Cr6＋污染对水鳖的叶绿素含量和几种酶活性的影响

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.