Abstract: Resistance and mechanism of four selected rice varieties to the rice stem borers (Chilo suppressalis Walker and Scirpophaga incertulas Walker) were analyzed in Shanghai rice cropping area. There were obvious differences of varietal resistance between Xiushui 04, the mainly-used variety in Shanghai area from the 1980s to 1990s, and the other three varieties, Hanyouxiangqing, Huayu 1 and 98110, which are released and popularized since the late stage of 1990s. The resistance of Xiushui 04 to the stem borers was significantly higher than those of the other three. At the elongation stage, the vascular bundle interval of Xiushui 04 was the smallest among the four varieties. Content of SiO 2 of Xiushui 04 was also the highest among the four. However, the other characteristics of the varieties, such as the proportions of other sixteen essential amino acids, amounts of N, P, K , as well as the structures of the rice stem tissue had no obvious or identical differences among the rice varieties.

Key words: rice, insect resistance, rice stem borer, yellow rice borer, vascular bundle interval, silicon content

摘要： 研究了上海地区20世纪80年代~90年代初的代表性栽培品种秀水04和3个当前推广品种（寒优香晴、98110、花育1号）对螟虫(主要指二化螟Chilo suppressalis、三化螟Scirpophaga incertulas)抗性的差异及其机理。结果表明：三化螟和二化螟对4个品种的为害率存在着显著差异，秀水04 的抗螟性明显高于其他3个近期品种。植株的组织学特征中，维管束间距大小与品种的螟虫侵入率表现出明显的负相关，秀水04的维管束间距显著小于其他3个品种；在无机化合物分析中硅的含量也以秀水04最高。

关键词: 水稻, 抗虫性, 二化螟, 三化螟, 维管束间距, 硅元素含量