棉花感染黄萎病后叶片组分内生化特性分析

Analyses of Biochemical Characteristics in Cotton Leaves Infected by Verticillium dahliae Kled

在田间病圃发病高峰期,对抗黄萎病性不同的陆地棉品种及同一品种的感病和健康植株叶片组分内四项生化指标进行了研究.结果表明,抗病品种超氧物歧化酶(SOD)和过氧化物酶(POD)活性弱,膜脂过氧化水平低,可溶性蛋白质含量高.而感病品种表现相反.在同一品种(系)内,感病植株与健康植株相比,POD活性和膜脂过氧化水平高.从平均效应看,SOD活性健康植株高于感病株,可溶性蛋白质含量感病植株高于健康植株.试验结果还表明,无论是抗病品种或是感病品种,植株发病后POD活性皆上升幅度很大,对SOD活性的反应,抗病品种变化幅度小,感病品种变化幅度大.

At the most serious disease period under the field condition, four biochemical traits in leaves of cotton with different resistance to Verticillium dahliae and the traits between infected and intact plants in the same cultivars were studied. The results indicated that the disease-resistant cultivars displayed weak SOD and POD activities, low membrane lipid peroxidation and high soluble protein content. The sensitive cultivars showed the contrary results. In the same disease-senstitive cultivars,as compared with the intact plants,the infected plants showed higher POD activities and membrane lipid peroxidation. On the average, SOD activity was higher and soluble protein content was lower in intact plants. The results were also indicated that the rised extent of POD activities were large whatever in resistent or susceptible cultivars. The change extent of SOD activities in resistant cuitivars was gently,but in susceptible cultivars largely.