稀土铽对辣根的生态毒性

研究了稀土铽(Tb)对辣根生理毒性的影响。结果表明,Tb在低浓度范围内,可以诱导叶绿素的合成,高浓度时对其产生破坏作用;对于辣根过氧化物酶,酶活性先升后降;质膜透性、丙二醛含量则呈现先减后增的变化趋势。TbCl3浓度为3mg/kg时各指标达到最值;辣根中毒阈限为10mg/kg左右。通过分析,辣根过氧化物酶对Tb反应敏感,这表明过氧化物酶可能成为研究稀土毒理的生物监测手段。

Study on toxicity effects of terbium on horseradish

Toxicity effects of terbium on horseradish growth were studied.The results show that the chlorophyll can be induced at the low concentration of Tb3 ,and destroyed as the increasing of Tb3 concentration.Tb3 can induce rise of the activity of horseradish peroxidase(HRP)at lower concentration,and decrease at high concentration.However,the permeability and MDA content appear first decrease and then increase trend.When the concentration is 3mg/kg,all the indexes reach the maximum or minimum;for horseradish,the threshold limit is about 10mg/kg.By the analysis of significance of the index difference,HRP is most sensitive to Tb3 ,indicating that the peroxidase may be regarded as the good index of the heavy rare earth toxicity.