Cry2Ab Tolerance Response of &lt;I&gt;Helicoverpa armigera&lt;/I&gt; (Lepidoptera: Noctuidae) Populations From Cry1Ac Cotton Planting Region

Gao, Yulin; Wu, Kongming; Shen, Zhicheng

doi:10.1603/029.102.0347

Cited by 26 publications

(28 citation statements)

References 34 publications

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“…One option is to switch to Bt cotton producing both Cry2Ab and Cry1Ac, which is already approved for small-scale trials in China. The results of Zhang et al (2011) from 2010 indicate that resistance to Cry1Ac did not confer cross-resistance to Cry2Ab, despite developmental rate data reported by Gao et al, (2009) showing a genetic correlation in susceptibility between Cry1Ac and Cry2Ab both within and across populations sampled in 2008 from Anci and Xiajin. Results from Arizona and India suggest that resistance to Cry1Ac confers little or no cross-resistance to Cry2Ab in pink bollworm (Dhurua and Gujar, 2011;Tabashnik et al, 2002Tabashnik et al, , 2009b.…”

Section: Discussionmentioning

confidence: 78%

Early detection of field-evolved resistance to Bt cotton in China: Cotton bollworm and pink bollworm

Tabashnik¹,

Wu²,

Wu³

2012

Journal of Invertebrate Pathology

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Section: Discussionmentioning

confidence: 78%

Early detection of field-evolved resistance to Bt cotton in China: Cotton bollworm and pink bollworm

Tabashnik¹,

Wu²,

Wu³

2012

Journal of Invertebrate Pathology

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“…correlations between resistance to Cry1Ac and Cry2Ab found in field-derived strains of H. zea and H. armigera (5,26).…”

Section: Discussionmentioning

confidence: 98%

“…Cry1Ac and Cry2Ab have been considered a good combination for pyramided Bt crops because they have low amino acid homology and bind to different target sites in the larval midgut (22,23). However, in field-derived strains of H. zea and Helicoverpa armigera, responses to Cry1Ac and Cry2Ab were genetically correlated, indicating potential crossresistance (5,(24)(25)(26)(27). Although redundant killing is critical for the success of the pyramid strategy, little is known about factors affecting redundant killing in H. zea and other pests with low susceptibility to Bt toxins.…”

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confidence: 99%

Potential shortfall of pyramided transgenic cotton for insect resistance management

Brévault

Heuberger

Zhang

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

155

222

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To delay evolution of pest resistance to transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt), the "pyramid" strategy uses plants that produce two or more toxins that kill the same pest. In the United States, this strategy has been adopted widely, with two-toxin Bt cotton replacing one-toxin Bt cotton. Although two-toxin plants are likely to be more durable than one-toxin plants, the extent of this advantage depends on several conditions. One key assumption favoring success of two-toxin plants is that they kill insects selected for resistance to one toxin, which is called "redundant killing." Here we tested this assumption for a major pest, Helicoverpa zea, on transgenic cotton producing Bt toxins Cry1Ac and Cry2Ab. Selection with Cry1Ac increased survival on two-toxin cotton, which contradicts the assumption. The concentration of Cry1Ac and Cry2Ab declined during the growing season, which would tend to exacerbate this problem. Furthermore, analysis of results from 21 selection experiments with eight species of lepidopteran pests indicates that some cross-resistance typically occurs between Cry1A and Cry2A toxins. Incorporation of empirical data into simulation models shows that the observed deviations from ideal conditions could greatly reduce the benefits of the pyramid strategy for pests like H. zea, which have inherently low susceptibility to Bt toxins and have been exposed extensively to one of the toxins in the pyramid before two-toxin plants are adopted. For such pests, the pyramid strategy could be improved by incorporating empirical data on deviations from ideal assumptions about redundant killing and cross-resistance. (Résumé d'auteur

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“…However, Gould et al (1992) reported crossresistance between Cry1Ac and Cry2Ab in a laboratory strain of Heliothis virescens (F.). In addition, responses to Cry1Ac and Cry2Ab were genetically correlated in Þeld population of H. virescens (Burd et al 2003), Helicoverpa zea (Boddie) (Jackson et al 2006), and H. armigera (Gao et al 2009b).…”

mentioning

confidence: 98%

“…Cross-resistance between Cry1Ac and Vip3A in Þeld populations of H. armigera has not being investigated in detail, even though the cross-resistance between Cry1Ac and Cry2Ab suggests the potential for cross-resistance between distinct Bt toxins (Gao et al 2009b). In the current study, we investigated the interaction between Cry1Ac and Vip3A in H. armigera Þeld populations by using bioassays of isofemale lines.…”

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confidence: 99%

Vip3Aa Tolerance Response of Helicoverpa armigera Populations From a Cry1Ac Cotton Planting Region

An¹,

Gao²,

Wu³

et al. 2010

jnl. econ. entom.

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Transgenic cotton, Gossypium hirsutum L., that expresses the Bacillus thuringiensis (Bt) Cry1Ac toxin, holds great promise in controlling target insect pests. Evolution of resistance by target pests is the primary threat to the continued efficacy of Bt cotton. To thwart pest resistance evolution, a transgenic cotton culitvar that produces two different Bt toxins, cry1Ac and vip3A genes, was proposed as a successor of cry1Ac cotton. This article reports on levels of Vip3Aa tolerance in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) populations from the Cry1Ac cotton planting region in China based on bioassays of the F1 generation of isofemale lines. In total, 80 isofemale families of H. armigera from Xiajin county of Shandong Province (an intensive Bt cotton planting area) and 93 families from Anci county of Hebei Province (a multiple-crop system including corn [Zea mays L.] , soybean [Glycine max (L.) Merr.], peanut (Arachis hypogaea L.), and Bt cotton) were screened with a discriminating concentration of both Cry1Ac- and Vip3A-containing diets in 2009. From data on the relative average development rates and percentage of larval weight inhibition of F1 full-sib families tested simultaneously on Cry1Ac and Vip3Aa, results indicate that responses to Cry1Ac and Vip3Aa were not genetically correlated in field population ofH. armigera. This indicates that the threat of cross-resistance between Cry1Ac and Vip3A is low in field populations of H. armigera. Thus, the introduction of Vip3Aa/Cry1Ac-producing lines could delay resistance evolution in H. armigera in Bt cotton planting area of China.

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Cry2Ab Tolerance Response of <I>Helicoverpa armigera</I> (Lepidoptera: Noctuidae) Populations From Cry1Ac Cotton Planting Region

Cited by 26 publications

References 34 publications

Early detection of field-evolved resistance to Bt cotton in China: Cotton bollworm and pink bollworm

Early detection of field-evolved resistance to Bt cotton in China: Cotton bollworm and pink bollworm

Potential shortfall of pyramided transgenic cotton for insect resistance management

Vip3Aa Tolerance Response of Helicoverpa armigera Populations From a Cry1Ac Cotton Planting Region

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