PEG对Cd胁迫下水稻幼苗抗氧化酶活性的影响  

Influence of PEG pretreatment on antioxidant enzyme activities of rice seedling to subsequent Cd stress

作　　者：张诗婉 梅映学 魏玮[1] 孙栋婉 苏昕[1] 王茜[1] 马莲菊[1] 

机构地区：[1]沈阳师范大学化学与生命科学学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2015年第3期437-441,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(31270369);沈阳师范大学主任基金资助项目(EERC-K-201406);沈阳师范大学"大学生创新创业训练计划"项目

摘　　要：通过对Cd胁迫下水稻幼苗叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)等抗氧化酶活性、MDA含量及株高的研究,以及外源干旱预处理对这些参数的影响,来探讨干旱预处理对Cd胁迫下水稻幼苗抗氧化酶活性等生理指标的影响。结果表明:Cd处理使水稻幼苗株高降低,但PEG预处理却能够使水稻幼苗株高显著增加(P<0.05)。随着Cd处理时间的延长,水稻幼苗叶片MDA含量明显增加(P<0.05),PEG预处理则可以减少MDA含量。同时Cd处理还降低了水稻幼苗叶片中SOD、POD、CAT和APX的活性;经过PEG预处理的水稻幼苗叶片的SOD、POD、CAT、APX活性均显著高于Cd处理组(P<0.05)。PEG预处理可诱导水稻幼苗对随后的Cd胁迫产生交叉适应,以减轻Cd胁迫对水稻幼苗造成的伤害。Effects of PEG pretreatment were studied on rice seedling growth and antioxidative activities of rice seedling stressed by Cd.The result indicated that Cd treatment reduced rice seedling＇s height compared to the control,but the PEG pretreatment increased the rice seedling＇s height compared to the Cd treatment.With the prolong of Cd treatment time,MDA content of the rice seedling leaves increased significantly,but PEG pretreatment reduced MDA content.Cd treatment also reduced the activities of SOD,POD and CAT and APX of the rice seedling leaves.Under PEG pretreatment,the activities of SOD,POD and CAT and APX of the rice seedling leaves were significantly increased in comparison with that of Cd treatment.PEG pretreatment induced rice seedlings cross adaptation on the subsequent Cd stress and alleviated the Cd stress on rice seedlings.

关 键 词：PEG预处理 镉 水稻幼苗 抗氧化酶 交叉适应 

分 类 号：Q945.78[生物学—植物学]