不同Zn水平下辣椒体内Cd的积累、化学形态及生理特性  

Effect of Different Zinc Levels on Accumulation and Chemical Forms of Cadmium,and Physiological Characterization in Capsicum annuum L.

作　　者：陈贵青[1] 张晓璟[1] 徐卫红[1] 刘吉振[2] 王慧先[1] 郭刘明[1] 陈璐豪[1] 张海波[1] 蓝春桃[1] 曾红军[1] 熊治庭[3] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]重庆市农业科学院蔬菜花卉研究所,重庆401329 [3]武汉大学资源环境学院,武汉430079

出　　处：《环境科学》2010年第7期1657-1662,共6页Environmental Science

基　　金：现代农业产业技术体系建设专项;国家自然科学基金项目(20477032);重庆市自然科学基金项目(CSTC;2009BB7246)

摘　　要：采用盆栽试验研究了重金属Cd(20mg·kg-1)污染下,叶面喷施不同浓度Zn(0、100、200、400、600μmol·L-1)对辣椒生长、叶绿素含量、抗氧化酶活性以及辣椒体内Cd形态和积累量的影响.结果表明,在Zn≤400μmol·L-1范围内,辣椒叶、茎、根、果实干重及叶片叶绿素a、b含量随Zn浓度不断增加而增加;高量Zn(600μmol·L-1)抑制了辣椒的生长、降低了叶片叶绿素含量.在Zn≤400μmol·L-1范围内,辣椒叶SOD和CAT活性随Zn浓度增加而降低,辣椒叶的超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性在400μmol·L-1Zn时达到最低,当Zn>400μmol·L-1时,SOD和CAT活性呈上升趋势.叶面喷施Zn使辣椒茎、根及果实中Cd含量分别降低了2.7%～5.4%、7.5%～28.1%和7.6%～21.8%.与对照相比较,叶面喷施Zn的辣椒果实Cd总提取量、氯化钠提取态Cd、去离子水提取态Cd以及乙醇提取态Cd含量分别降低了7.7%～21.8%、4.11%～23.6%、54.5%～66.8%和4.8%～86.7%,但醋酸提取态和残渣态增加了28.0%～68.0%和12.6%～25.0%.Pot experiments were carried out to investigate the influence of different zinc （Zn） levels （0,100,200,400 and 600 μmol·L-1） on the plant growth,activities of antioxidant enzymes,contents of chlorophyll a and b,accumulation and chemical forms of cadmium （Cd） in Capsicum annuum L.when exposed to Cd （20 mg·kg-1）.The results showed that dry weights of leaf,stem,fruit and root,and contents of chlorophyll a and b in Capsicum annuum L.were increased by Zn （≤ 400 μmol·L-1）,while inhibited by high Zn （600 μmol·L-1）.Activities of superoxide dismutase （SOD） and catalase （CAT） were reduced by Zn （≤400 μmol·L-1）,the lowest activities of SOD and CAT were recorded in 400 μmol·L-1 Zn,but activities of SOD and CAT were increased when Zn400 μmol·L-1.Cadmium concentrations in stem,fruit and root of Capsicum annuum L.were decreased by 2.7%-5.4%,7.5%-28.1% and 7.6%-21.8% in the presence of Zn when exposed to Cd.The total extractable Cd,NaCl-extractable Cd,water-extractable Cd and ethanol-extractable Cd in fruit were reduced by 7.7%-21.8%,4.11%-23.6%,54.5%-66.8% and 4.8%-86.7% in the presence of Zn,while acetic acid-extractable Cd and residual Cd were increased by 28.0%-68.0% and 12.6%-25.0%.

关 键 词：镉-锌拮抗 生理特性 镉累积 镉形态 辣椒 

分 类 号：X173[环境科学与工程—环境科学]