铜处理下节节草耐性机制的探讨  

Tolerance mechanisms of Hippochaete ramosissimum under copper treatment

作　　者：李影[1] 储玲[1] 王友保[1] 

机构地区：[1]安徽师范大学生命科学学院,芜湖241000

出　　处：《生物学杂志》2010年第6期37-41,共5页Journal of Biology

基　　金：国家自然科学基金(30470270);安徽师范大学博士启动基金;安徽省高校生物环境与生态安全省级重点实验室基金;安徽省重要生物资源保护与利用研究省级重点实验室基金

摘　　要：通过盆栽试验研究了外源铜胁迫下节节草对铜的耐性机制。结果表明节节草具有较强的解毒功能,可通过多种途径提高植物对铜的耐受性。钝化根系土壤中Cu2+的生物有效性,降低土壤中交换态铜含量,阻止过量Cu2+进入体内;细胞壁及残渣、含核糖蛋白体的细胞溶质部分是结合铜的主要部位,进一步降低了进入体内的铜含量;进入体内的Cu2+以沉淀或螯合蛋白的形式存在,显著降低铜离子的生物有效性和毒性;SOD和POD在铜处理下节节草细胞活性氧防御机制中起关键作用。Tolerance mechanisms of H.ramosissimum under copper treatment were studied by greenhouse experiment.The results showed that H.ramosissimum had strong detoxication function and it improved the tolerance capacity to Cu in many ways.It decreased the bio-availability of Cu2＋ and reduced remarkably the Cu2＋ content of exchangeable form in rhizosphere soil,which made mass of Cu2＋ hold back.The Cu in plant was found to form certain low dissolvable Cu-compound in order to reduce the toxic effect of Cu2＋ on H.ramosissimum.SOD and POD played an important role in the defensive mechanisms of active oxygen.

关 键 词：节节草 铜处理 耐性机制 

分 类 号：Q945.78[生物学—植物学] X173[环境科学与工程—环境科学]