›› 2002, Vol. 45 ›› Issue (1): 91-95.

• 研究论文 • 上一篇    下一篇

不同水稻品种对三化螟抗性差异的机理

方继朝1, 郭慧芳1, 程遐年2, 杜正文1   

  • 出版日期:2002-02-20 发布日期:2002-02-20

Mechanism of rice varietal resistance differences to the yellow stem borer, Scirpophaga incertulas

FANG Ji-Chao1, GUO Hui-Fang1, CHENG Xia-Nian2, DU Zheng-Wen1   

  • Online:2002-02-20 Published:2002-02-20

摘要: 研究了不同水稻品种对三化螟Scirpophaga incertulas抗性差异的机理。结果表明, 在汕优63、镇稻2号和92-109稻株中, 虫体的游离必需氨基酸含量极低(0.422~0.875 nmol/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(2.788~5.421 nmol/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。

关键词: 三化螟, 生长发育, 水稻抗虫性, 维管束间距, 必需氨基酸

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.

Key words: Scirpophaga incertulas, growth, rice resistance, interval between vascular bundles, free essential amino acid