褐飞虱翊型分化遗传规律的研究

以褐飞虱Nilaparvata lugens (Stal)长翅型(macroptery，简称M)、短翅型(brachyptery，简称B)的遗传纯系为实验材料，进行亲本、稻株生育期、虫口密度三因子交互实验。结果表明：(1)在环境条件(指稻株生育期、虫口密度等)一致时，B♀×B♂、B♀×M♂、M♀×B♂、M♀×M♂四种亲本组合的F1代短翅型成虫百分率分别为：98%、92%、64%、29%，各亲本组合间差异极显著；(2)亲本相同时，将F1代褐飞虱初孵若虫多头词养(多于l0头/株)在黄熟期稻株上，其长翅型雌、雄成虫百分数均高于灌浆期稻株上；(3)单头饲养实验中发现，不论亲本组合、稻株生育期如何，雌虫绝大多数分化为短翅型，而雄虫则几乎全为长翅型。这表明褐飞虱的翅型分化遗传由一个受多种因子影响的调控体系决定，且调控作用与性别有关。

GENETIC STUDIES ON WING DIMORPHISM OF BROWN PLANTHOPPER, NILAPARVATA LUGENS (HOMOPTERA: DELPHACIDAE)

Experiments were carried out with the pure-bred strains of both macropterous (M) and brachypterous (B) brwn planthopper, Nilaparvata lugens (Stal) in order to know the effects of parents, rice growth stage and population density on the wing dimorphism. Under the same laboratory rearing condtion, the Fl progenies of B ♀×♂.B♀×M♂、M♀×B♂ and M♀×M♂provided 98%o. 92% 64% and 29% brachyptery adults respectively, and the ariance between each other was significant. At the density of more than 10 nymphs per plant, the percentages of both female and male macroptery adults whose nymphs were reared on yellow maturity rice were higher than those onmilk-filling stage rice. In single rear experiment, most of the female individuals turned out to be brachyptery, while males were dominated by macroptery, regardless of their parents and rice growth stage. Conclusion can be made from our studies that the wing dimorphism is controlled by a sex related gene expression regulation system affected bymany factors.