外源脱落酸对大麦幼苗镉胁迫伤害的影响  

Influence of Exogenous ABA on Hordeum vulgare seedling Damage under Cd Stress

作　　者：李晓科[1] 张义贤[2] 

机构地区：[1]晋中学院生物科学与技术学院,山西晋中030600 [2]山西大学生命科学与技术学院,山西太原030006

出　　处：《山西农业科学》2012年第1期18-20,共3页Journal of Shanxi Agricultural Sciences

摘　　要：采用室内培养法,研究了外源脱落酸对重金属镉(Cd)胁迫下大麦幼苗叶片细胞膜透性(CMP)、丙二醛(MDA)含量、超氧化物歧化酶(SOD)和过氧化物酶(POD)活性的影响。结果表明,大麦幼苗叶片细胞膜透性(CMP)和丙二醛(MDA)含量随重金属镉(Cd)质量浓度的增加而上升,且在重金属镉(Cd)为10 mg/L(T2)时,MDA含量和CMP与对照达极显著差异;SOD和POD活性表现为先上升后下降的趋势,在Cd2+质量浓度为100 mg/L(T3)时,SOD和POD的活性低于对照,可能已经失活。对重金属镉T2处理的幼苗使用外源脱落酸(ABA)后,可以显著提高其叶片SOD和POD活性,极显著降低叶片细胞膜透性和丙二醛含量,说明使用外源脱落酸能够减轻重金属胁迫对大麦幼苗的伤害。Effect of exogenous ABA on Hordeum vulgare seedling damage under Cd stress was studied by present indoor cultivation experiments, including the cellular membrane permeability （CMP）, malondialdehyde （MDA） content, superoxide dismutase （SOD） and peroxidase （POD） activities. The results showed that the cellular membrane permeability （CMP） and malondialdehyde （MDA） content of H. vulgare seedling leaves increased significantly, difference between CK was very distinct when the seedlings were under T2 heavy metal Cd stress; superoxide dismutase （SOD） and peroxidase （POD） activities increased first and decreased later, their activities might He lost when the seedlings were under T3 heavy metal Cd stress. At the mean time, after using exogenous abscise acid on the treatment of T2 heavy metal Cd, SOD and POD activities in the leaf of H. vulgare seedling increased, CMP and MDA content decreased significantly. Therefore, use of exogenous abscise could alleviate the injury of H. vulgare seedling under heavy metal stress.

关 键 词：大麦 重金属 外源脱落酸 抗氧化酶 

分 类 号：S512.301[农业科学—作物学]