水稻品种对稻纵卷叶螟抗性的物理及生化机制

稻纵卷叶螟Cnaphalocrocis medinalis连年大发生，为在其治理中培育和推广抗虫品种，本文应用扫描电镜和生化测定研究了5个常用水稻栽培品种扬辐粳8号、扬稻6号、扬粳9538、淮稻9号和宁梗1号叶片中的硅含量、硅颗粒大小、蜡质含量等物理指标和一些生化指标与抗虫性的关系，并比较了稻纵卷叶螟幼虫危害不同水稻品种后其体内生化反应的差异。结果表明抗虫品种宁梗1号、淮稻9号叶片表面的硅含量显著高于感虫品种，硅颗粒大小在品种间无显著差异。宁粳1号叶片蜡质含量显著高于其他品种。由此表明叶片表面硅和蜡质含量与抗性有关。稻纵卷叶螟幼虫取食后，抗虫品种体内的过氧化物酶（POD）、超氧化物岐化酶（SOD）活性显著高于感虫品种，但丙二醛(MDA)含量低于感虫品种。稻纵卷叶螟幼虫取食不同品种后，其体内一些酶的活性明显不同，取食抗虫品种的幼虫体内POD和谷胱甘肽-S-转移酶(GST)活性显著高于取食其他品种的幼虫，SOD活性显著低于取食感虫品种的幼虫， 表明抗虫品种对稻纵卷叶螟幼虫有毒害作用。

Physical and biochemical mechanisms of resistance of different rice varieties to the rice leaffolder,Cnaphalocrocis medinalis (Lepidoptera:Pyralidae)

Cnaphalocrocis medinalis outbreak occurred in recent years in rice production region of China.To breed and extend resistance variety in pest management,the present paper investigated the relationship of silica content,silica grain diameter and wax content in rice leaf and biochemical index in five common rice cultivars,including Yangfujing 8,Yangdao 6,Yangjing 9538,Huaidao 9 and Ningjing 1,with resistance to rice leaffolder C.medinalis,and compared the differences in biochemical responses in larvae feeding ...