KCl处理对毕氏海蓬子生长和抗氧化酶活性的影响  

Effect of KCl Treatments on Growth and Antioxidant Enzyme Activity of Salicornia bigelovii

作　　者：周峰[1] 张边江[1] 陈全战[1] 华春[1] 

机构地区：[1]南京晓庄学院生命科学系,南京211171

出　　处：《湖北农业科学》2008年第3期315-318,共4页Hubei Agricultural Sciences

基　　金：江苏省高校自然科学基础研究面上项目(07KJD180126);南京晓庄学院人才引进科研项目(2006NXY42);南京晓庄学院生态学重点建设学科项目

摘　　要：研究了KCl处理对盐生植物毕氏海蓬子生长和抗氧化酶活性的变化。结果表明,低浓度KCl(0,1和6 mmol·L-1)处理显著促进了海蓬子生长和抗氧化酶系统中的超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)的活性。而高浓度的KCl(50和100 mmol·L-1)却明显抑制了海蓬子的生长,SOD、POD和CAT的活性也受到抑制,超氧阴离子(O2.-)和丙二醛(MDA)含量增加程度明显高于低浓度的KCl处理。高浓度KCl处理伤害海蓬子的原因之一是抗氧化酶活性降低,不能及时将活性氧类清除,从而导致活性氧及MDA积累,引起质膜伤害,使海蓬子生长量降低。Salt-dilution halophyte Salicornia bigelovii were treated with different concentration of KCl. The results demonstrated that KCl treatment at low concentration （0, 1 and 6 mmol.L^-1） significantly enhanced growth, superoxide dismutase （SOD）, peroxidase （POD） and calatase （CAT） activities of S. bigelovii . While growth of S. bigelovii were markedly decreased when the plants were treated with KCl at high concentration （50 and 100 mmol.L^-1）. The treatment of KCl at high concentration led to the decrease of SOD, POD and CAT activities. The superoxide anion （02-） content and malondialdehyde （MDA） content were increased markedly under high KCl concentration treatment contrast with KCl at low concentration. The results suggested that one of reasons for KCl toxicity at high concentration was that the system of antioxidant enzyme could not scavenge the reactive oxygen species in time,which caused the accumulation of reactive oxygen species and the damage of membrane,and in turn caused the accumulation of MDA, so growth of S. bigelovii was inhibited.

关 键 词：毕氏海蓬子 KCL 生长 抗氧化酶 

分 类 号：Q949.745.1[生物学—植物学] Q945.78