Modified female calling behaviour in Cry1Ac‐resistant <i>Helicoverpa armigera</i> (Lepidoptera: Noctuidae)

Zhao, Xin; Wu, Kai; liang, Ge M; Guo, Yu

doi:10.1002/ps.1697

Cited by 15 publications

(20 citation statements)

References 28 publications

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“…The study of fitness costs associated with insect resistance to Bt insecticidal proteins is important for understanding resistance evolution and evaluating resistance management practices used to mitigate resistance to transgenic crops . Some studies on Bt ‐based fitness cost in H. armigera have been carried out before . However, this is the first report on the reproductive physiology associated with Cry1Ac resistance in H. armigera .…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that individuals with more vitellogenic follicles have larger egg production . We propose that factors affecting early life fitness have deleterious effects on fitness in later stages of development, as Bt ‐resistant individuals exhibit a delayed larval development, delayed calling behaviour and reduced mating behaviour . The significant decline in the number of eggs laid female −1 and the hatching rate in CK2 can be attributed to the low proportion of female calling behaviour during the first 3 days …”

Section: Discussionmentioning

confidence: 99%

“…For instance, in H. armigera , seventh‐day larval weight, pupal weight and percentage of eggs hatched were reduced and larval duration stage was delayed in the Bt ‐resistant colony by comparison with the Bt ‐susceptible strain . Other studies reported that the proportion of calling and mating in females of the resistant strain was significantly lower compared with those of the susceptible strain, and the age of the calling peak was delayed by one night . Susceptibility reversion to Bt toxin in resistant H. armigera was associated with an increase in larval survival and development rate .…”

Section: Introductionmentioning

confidence: 99%

“…25 Other studies reported that the proportion of calling and mating in females of the resistant strain was significantly lower compared with those of the susceptible strain, and the age of the calling peak was delayed by one night. 26,27 Susceptibility reversion to Bt toxin in resistant H. armigera was associated with an increase in larval survival and development rate. 28 Liang et al reported that there were fitness costs in Cry1Ac-resistant H. armigera on diapause-inducing conditions, cold hardiness and flight ability.…”

Section: Introductionmentioning

confidence: 99%

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Fitness costs of reproductive capacity and ovarian development in a Bt‐resistant strain of the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

Zhang

Zhong

et al. 2014

Pest Management Science

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BACKGROUND The cotton bollworm Helicoverpa armigera has developed resistance to the insecticidal Cry1Ac toxins produced by Bacillus thuringiensis (Bt) in China. To gain a better understanding of the fitness cost associated with resistance evolution, reproductive capacities and ovarian development were examined in four strains of H. armigera: a Cry1Ac‐susceptible strain (96S); a Cry1Ac‐resistant strain fed on an artificial diet with Cry1Ac toxin for 135 generations (BtR); two strains derived from BtR: a strain grown without Cry1Ac selection for 38 generations (CK1) and a strain grown for one generation without Cry1Ac selection (CK2). RESULTS Strains 96S and CK1 had similar reproductive capacity and Cry1Ac susceptibility. Compared with the 96S and CK1 strains, the fecundity and hatching rate of CK2 were respectively more than 30% and 50% lower. Moreover, the number of eggs laid by BtR was significantly lower than the number of eggs laid by 96S and CK1, but higher than the number of eggs laid by CK2. In accordance with the differences in reproductive capacity, ovarian development in CK2 and BtR was significantly delayed. CONCLUSION These results indicated that there was a fitness cost in the reproductive physiology in the resistant strains. Reversion to susceptibility to the Bt Cry‐toxin in the resistant CK1 strain was associated with an increase in reproductive capacity. © 2014 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fitness costs of reproductive capacity and ovarian development in a Bt‐resistant strain of the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

Zhang

Zhong

et al. 2014

Pest Management Science

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“…In addition, Cry1Ac-resistant strains of H. armigera showed significantly higher diapause rates than susceptible strains [22]. More recently, Zhao et al [23] observed altered calling behavior in the Cry1Ac-resistant strain of H. armigera. Compared with the susceptible strain, the resistant strain showed a reduced proportion of calling individuals, decreased rates of calling, different calling times, and a delayed calling peak.…”

Section: Resistance Selection and Fitness Costsmentioning

confidence: 94%

Cotton bollworm resistance to Bt transgenic cotton: A case analysis

Liu

Gao

et al. 2010

Sci. China Life Sci.

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Cotton bollworm (Helicoverpa armigera) is one of the most serious insect pests of cotton. Transgenic cotton expressing Cry toxins derived from a soil bacterium, Bacillus thuringiensis (Bt), has been produced to target this pest. Bt cotton has been widely planted around the world, and this has resulted in efficient control of bollworm populations with reduced use of synthetic insecticides. However, evolution of resistance by this pest threatens the continued success of Bt cotton. To date, no field populations of bollworm have evolved significant levels of resistance; however, several laboratory-selected Cry-resistant strains of H. armigera have been obtained, which suggests that bollworm has the capacity to evolve resistance to Bt. The development of resistance to Bt is of great concern, and there is a vast body of research in this area aimed at ensuring the continued success of Bt cotton. Here, we review studies on the evolution of Bt resistance in H. armigera, focusing on the biochemical and molecular basis of Bt resistance. We also discuss resistance management strategies, and monitoring programs implemented in China, Australia, and India.

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Suppressing calcineurin activity increases the toxicity of Cry2Ab to Helicoverpa armigera

Wei

Yang

Zhou

et al. 2021

Pest Management Science

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BACKGROUND Extensive planting of transgenetic Bacillus thuringiensis crops has driven the evolution of pest resistance to Cry1Ac. Adjustment of cropping structures has promoted further outbreak of Helicoverpa armigera in China. To control this pest, a combination of pyramiding RNA interference (RNAi) and Cry2Ab is considered a promising strategy for countering cross‐resistance and enhancing the toxicity of Cry2Ab to cotton bollworm. We explored the possibility of using calcineurin (CAN) as a target RNAi gene, because it is involved in cotton bollworm responses to the toxicity of Cry2Ab. RESULTS Cry2Ab treatment led to a significant increase in HaCAN mRNA level and HaCAN activity. Suppression of HaCAN activity due to RNAi‐mediated knockdown of HaCAN increased the susceptibility of midgut cells to Cry2Ab. The increase in HaCAN activity shown by heterologous expression of HaCAN reduced the cytotoxicity of Cry2Ab to Sf9 cells. Moreover, ingestion of HaCAN‐specific inhibitor FK506 increased the toxicity of Cry2Ab in larvae. Interestingly, HaCAN does not function as a Cry2Ab direct binding protein that participates in Cry2Ab toxicity. CONCLUSIONS The results in this study provide evidence that suppression of HaCAN not only affected the development of the cotton bollworm, but also enhanced the toxicity of Cry2Ab to the pest. HaCAN is therefore an important candidate gene in cotton bollworm that can be targeted for pest control when the pest infests RNAi+Cry2Ab crops. Meanwhile, the mechanism of action of HaCAN in Cry2Ab toxicity suggested that protein dephosphorylation was involved. © 2020 Society of Chemical Industry

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Modified female calling behaviour in Cry1Ac‐resistant Helicoverpa armigera (Lepidoptera: Noctuidae)

Cited by 15 publications

References 28 publications

Fitness costs of reproductive capacity and ovarian development in a Bt‐resistant strain of the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

Fitness costs of reproductive capacity and ovarian development in a Bt‐resistant strain of the cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

Cotton bollworm resistance to Bt transgenic cotton: A case analysis

Suppressing calcineurin activity increases the toxicity of Cry2Ab to Helicoverpa armigera

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