Annepu, A A and Naik, V C B and Rao, G M V P and Kukanur, V S and Chiranjivi, Ch and Kumar, P A and Rao, V S (2023) Frequency of Cry1Ac and Cry2Ab resistance alleles in pink bollworm, Pectinophora gossypiella Saunders from Andhra Pradesh, India. Phytoparasitica, 51. pp. 491-502. ISSN 1876-7184
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Abstract
Since 2002, transgenic crops that produce Cry1Ac and Cry2Ab toxins have been used in India to control bollworms. From 2002 to 2009, Bt-cotton effectively controlled the pink bollworm (PBW). However, since 2009 numerous studies have reported high survival of PBW on Bt-cotton expressing Cry1Ac and Cry2Ab toxins, indicating reduced susceptibility to Cry toxins expressed in Bt-cotton. In the current study, we attempted to estimate the frequency of resistance alleles to Cry1Ac and Cry2Ab toxins in a field collected population of pink bollworms from Andhra Pradesh. Resistance allele frequency was estimated using an F2 screen methodology for the first time after 17 years of Bt-cotton cultivation. Our study finds that the allele frequency for Cry1Ac is 0.082 and for Cry2Ab is 0.054, with a detection probability of greater than 97%. In our survey conducted in 2018–19 and 2019–20, we also noticed high survival and damage by PBW on Bt-cotton expressing Cry1Ac and Cry2Ab. Our survey report reveals, > 30% flower damage, > 90% green boll damage and > 80% locule damage by PBW on Bt-cotton expressing Cry1Ac and Cry2Ab toxins.
| Item Type: | Article |
|---|---|
| Divisions: | Global Research Program - Resilient Farm and Food Systems |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Field-evolved resistance, Pink bollworm, F2 screen, Cry toxins, Bt resistance |
| Subjects: | Others > Entomology Others > India |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 24 Oct 2023 04:56 |
| Last Modified: | 24 Oct 2023 04:56 |
| URI: | http://oar.icrisat.org/id/eprint/12233 |
| Official URL: | https://link.springer.com/article/10.1007/s12600-0... |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | The authors are highly thankful to the Authorities of Acharya NG Ranga Agricultural University, Lam, Andhra Pradesh, India, and the Central Institute for Cotton Research (ICAR-CICR), Nagpur, India, for providing the necessary facilities to conduct the research. |
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