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Toxins 2017, 9(6), 186; doi:10.3390/toxins9060186

Characterization of Asian Corn Borer Resistance to Bt Toxin Cry1Ie

1
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
2
Department of Entomology, China Agricultural University, Beijing 100193, China
*
Author to whom correspondence should be addressed.
Academic Editors: Juan Ferré and Baltasar Escriche
Received: 24 February 2017 / Revised: 21 May 2017 / Accepted: 1 June 2017 / Published: 7 June 2017
(This article belongs to the Special Issue The Insecticidal Bacterial Toxins in Modern Agriculture)
View Full-Text   |   Download PDF [289 KB, uploaded 7 June 2017]   |  

Abstract

A strain of the Asian corn borer (ACB), Ostrinia furnacalis (Guenée), has evolved >800-fold resistance to Cry1Ie (ACB-IeR) after 49 generations of selection. The inheritance pattern of resistance to Cry1Ie in ACB-IeR strain and its cross-resistance to other Bt toxins were determined through bioassay by exposing neonates from genetic-crosses to toxins incorporated into the diet. The response of progenies from reciprocal F1 crosses were similar (LC50s: 76.07 vs. 74.32 μg/g), which suggested the resistance was autosomal. The effective dominance (h) decreased as concentration of Cry1Ie increased. h was nearly recessive or incompletely recessive on Cry1Ie maize leaf tissue (h = 0.02), but nearly dominant or incompletely dominant (h = 0.98) on Cry1Ie maize silk. Bioassay of the backcross suggested that the resistance was controlled by more than one locus. In addition, the resistant strain did not perform cross-resistance to Cry1Ab (0.8-fold), Cry1Ac (0.8-fold), Cry1F (0.9-fold), and Cry1Ah (1.0-fold). The present study not only offers the manifestation for resistance management, but also recommends that Cry1Ie will be an appropriate candidate for expression with Cry1Ab, Cry1Ac, Cry1F, or Cry1Ah for the development of Bt maize. View Full-Text
Keywords: Ostrinia furnacalis; Bacillus thuringiensis; inheritance; cross-resistance; resistance management Ostrinia furnacalis; Bacillus thuringiensis; inheritance; cross-resistance; resistance management
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, Y.; Yang, J.; Quan, Y.; Wang, Z.; Cai, W.; He, K. Characterization of Asian Corn Borer Resistance to Bt Toxin Cry1Ie. Toxins 2017, 9, 186.

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