【摘要】 就小菜蛾Plutellaxylostella对阿维菌素的抗性遗传方式和抗性品系的相对适合度进行了研究。室内选育的阿维菌素抗性品系与同源的敏感品系杂交、F1代自交、F1代与亲本回交 ,结果表明 :杂交后的显性度 (D)分别为 - 0 6 4和 - 0 52 ,说明小菜蛾对阿维菌素的抗性是常染色体、不完全隐性遗传 ;χ2 检验证实 ,可能是多基因控制的抗性遗传。杂交F1代乙酰胆碱酯酶 (AChE)、羧酸酯酶(CarE)和谷胱甘肽转移酶 (GST)活性比抗性亲本有所降低 ,F2 代及回交后代三种酶的活性继续降低。种群适合度研究表明 ,抗性品系相对于敏感品系有 0 84的适合度。更多还原

【Abstract】 The genetics of resistance to avermectins (AVMs) and the relative fitness between resistant and susceptible strains to AVMs in diamondback moth (DBM), Plutella xylostella , were investigated during 1997～1999. The methods of cross and back cross between AVMs selected resistance strain and isogenic susceptible strain were used for exploring the inheritance mode of resistance to AVMs in DBM. The results showed that the degree of dominance of F RS and F SR were -0 64 and -0 52, respectively. It suggested that the resistance of DBM to AVMs was autosomal, incompletely recessive and probably polygenic confirmed by χ 2 test. The activities of acetylcholinesterase, carboxylesterase and glutathione S transferases of F 1 hybrids were lower than that of resistance parental strain, and continuously declined in F 2 and BC. The resistant strain possessed 0 84 of fitness value relative to the isogenic susceptible strain.更多还原