棉铃虫滞育的遗传方式

ON THE DIAPAUSE GENETICS OF COTTON BOLL WORM

采自北京和湖北省武穴市的棉铃虫(Helicoverpa armigera H(?)bner)在24℃、12:12(L:D)光周期下的滞育率分别为80.32％和53.00％。对北京种群的滞育性和武穴种群的滞育不敏感性分别进行5代和14代选育,北京种群(B)的滞育反应无明显变化,而武穴种群(W)则稳定在20％～30％之间,表明武穴种群存在较大的遗传异质性。对二者的杂交试验显示,显性系数D_(WB)和D_(BW)分别为-0.2059和-0.4467,无明显的伴性遗传现象。对回交一代即B_1代滞育性状的x^2检验表明,棉铃虫滞育的遗传由2个以上不完全隐性的基因控制。

Under 24℃ and 12 : 12 (L : D) photoperiod conditions, the diapause rates of cotton bollworm (Helicoverpa armigera (Hubner)) populations collected from Beijing (population B) and Wuxue (population W) of Hubei Province were determined as 80. 32 % and 53. 00% , respectively . The diapause sensitivity of B and diapause insensi-tivity of W were selected for 5 and 14 generations in the laboratory, respectively, the results showed that there were no significant changes in the diapause rates of B, while that of W was obviously decreased and stabilized at 20% -30%. The results of reciprocal crossing tests showed that the mean dominance degrees of DWB and DBW were -0. 2059 and -0. 4467, respectively, indicated that there was no evident sex-linked inheritance between the two populations. The results of Chi square analysis on the B1's diapause characters of backcrosses were not conformed to single-gene-control regulation, suggesting that the diapause inheritance of cotton bollworm was controlled by more than two incomplete recessive genes.