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Characterizing The Mode Of Resistance Inheritance And Cross Resistance In Pink Bollworm Against Cry1Ac Toxin And Organophosphate Pesticides In Pakistan

文献类型： 外文期刊

作者： Akhtar, ZR; Rasul, A; Sagheer, M; Ali, A; Ashraf, I; Saddiq, B; Mansoor-ul-Hasan

作者机构：

关键词： Pink Bollworm; Cross Resistance; Toxicity; Resistance Development

期刊名称： PAKISTAN JOURNAL OF AGRICULTURAL SCIENCES

ISSN： 0552-9034

年卷期： 2020 年 57 卷 4 期

页码：

收录情况： JCR（2021版）

摘要： In this study, resistance inheritance and cross resistance to Cry1Ac toxin and the insecticide triazophos in the pink bollworm (Pectinophora gossypiella) was investigated. F-1 progeny were simultaneously backcrossed with susceptible parents to obtainF(2) progeny withless genetic resistance against the Cry1Ac toxin and insecticide triazophos. In two sets of experiments, Cry1Ac/triazophos-resistant pink bollworms (Cry1Ac-R/Triazo-R)were selected through six generations and were reciprocally crossed with susceptible laboratory strains (Cry1Ac-S/Triazo-S). Resistance ratios for reciprocal crosses of Cry1Ac and triazophos were 16.25 and 27.11, respectively, while Resistant Parent RR values showing cross resistancewere10.51 and 6.50 folds, respectively. F-1 progeny were again back-crossed with susceptible parents to prove the phenomena of refuge strategy instantaneously reducing the resistance developeding pink bollworms. Parents, F-1 and F(2)progenies were tested for their LC50 values. Results of cross resistance forCry1Ac-showed, dominance value of resistance was below 1, proving that resistance was completely recessive but autosomal in nature and was controlled by more than one gene. For triazophos, dominance was also autosomal but was dependent on concentration, i.e., at low concentration it was incompletely dominant, at middle concentration, partially recessive; while at higher concentration it was completely recessive. These findings are helpful for pink bollworm control in Bt cotton expressing Cry1Ac combined with insecticides spray.

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