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应用生态学报 ›› 2000, Vol. ›› Issue (2): 315-320.

• 研究论文 • 上一篇    

根分泌作用与植物对金属毒害的抗性

常学秀, 段昌群, 王焕校   

  1. 云南大学生物系, 昆明650091
  • 收稿日期:1998-11-30 修回日期:1999-02-01 出版日期:2000-03-25
  • 通讯作者: 常学秀,女,26岁,在读博士研究生,师从王焕校教授(博导).现从事污染生态学及环境毒理学研究,先后参加多项国家及省研究基金项目的研究.已发表论文8篇,参编《污染生态学》高校教材1部.E-mail:Changxx@ynu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(39360020,39760022,39970142)

Root excretion and plant resistance to metal toxicity

CHANG Xuexiu, DUAN Changqun, WANG Huanxiao   

  1. Department of Biology, Yunnan University, Kunming 650091
  • Received:1998-11-30 Revised:1999-02-01 Online:2000-03-25

摘要: 在金属污染物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到根际环境.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际环境的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;通过改变根际微生物的组成、活性和分泌作用而改变根际环境中金属的数量和活度等.本文就国内外根分泌物与植物的金属抗性研究状况作一归纳和评述,并在此基础上提出存在的问题和今后研究的重点、意义.

关键词: 植物, 根分泌物, 金属污染, 抗性

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.

Key words: Plant, Root excretion, Metal pollution, Resistance