棉花的抗氧化系统与其抗黄萎病的关系

Reactions of Anti-Oxidant System of Variable Resistant Cotten Varieties to Verticil Hum Wilt Stress

当棉株受到黄萎病胁迫而未表现症状时,感病品种的SOD、POD活性及脂质过氧化水平均高于耐病品种,可溶性蛋白含量较低,出现症状后,棉叶SOD、POD活性变化以耐病品种表现明显提高,感病品种提高较少或略有下降,耐病品种可溶性蛋白含量下降,感病品种可溶性蛋白含量提高.耐病品种和感病品种均表现脂质过氧化产物丙二醛含量和质膜电解质外渗率提高,以耐病品种提高较少,而感病品种提高较多.研究表明,棉株感染黄萎病后,叶片SOD、POD活性变化与品种抗病性显著相关.

When cotton infected by Verticillium wilt disease but without disease symptom, the disease-sensitive varieties displayed higher activities of SOD, POD, membrane lipid peroxidation and lower concent of soluble protein than disease-tolerant varieties. After appearing of disease symptom,the activities of SOD,POD of tolerant varieties increased significantly with respect to those of sensitive ones decreased of increased slightly. The content of soluble protein of sensitive varieties increased while decreased in tolerant ones. Dielectric leaking rate and MDA content of the two resistant type varieties increased after appearance of disease symptom, while the increase of sensitive varieties were far higher than those of tolerant ones. The research indicated that the changes of activities of SOD,POD were correlated with the disease resistance significantly.