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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。
Cnaphalocrocis medinalis was found in successive years. In order to cultivate and promote insect-resistant cultivars in its management, five common rice cultivars, Yangfujing 8, Yangdao 6 and Yangzhou, were studied by scanning electron microscopy and biochemical methods. Japonica 9538, huaiyao 9 and ning stem 1 in the silicon content, silicon particle size, wax content and other physical indicators and some biochemical indicators and the relationship between insect resistance, and compare the damage of rice leaf roller larvae different Differences in vivo biochemical reactions after rice varieties. The results showed that the silicon content of the insect resistant varieties Ning stem 1 and Huai 9 was significantly higher than that of the susceptible insects, and the grain size of silicon had no significant difference among varieties. Ningjing 1 leaves wax content was significantly higher than other varieties. This shows that the leaf surface silicon and wax content and resistance. The activities of peroxidase (POD) and superoxide dismutase (SOD) in the insect-resistant varieties were significantly higher than those in the susceptible varieties, but the content of malondialdehyde (MDA) was lower than Insect species. After feeding on different varieties of C. medinalis larvae, the activity of some enzymes was significantly different. The activity of POD and glutathione-S-transferase (GST) in larvae fed on insect-resistant varieties was significantly higher than that fed on the other The larvae and SOD activity of the cultivars were significantly lower than those of the larvae fed on the susceptible insects species, indicating that the insect-resistant varieties had a toxic effect on the larvae of the rice leaf roller.