Biological performance of BollgardⅡ Bt-resistant vs susceptible population of pink bollworm,Pectinophora gossypiella(Saunders)on non-toxic diet  

作　　者：JAMBAGI Suresh R MOHAN M MURALIMOHAN K KAMBREKAR D.N VENKATESAN T 

机构地区：[1]ICAR-National Bureau of Agricultural Insect Resources,Bengaluru,Karnataka 560024,India [2]Department of Entomology,University of Agricultural Sciences,Bangalore,Karnataka 560065,India [3]Department of Agricultural Entomology,University of Agricultural Sciences,Dharwad,Karnataka 580005,India.

出　　处：《Journal of Cotton Research》2024年第4期339-352,共14页棉花研究（英文）

基　　金：the award of the DST-INSPIRE fellowship(IF190948)by the Department of Science and Technology,Government of India。

摘　　要：Background The pink bollworm,Pectinophora gossypiella(Saunders),is a devastating global pest of cotton that has caused substantial economic damage to Bt Bollgard-Ⅱ~?cotton plants in recent years due to the evolution of Bt resistance.The associated fitness cost is assumed to be one of the factors delaying the development of resistance against Bt transgenic crops.Hence,the present study was undertaken to assess the biological performance of pink bollworms by comparing the life history and demographic parameters of a resistant(Field-R)and susceptible(Lab-S)population.Results Prolonged larval duration(23.40 days in Field-R vs 18.80 days in Lab-S population),total life cycle(male=50.00 vs 42.80 days;female=53.60 vs 46.20 days),reduced fecundity(100.60 vs 154.20 eggs/female)and fertility(88.00 vs 138.00 fertile eggs/female)was observed.The demographic parameters indicated a significant reduction in the net reproductive rate(184.27 vs 276.72),innate capacity for increase in number(0.11 vs 0.15),finite rate of increase in number(1.12 vs 1.16 female progenies produced/female/day),weekly multiplication rate(2.16 vs 2.86),potential fecundity(545.06 vs 634.11 eggs),number of hypothetical F_2 females(33955.65 vs 76572.41),but longer mean length of generation(47.54 vs 37.74 days)and population doubling time(6.30 vs 4.62 days)in Field-R compared with Lab-S population.A stage-specific life to ble demonstrated the differences in survival rates between susceptible and resistant populations at various life stages,with the resistant population having higher generation mortality(0.22vs 0.19).Conclusions The study confirms the involvement of fitness costs associated with Bt resistance in P.gossypiella.Despite reduced reproductive fitness,the resistant population tried prolonging the larval stage as a compensatory mechanism to repair the damaged host tissues due to Bt intoxication and for accumulation of enough nutrient reserves for normal pupation and adult emergence.Presence of a high proportion of double Bt-resistant larvae in the

关 键 词：Bacillus thuringiensis Biological parameters Compensation Fitness cost Pectinophora gossypiella 

分 类 号：S435.622.3[农业科学—农业昆虫与害虫防治]