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根分泌作用与植物对金属毒害的抗性
引用本文:常学秀,段昌群,王焕校.根分泌作用与植物对金属毒害的抗性[J].应用生态学报,2000,11(2):315-320.
作者姓名:常学秀  段昌群  王焕校
作者单位:云南大学生物系,昆明,650091
基金项目:国家自然科学基金资助项目 !(39360020,39760022,39970142)
摘    要:在金属污染进入体内之前将其有效性和毒性降低是植物的主要抗金属机制之一,根系是金属等土壤污染物进入植物的门户,它能分泌有机酸、氨基酸,糖、生长物质等根分泌物与根际环境,根分泌物在植物吸收金属的过程中影响很大,它们可以通过改变根球环境的PH、Eh等物理、化学性质而影响根系对金属的吸收;通过螯合、络合,沉淀等作用将金属污染物滞留于根外;通过改变根际微生的组织,活性和分泌作用而改变根际环境中金属的数量和活

关 键 词:植物  根分泌物  金属污染  抗性  有效性  毒性
修稿时间:1998-11-30

Root excretion and plant resistance to metal toxicity
CHANG Xuexiu,DUAN Changqun,WANG Huanxiao.Root excretion and plant resistance to metal toxicity[J].Chinese Journal of Applied Ecology,2000,11(2):315-320.
Authors:CHANG Xuexiu  DUAN Changqun  WANG Huanxiao
Institution:Department of Biology, Yunnan University, Kunming 650091. Changxx@ynu.edu.cn
Abstract:Reducing the availability and toxicity of metal pollutants before they enter plant body is one of the main mechanisms of plant resistance to metals.Root system is the first entrance of metal pollutants from soil into plant.It can excrete organic acids,amino acids,sugars,growth substances etc.into rhizosphere.Root excretion affects the metal absorption by plant through changing the physical and chemical characters(such as pH,Eh)of rhizosphere.The metal pollutants are detained outside the roots by chelation,complexation and disposition with root exudates.The quantity and activity of metals in rhizosphere are changed by root exudates through changing the composition,activity and excretion of microbes there.After reviewing the research advances on root excretion and plant resistance to metals,the authors pointed out the existing problems and the major topics and significance of further research.
Keywords:Plant  Root excretion  Metal pollution  Resistance  
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