：X173[环境科学与工程—环境科学] S511[农业科学—作物学]