Inheritance Patterns, Dominance and Cross-Resistance of Cry1Ab-and Cry1Ac-Selected Ostrinia furnacalis (Guenee)
文献类型: 外文期刊
第一作者: He, Mingxia
作者: He, Mingxia;Wang, Zhenying;He, Kanglai;Gatehouse, Angharad M. R.;Edwards, Martin G.;Li, Qing
作者机构:
关键词: Ostrinia furnacalis;Cry1 toxins;cross-resistance;resistance inheritance
期刊名称:TOXINS ( 影响因子:4.546; 五年影响因子:4.8 )
ISSN: 2072-6651
年卷期: 2014 年 6 卷 9 期
页码:
收录情况: SCI
摘要: 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.
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