谷蠹和米象对磷化氢抗性遗传的研究

本文就谷蠹Rhyzopertha dominica 和米象Sitophilus oryzae对磷化氢的抗性遗传进行了研究，分别对两个种的实验室敏感品系和粮仓现场采集的抗性品系作为亲本进行杂交。同时测定了各自的亲本及其F₁杂种、F₁对抗性亲本回交和F2混交后代的剂量-死亡率反应曲线，并对它们的结果进行了遗传分析。结果指出，谷蠹和米象的F₁杂种对磷化氢的抗性遗传都为不完全隐性，各自的显性度(D)分别是-0.768和-0.348。同时F₁，回交和F₂混交的观察值和计算值之间的X²分析也表明，抗性表现为一个以上的常染色体因子遗传，但是主要是受隐性因子所控制。

GENETIC ANALYSIS OF PHOSPHINE RESISTANCE INRHYZOPERTHA DOMINICA ANDSITOPHILUS ORYZAE

enetic studies were carried out on susceptible laboratory strains and field resistant strains of Rhyzopertha dominica and Sitophilus oryzae. Dose-mortality characteristics of susceptible and resistants parents and their F1 hybrids, F2-backcross progeny and F2 mass cross progeny were assessed in order to determine inheritance character. Results indicated that the reaction of F1 hybrid to phosphine was closer toits susceptible parent strain; x2 analysis of the responses observed of F1-backcross andF2 progeny rejected the null hypothesis of monogenic inheritance for resistance. Theinheritance of phosphine resistance in the two species was more complex and the resistance appears to be controlled by one or more autosomal factors but the majorgene involved are incompletely recessive. Degrees of dominace (D) are-0.768 for R.dominica and-0.348 for S. aryzae.