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Frequency of Cry1Ac and Cry2Ab resistance alleles in pink bollworm, Pectinophora gossypiella Saunders from Andhra Pradesh, India

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Relation http://oar.icrisat.org/12233/
https://link.springer.com/article/10.1007/s12600-023-01066-x
https://doi.org/10.1007/s12600-023-01066-x
 
Title Frequency of Cry1Ac and Cry2Ab resistance alleles in pink bollworm, Pectinophora gossypiella Saunders from Andhra Pradesh, India
 
Creator Annepu, A A
Naik, V C B
Rao, G M V P
Kukanur, V S
Chiranjivi, Ch
Kumar, P A
Rao, V S
 
Subject Entomology
India
 
Description 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.
 
Publisher Springer Nature
 
Date 2023-03-22
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_attribution
 
Identifier http://oar.icrisat.org/12233/1/Phytoparasitica_51_491-502_2023.pdf
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