镉对堇叶碎米荠生长生理特性的影响

Effects of cadmium on growth and physiological characteristics of Cardamine violifolia

以堇叶碎米荠(Cardamine violifolia O.E.Schulz)作为研究材料,以氯化镉(CdCl2)的不同浓度(0、50、100、150、200 mg/L)处理50 d苗龄的堇叶碎米荠,测定其株高、鲜重、过氧化氢酶(CAT)活性、过氧化物酶(POD)活性和超氧化物歧化酶(SOD)活性。结果表明,当镉盐浓度高于50 mg/L时,镉对堇叶碎米荠的株高和鲜重都有显著的抑制效应;随着镉盐浓度的升高,堇叶碎米荠的叶绿素a、叶绿素b、叶绿素和叶绿素a/b下降;随着镉盐浓度的升高,堇叶碎米荠叶片和根系体内的保护酶活性先升高后降低,当镉盐浓度为150 mg/L时,各保护酶的活性达到最大。结果表明,堇叶碎米荠为资源植物,可作为土壤和水体镉污染的指示植物。

Cardamine violifolia was used as the research material,and the seedling age of 50 days was treated with cadmium chloride(CdCl2)at different concentrations(0、50、100、150、200 mg/L).The POD activity,SOD activity,plant height,fresh weight and CAT activity were measured.The results showed that when cadmium concentration was higher than 50 mg/L,cadmium had a significant inhibitory effect on the plant height and fresh weight of Cardamine violifolia.With the increase of cadmium concentration,the chlorophyll a,chlorophyll b,chlorophyll and chlorophyll a/b of Cardamine violifolia decreased.With the increase of cadmium concentration,the activities of protective enzymes in leaves and roots of Cardamine violifolia first increased and then decreased.When the concentration of cadmium salt was 150 mg/L,the activities of protective enzymes reached the maximum.The results showed that Cardamine violifolia was a resource plant and could be used as an indicator plant for cadmium pollution in soil and water.