紫外光对几种水生植物过氧化氢酶(CAT)活性的影响

通过测定被照射植物分解过氧化氢后放出氧气的体积,确定植物过氧化氢酶(CAT)的活性。结果表明,满江红,浮萍和水花生3种植物受过量紫外光不同时间照射,CAT活性都明显升高。但活性峰值因植物不同而异,即满江红的CAT峰值出现在被照射72h后;浮萍的CAT峰值出现在被照射24h后;水花生则出现在被照射8h后。撤除过量紫外光照射后,3种植物的CAT活性逐渐降低。说明过量紫外光对3种植物的CAT活性有刺激作用,同时又使植物体组织受到损害,最终导致植物的CAT活性降低,而且不同植物对过量紫外光的效应是不同的。

The Effects of the UV Light on the Catalase(CAT) Activity of Several Species of Aquatic Plants

By testing the volume of O2 which is released after the CAT of the plants exposed to exceeded UV decomposed H2O2 ,the CAT activity of the exposed plants is determined. The results show that the CAT activities for three plant species, Azolia imbricata.Lemna minor, Alternanthera philoxeroides, obviously rose respectively after they had been exposed to exceeded UV in defferent hours. But the maximum values of the CAT activities for three plant species is vary with defferent species. There is a maximum value of the CAT activity for Azolia imbricata which is exposed to exceeded UV in 72 hours. There is a maximum value of the CAT activity for Lem-na minor which is exposed toexceeded UV in 24 hours. There is a maximum value of the CAT activity for Alternanthera philoxeroides which is exposed to the exceeded UV in 8 hours. The CAT activities for three plant species decreased respectively in some hours after the influence of the UV had been withdrawn. This shows that there obviously are stimulative affects of the exceeded UV on the CAT active for three plants. Meanwhile,the tissues and metabolism of the exposed plants are injured by the exceeded UV. It finally leads up to decrease the CAT activity of the exposed plants. The ecological effects of various plant species on the exceeded UV are defferent.