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Inheritance Patterns, Dominance and Cross-Resistance of Cry1Ab-and Cry1Ac-Selected Ostrinia furnacalis (Guenée)

Lookup NU author(s): Professor Angharad MR Gatehouse, Dr Martin Edwards, Professor Kanglai He

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Two colonies of Asian corn borer, Ostrinia furnacalis (Guenee), artificially selected from a Bt-susceptible colony (ACB-BtS) for resistance to Cry1Ab (ACB-AbR) and Cry1Ac (ACB-AcR) toxins, were used to analyze inheritance patterns of resistance to Cry1 toxins. ACB-AbR and ACB-AcR evolved significant levels of resistance, with resistance ratios (RR) of 39-fold and 78.8-fold to Cry1Ab and Cry1Ac, respectively. The susceptibility of ACB-AbR larvae to Cry1Ac and Cry1F toxins, which had not previously been exposed, were significantly reduced, being > 113-fold and 48-fold, respectively. Similarly, susceptibility of ACB-AcR larvae to Cry1Ab and Cry1F were also significantly reduced (RR > nine-fold, RR > 18-fold, respectively), indicating cross-resistance among Cry1Ab, Cry1Ac, and Cry1F toxins. However, ACB-AbR and ACB-AcR larvae were equally susceptible to Cry1Ie as were ACB-BtS larvae, indicating no cross-resistance between Cry1Ie and Cry1Ab or Cry1Ac toxins; this may provide considerable benefits in preventing or delaying the evolution of resistance in ACB to Cry1Ab and Cry1Ac toxins. Backcrossing studies indicated that resistance to Cry1Ab toxin was polygenic in ACB-AbR, but monogenic in ACB-AcR, whilst resistance to Cry1Ac toxin was primarily monogenic in both ACB-AbR and ACB-AcR, but polygenic as resistance increased.


Publication metadata

Author(s): Zhang TT, He MX, Gatehouse AMR, Wang ZY, Edwards MG, Li Q, He KL

Publication type: Article

Publication status: Published

Journal: Toxins

Year: 2014

Volume: 6

Issue: 9

Pages: 2694-2707

Online publication date: 11/09/2014

Acceptance date: 18/08/2014

ISSN (electronic): 2072-6651

Publisher: MDPI AG

URL: http://dx.doi.org/10.3390/toxins6092694

DOI: 10.3390/toxins6092694


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