Field‐evolved resistance to <i>Bt</i> toxin Cry1Ac in the pink bollworm, <i>Pectinophora gossypiella</i> (Saunders) (Lepidoptera: Gelechiidae), from India

Dhurua, S.; Gujar, G. T.

doi:10.1002/ps.2127

Cited by 295 publications

(199 citation statements)

References 29 publications

Supporting

Mentioning

190

Contrasting

Unclassified

Order By: Relevance

“…O desenvolvimento de resistência de insetos-praga a toxinas Cry foi relatado em relação à proteína Cry1Ab expressa em milho, na África do Sul (Van Rensburg, 2007), Cry1F expressa em milho, em Porto Rico (Storer et al, 2010), e Cry1Ac em algodão, na Índia (Dhurua & Gujar, 2011). Assim, a combinação de proteínas inseticidas é uma alternativa eficiente para o manejo de resistência, visto que combinações efetivas poderiam ser usadas no desenvolvimento de variedades de plantas transgênicas, pois as proteínas Vip3 não têm semelhança com as Cry e, portanto, reconhecem diferentes receptores no intestino médio (1) Coeficiente angular da reta ± erro-padrão.…”

Section: Resultsunclassified

Interação de proteínas Cry1 e Vip3A de Bacillus thuringiensis para controle de lepidópteros-praga

Crialesi-Legori

Davolos

Lemes

et al. 2014

Pesq. agropec. bras.

View full text Add to dashboard Cite

Resumo -O objetivo deste trabalho foi avaliar a suscetibilidade das lagartas Anticarsia gemmatalis (Lepidoptera: Erebidae) e Chrysodeixis includens (Lepidoptera: Noctuidae) às proteínas Cry1 e Vip3A, bem como determinar se há a interação entre essas proteínas no controle das duas espécies. Bioensaios com as proteínas isoladas e em combinações foram realizados, e as concentrações letais CL 50 e CL 90 foram estimadas para cada condição. As proteínas Cry1Aa, Cry1Ac e Vip3Af foram as mais efetivas no controle de A. gemmatalis, enquanto Cry1Ac, Vip3Aa e Vip3Af foram mais efetivas no de C. includens. As proteínas Cry1Ac e Cry1Ca causaram maior inibição do desenvolvimento das larvas sobreviventes à CL 50 , em ambas as espécies. Combinações entre Vip3A e Cry1 apresentam efeito sinérgico no controle das espécies e a combinação Vip3Aa+Cry1Ea destaca-se no controle de A. gemmatalis e C. includens. Essas proteínas combinadas são promissoras na construção de plantas piramidadas, para o controle simultâneo das pragas.Termos para indexação: Anticarsia gemmatalis, Chrysodeixis includens, manejo da resistência, piramidação de genes, sinergismo, soja transgênica. Interaction of Cry1 and Vip3A proteins of Bacillus thuringiensis for the control of lepidopteran insect pestsAbstract -The objective of this work was to evaluate the susceptibility of Anticarsia gemmatalis (Lepidoptera: Erebidae) and Chrysodeixis includens (Lepidoptera: Noctuidae) caterpillars to Cry1 and Vip3A proteins, as well as to determine if there is any interaction between these proteins on the control of the two species. Bioassays with both isolated and combined proteins were carried out, and lethal concentrations LC 50 and LC 90 were estimated for each condition. Cry1Aa, Cry1Ac, and Vip3Af were the more effective proteins for the control of A. gemmatalis, while Cry1Ac, Vip3Aa, and Vip3Af were more effective for the control of C. includens. Cry1Ac and Cry1Ca proteins caused the highest inhibition to the development of larvae that survived the LC 50 dose in both species. Different combinations of Vip3A and Cry1 have synergistic effect in the control of both species, and the combination Vip3Aa + Cry1Ea showed an outstanding control of A. gemmatalis and C. includens. These proteins are promising for building pyramided plants for the simultaneous control of the pests.

show abstract

Section: Resultsunclassified

Interação de proteínas Cry1 e Vip3A de Bacillus thuringiensis para controle de lepidópteros-praga

Crialesi-Legori

Davolos

Lemes

et al. 2014

Pesq. agropec. bras.

View full text Add to dashboard Cite

show abstract

“…Whereas compliance with refuge requirements is considered a key factor that delayed evolution of pink bollworm resistance to Bt cotton in the United States, the scarcity of non-Bt cotton refuges probably hastened this pest's resistance to Bt cotton in India (8,9). In the Yangtze River Valley, millions of farmers have planted F 2 hybrid cotton not as a resistance management strategy, but apparently for immediate benefits that may include higher yield relative to parental varieties, reduced expenses for insecticides relative to non-Bt cotton, and reduced cost of seeds relative to F 1 hybrids.…”

Section: Significancementioning

confidence: 99%

“…The benefits of these Bt crops include pest suppression, reduced insecticide use, enhanced biological control, and increased farmer profits (2-7). However, increasingly rapid evolution of resistance to Bt crops by pests has eroded these benefits (8)(9)(10)(11). The main strategy for delaying pest resistance to Bt crops aims to increase the survival of susceptible insects with "refuges" of host plants that do not produce Bt toxins (9).…”

mentioning

confidence: 99%

Hybridizing transgenic Bt cotton with non-Bt cotton counters resistance in pink bollworm

Wan

Cong

et al. 2017

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

123

View full text Add to dashboard Cite

Extensive cultivation of crops genetically engineered to produce insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) has suppressed some major pests, reduced insecticide sprays, enhanced pest control by natural enemies, and increased grower profits. However, these benefits are being eroded by evolution of resistance in pests. We report a strategy for combating resistance by crossing transgenic Bt plants with conventional non-Bt plants and then crossing the resulting first-generation (F 1 ) hybrid progeny and sowing the second-generation (F 2 ) seeds. This strategy yields a random mixture within fields of three-quarters of plants that produce Bt toxin and one-quarter that does not. We hypothesized that the non-Bt plants in this mixture promote survival of susceptible insects, thereby delaying evolution of resistance. To test this hypothesis, we compared predictions from computer modeling with data monitoring pink bollworm (Pectinophora gossypiella) resistance to Bt toxin Cry1Ac produced by transgenic cotton in an 11-y study at 17 field sites in six provinces of China. The frequency of resistant individuals in the field increased before this strategy was widely deployed and then declined after its widespread adoption boosted the percentage of non-Bt cotton plants in the region. The correspondence between the predicted and observed outcomes implies that this strategy countered evolution of resistance. Despite the increased percentage of non-Bt cotton, suppression of pink bollworm was sustained. Unlike other resistance management tactics that require regulatory intervention, growers adopted this strategy voluntarily, apparently because of advantages that may include better performance as well as lower costs for seeds and insecticides.sustainability | evolution | resistance management | genetically modified | refuge G enetically engineered crops that produce insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) have been planted globally on a cumulative total of over 732 million ha since 1996 (1). The benefits of these Bt crops include pest suppression, reduced insecticide use, enhanced biological control, and increased farmer profits (2-7). However, increasingly rapid evolution of resistance to Bt crops by pests has eroded these benefits (8-11). The main strategy for delaying pest resistance to Bt crops aims to increase the survival of susceptible insects with "refuges" of host plants that do not produce Bt toxins (9). Although refuges can delay insect adaptation to Bt crops (2, 3, 9, 12), the optimal spatial scale for planting refuges remains unresolved (13-15). Also, because refuges are often perceived to cause short-term economic sacrifices for growers, they are usually imposed by regulations.Before 2010, regulations in the United States mandated refuges of non-Bt plants in blocks consisting of separate fields, rows, or strips (14). In 2010, the regulations were modified to include mixtures of Bt and non-Bt seeds generating a random array of Bt and non-Bt plants side by side within...

show abstract

“…Hendry et al 2010), pollution (Levinton et al 2003), invasive species (Cox 2004), and climate change (Bernardo et al 2007;Urban et al 2012). Evolutionary processes are also crucial in relation to the emergence of infectious diseases (Pybus and Rambaut 2009), the development of resistance to antibiotics (Davies and Davies 2010) and pesticides (Heap 1997) and GM crops (Tabashnik 2008;Dhurua and Gujar 2011). These studies reveal a wide range of situations of interest to humans, where the presence of genetic diversity was critical in enabling change, both beneficial and detrimental, over ecological time scales.…”

Section: Evosystem Services Results From Evolutionary Mechanismsmentioning

confidence: 99%

Biodiversity only makes sense in the light of evolution

et al. 2014

View full text Add to dashboard Cite

The article discusses the significant role of biodiversity in the evolution. Topics discussed include importance of applying evolutionary principles in conservation and human well-being, fundamental relevance of evolution in the production, maintenance, and future of biodiversity and biodiversity arises from the approach that treats groups of taxa with similar traits as a significant functional unit.

show abstract

Field‐evolved resistance to Bt toxin Cry1Ac in the pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae), from India

Cited by 295 publications

References 29 publications

Interação de proteínas Cry1 e Vip3A de Bacillus thuringiensis para controle de lepidópteros-praga

Interação de proteínas Cry1 e Vip3A de Bacillus thuringiensis para controle de lepidópteros-praga

Hybridizing transgenic Bt cotton with non-Bt cotton counters resistance in pink bollworm

Biodiversity only makes sense in the light of evolution

Contact Info

Product

Resources

About