Inheritance and Fitness Costs of Vip3Aa19 Resistance in Mythimna separata

文献类型： 外文期刊

第一作者： Wang, Yueqin

作者： Wang, Yueqin;Zhang, Tiantao;Bai, Shuxiong;Wang, Zhenying;He, Kanglai;Yang, Jing

作者机构：

关键词： bacillus thuringiensis; mythimna separata; inheritance; fitness costs; resistance management

期刊名称：TOXINS （ 影响因子：5.075； 五年影响因子：5.305 ）

ISSN：

年卷期： 2022 年 14 卷 6 期

页码：

收录情况： SCI

摘要： The "high-dose/refuge" strategy is expected to work most effectively when resistance is inherited as a functionally recessive trait and the fitness costs associated with resistance are present. In the present study, a laboratory selected Mythimna separata strain that have evolved >634.5-fold resistance to Vip3Aa19 was used to determine the mode of inheritance. To determine if fitness costs were associated with the resistance, life history parameters (larva stage, pupa stage, pupal weight, adult longevity and fecundity) of resistant (RR), -susceptible (SS) and heterozygous (R male S female and R female S male) strains on nontoxic diet were assayed. The LC50 values of R female S male were significantly higher than that of R male S female (254.58 mu g/g vs. 14.75 mu g/g), suggesting that maternal effects or sex linkage were present. The effective dominance h of F-1 offspring decreased as concentration increased, suggesting the resistance was functionally dominant at low concentration and recessive at high concentration. The analysis of observed and expected mortality of the progeny from a backcross suggested that more than one locus is involved in conferring Vip3Aa19 resistance. The results showed that significant differences in many life history traits were observed among the four insect genotypes. In short, resistance to Vip3Aa19 in M. separata was inherited as maternal and multigene and the resistance in the strain was associated with significant fitness costs. The results described here provide useful information for understanding resistance evolution and for developing resistance management strategies.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序