【摘要】 研究了不同水稻品种对三化螟Scirpophagaincertulas抗性差异的机理。结果表明 ,在汕优 6 3、镇稻 2号和 92 - 10 9稻株中 ,虫体的游离必需氨基酸含量极低 (0 42 2～ 0 875nmol mg) ,幼虫生长发育缓慢 ;而在 9- 92、武育粳 3号等稻株中 ,虫体的游离必需氨基酸含量高 (2 788～ 5 42 1nmol mg) ,幼虫生长快。虫体的游离必需氨基酸含量和生长发育的差异 ,与不同水稻品种的游离必需氨基酸含量、总必需氨基酸含量、还原糖含量和叶鞘硅化细胞密度均无明显相关。叶鞘维管束间距、鞘脊宽度及小于蚁螟头宽的叶鞘维管束间距百分率的差异 ,是不同水稻品种抗螟性差异的主要作用因子更多还原

【Abstract】 The mechanism of rice varietal resistance to the yellow stem borer (YSB),Scirpophaga incertulas,% was investigated and analyzed. There were significant differences among development rates and weight gain when YSB neonates fed on rice varieties with different resistant levels. The varieties Shan-you 63 (hybrid indica), Zhendao No. 2 and 92-109 (japonica) evidently inhibited the growth of YSB in comparison with other varieties tested. It was found that YSB larval performance was obviously correlated with the interval vascular bundles and the width of sheath ridge in the outer leaf sheath on primary stem of the rice tested rather than the contents of essential amino acids and reductive carbohydrate in these rice plants.更多还原