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镉胁迫下红树植物木榄幼苗的生理生化特性

陶毅明;陈燕珍;梁士楚;梁杨琳   

  1. 广西师范大学生命科学学院, 广西桂林 541004
  • 收稿日期:2007-07-27 修回日期:1900-01-01 出版日期:2008-05-10 发布日期:2008-05-10

Physiological and biochemical properties of Bruguiera gymnorrhiza seedlings under cadmium stress.

TAO Yi-ming;CHEN Yan-zhen; LIANG Shi-chu;LIANG Yang-lin   

  1. College of Life Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China
  • Received:2007-07-27 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10

摘要: 用含CdCl2的Hoagland营养液处理了沙培中的木榄(Bruguiera gymnorrhiza)幼苗。2个月后对幼苗丙二醛(MDA)、叶绿素含量、过氧化物酶(POD)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性及其同工酶进行分析。结果表明,镉引起幼苗膜质过氧化,导致总叶绿素含量显著下降。镉主要影响迁移率大的阴离子型POD同工酶的活性。1 mmol·L-1 镉-显著抑制根中2条CAT同工酶RC1和RC2的活性。木榄根CAT和叶POD同工酶分析可作为红树林镉污染的监测手段之一。

关键词: 森林资源清查资料, 森林生物量, 模型

Abstract: In a sand culture experiment, Bruguiera gymnorrhiza seedlings were treated with Hoagland nutrient solution containing different concentrations of CdCl2. After two months later, the lipid peroxidation, chlorophyll content, and activities of peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) and their isoenzymes in the seedlings were analyzed. The results showed that Cd induced the peroxidation of membrane lipid, resulting in a significant decrease of chlorophyll content. Cd mainly affected the activities of the POD isoenzymes with negative ions and higher mobility, and 1 mmol Cd·L-1 could significantly inhibit the activities of CAT isoenzymes RC1 and RC2 in the root. It was suggested that the analysis of POD isoenzyme in B. gymnorrhiza leaf and of CAT isoenzyme inB. gymnorrhiza root could be used to monitor the Cd pollution of mangrove.

Key words: Forest inventory data, Forest biomass, Model