水稻品种对褐飞虱的田间抗性及其生态学机制

评价了7个水稻品种(浙粳22、宜香845、中组14、秀水123、二优倍九、感虫对照品种TN1和抗虫对照品种IR36)在田间成株期对褐飞虱Nilaparvata lugens(Stl)的抗性表现,并初步分析了它们的抗性机制。结果表明,在田间网室人工诱发条件下,浙粳22、宜香845、秀水123和中组14等4个品种的抗性水平与抗虫品种IR36相同,均小于3级,表现为抗虫,而二优培九则与感虫品种TN1相同,表现为感虫。在自然发生条件下的水稻分蘖期至乳熟期,宜香845和中组14上褐飞虱数量仅为TN1上的7.84%～24.44%,秀水123和浙粳22则为TN1上的30.19%～60.27%。在4个抗性品种上褐飞虱的产卵量和卵孵化率明显减少,而若虫存活率仅为TN1上的20%～30%。与IR36相同,4个抗性品种上褐飞虱的若虫存活率和种群增长倍数均显著低于TN1上,说明他们对褐飞虱的抗性主要表现为抗生性。

The ecological mechanisms of resistance of rice varieties to the brown planthopper,Nilaparvata lugens,in paddy fields

The resistance of 7 rice varieties,including Zhejing 22,Yixiang 845,Xiushui123,Zhongzu 14,Eryoupeijiu,susceptible rice variety TN1 and resistant rice variety IR36,to the rice brown planthopper（BPH）,Nilaparvata lugens（Stl）,were evaluated in adult plants in paddy fields and a preliminary exploration of the mechanisms of resistance conducted.The results show that susceptibility of the Zhejing 22,Yixiang 845,Xiushui123 and Zhongzu 14 strains were less than 3,the same level as that of the IR36 strain,implying high resistance in fields artificially infested with BPH.Susceptibility of the Eryoubeijiu strain was more than 7,the same as the highly susceptible TN1 strain.The abundance of BPH on the Zhongzu 14 and Yixiang 845 strains was 7.84%-24.44% that on the TN1 strain during the rice tillering and milky stages,whereas abundance on the Xiushui123 and Zhejing 22 strains was 30.19%-60.27% that on the TN1 strain.The fecundity and egg hatchability of BPH on the 4 resistant varieties was obviously reduced,and their nymph survival and population growth rates were significantly lower than that of BPH populations on TN1.This implies that the resistance mechanism of the 4 resistant varieties may be chemical in nature.