Cr^(6+)污染对水鳖的叶绿素含量和几种酶活性的影响

The Study of Cr 6+ Pollution Affecting Chlorophyll and Activity of Enzymes in Hydrocharis dubia (B l)Backer

主要研究Ｃｒ６＋污染对水鳖的外部形态及叶绿素含量、过氧化物酶活性、硝酸还原酶活性等生理指标的影响．Ｃｒ６＋对水鳖毒害结果显示是抑制其对水分的吸收，在８～３２μｇ／ｇ范围内毒害程度与处理时间和浓度呈正相关．在高浓度时短期处理的叶边缘开始出现干枯，根尖腐烂．在短期内４μｇ／ｇ，８μｇ／ｇ的Ｋ２Ｃｒ２Ｏ７能提高水鳖叶中叶绿素的含量，而１６μｇ／ｇ，３２μｇ／ｇ的Ｋ２Ｃｒ２Ｏ７则降低叶中叶绿素的含量．过氧化物酶活性则随着处理浓度的升高而升高．硝酸还原酶的活性在短期内４μｇ／ｇ最高，８μｇ／ｇ也略高于对照．１６μｇ／ｇ。

This paper mainly deals with the external morphology,the activity of peroxidase,nitrate reductase and the content of chlorophyll The results showed the reason of Cr 6+ damaging Hydrocharis dubia (B l)Backer was that Cr 6+ prevented Hydrocharis dubia(B l)Backer from absorbing water,the damaging degree is positively relative to the cultural concentration and time.In the high concentration of Cr 6+ the edge of leaves began to dry,root tip rotted in short period The content of chlorophyll of leaves in the solution of 4μg/g,8 μg/g rised in the first few days,but it was reduced in 16μg/g,32μg/g The activity of peroxidase enhanced with the raising concentration of Cr 6+ .The activity of nitrate reductase is the highest in 4μg/g,and a little high er than control class in 8μg/g,reduced in 16μg/g,32μ g/g.