Parâmetros biológicos da lagarta falsa-medideira em cultivares de algodoeiro com as proteínas Cry1Ac e Cry1F

Viana, Daniela de Lima; Netto, Jacob Crosariol; Aguirre-Gil, Oniel Jeremías; Busoli, Antônio Carlos

doi:10.1590/s0100-204x2014000700010

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…Here, the clear absence of positive cross-resistance to Cry1Fa and Cry2Aa provides empirical evidence that these toxins do not share binding sites in receptor proteins 61,70 . These findings are relevant because Cry2A or Cry1F toxins are pyramided with Cry1Ac in second-generation Bt cotton 71,72 and soybean 13,14 in the Americas. Most importantly, our results indicate that Cry2A and/or Cry1F are compatible with Cry1Ac in a multi-toxin approach for resistance management of soybean looper.…”

Section: Discussionmentioning

confidence: 94%

Negative cross-resistance between structurally different Bacillus thuringiensis toxins may favor resistance management of soybean looper in transgenic Bt cultivars

Rodrigues‐Silva¹,

Canuto²,

Oliveira³

et al. 2019

Sci Rep

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High adoption rates of single-gene Bacillus thuringiensis (Bt) Cry1Ac soybean impose selection pressure for resistance in the soybean looper, Chrysodeixis includens, a major defoliator in soybean and cotton crops. To anticipate and characterize resistance profiles that can evolve, soybean looper larvae collected from field crops in Brazil in 2013 were selected for resistance to Cry1Ac. Using two methods of selection viz., chronic exposure to Cry1Ac cotton leaves and the seven-day larval exposure to purified Cry1Ac on the artificial diet, 31 and 127-fold resistance was obtained in 11 and 6 generations of selection, respectively. The resistance trait had realized heritability of 0.66 and 0.72, respectively, indicating that most of the phenotypic variation in Cry1Ac susceptibility of the soybean looper larvae was due to additive genetic variation. The Cry1Ac-selected populations showed positive cross-resistance to Cry1Ab (6.7–8.7 fold), likely because these Bt toxins have a very similar molecular structure. Importantly, the Cry1Ac-selected populations became more susceptible to Cry2Aa and Cry1Fa, showing negative cross-resistance (up to 6-fold, P < 0.05). These results indicate that Cry1Ac, Cry1Fa, and Cry2A are compatible in a multi-toxin approach to minimize the risk of rapid adaptation of the soybean looper to Bt toxins.

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Section: Discussionmentioning

confidence: 94%

Negative cross-resistance between structurally different Bacillus thuringiensis toxins may favor resistance management of soybean looper in transgenic Bt cultivars

Rodrigues‐Silva¹,

Canuto²,

Oliveira³

et al. 2019

Sci Rep

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“…A não interferência do alimento ofertado na fase larval na formação de pupas e viabilidade de adultos também pode ser observada por Viana et al (2014) que ao avaliar os parâmetros biológicos da lagarta falsamedideira em cultivares de algodoeiro com as proteínas Cry1Ac e Cry1F, observaram que a proteína que as lagartas mais apresentaram capacidade de resistência foi a Cry 1Ac, pois 62% das C. includens sobreviveram e se transformaram em pupas normais. Boiça junior et al (2015) Para os dados de peso de 12 dias, peso de pupa e total de dias não houve diferença significativa (p > = 0.05) (Tabela 6), diferente dos resultados obtidos no experimento 1, em que apenas a variá-vel de fase larval apresentou diferença significativa, fato este que pode estar relacionado a dieta artificial ofertada aos insetos até atingirem o 2° instar.…”

Section: Biologia De C Includens Em Cultivares De Sojaunclassified

Avaliação De Resistência a Chrysodeixis Includens Walter, 1858 (Lepidoptera: Noctuidae) E Monitoramento De Insetos Fitófagos De Cultivares De Soja (Glycine Max L. Merril)

Soares¹,

Salvador²

2017

Múltiplos Olhares Sobre a Biodiversidade - Vol. V

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INTRODUÇÃOO Brasil é responsável por grande parte da produção agrícola mundial, com disponibilidade de terras aptas para plantio, água em abundância, condições climáticas favoráveis e domínio da tecnologia de agricultura tropical (BRASIL, 2013). Dentro deste cenário, a cultura da soja (Glicyne max M.) ganha cada vez mais destaque devido ao avanço da demanda global por alimentos e à diversidade da utilização desta oleaginosa (USDA, 2010). O Brasil é o segundo maior produtor de soja do mundo, sendo esta a principal cultura de exportação brasileira e a espécie vegetal de maior importância econômica (CONAB, 2016).A produtividade de diferentes espécies vegetais pode ser negativamente afetada pela ação de insetos-praga, sendo estes responsáveis, juntamente com doenças e plantas daninhas, por perdas da ordem de 38% na produtividade em termos mundiais (GALLO et al, 2002). Além dos insetos que tradicionalmente atacam esta cultura, pragas antes consideradas secundárias, têm surgido com frequên-cia, preocupando os agricultores pelas dificuldades em seu manejo. Como exemplo, pode ser citada a lagarta falsa-medideira, Chrysodeixis includens Walter, 1858 (Lepidoptera: Noctuidae), que tem sido relacionada como importante desfolhador da cultura da soja desde 2003.

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“…The cotton leafworm, Alabama argillacea (Hübner, 1818) and the soybean looper, Chrysodeixis includens (Walker, 1857) (Lepidoptera: Noctuidae) are cotton defoliator pests (Viana et al, 2014). These Lepidoptera pests have different specialization levels (monophagy and polyphagy) on cotton plants, and are controlled with synthetic chemical insecticides (Oliveira et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of Alabama argillacea and Chrysodeixis includens (Lepidoptera: Noctuidae) larvae to Beauveria bassiana associated with kaolin

2021

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The mortality of the Alabama argillacea and Chrysodeixis includens (Lepidoptera: Noctuidae) larvae caused by the kaolin inert powder and the entomopathogenic fungus Beauveria bassiana were determined under laboratory conditions. Using the caterpillar submersion method, the CG 138 B. bassiana isolate was more pathogenic to A. argillacea than the CG 70, GC 82, ESALQ 634, and ESALQ 645. All five tested isolates caused similar mortality of C. includens. The mortality of first-instar larvae of A. argillacea and C. includens by feeding on leaf-disc impregnated with B. bassiana (CG 138) and kaolin was also determined. Higher A. argillacea mortalities were observed in the B. bassiana (CG 138) treatments, regardless of the presence of kaolin. However, the activity of kaolin + B. bassiana (CG 138) against C. includens was higher than each ingredient alone, indicating an additive action against C. includes larvae. The mortality of A. argillacea and C. includens larvae treated with kaolin + B. bassiana (CG 138) was similar, and the A. argillacea mortality was higher than that of C. includens with kaolin and B. bassiana (GC 138) separated. The treatment kaolin + B. bassiana (CG 138) is promising for the simultaneous management of these two defoliator pests, mainly A. includes. In addition, the monophagous A. argillacea is more susceptible to both kaolin and B. bassiana (GC 138) than the polyphagous C. includens, suggesting that the nutritional ecology plays an important role in the susceptibility of these defoliator species to alternative insecticides.

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Parâmetros biológicos da lagarta falsa-medideira em cultivares de algodoeiro com as proteínas Cry1Ac e Cry1F

Cited by 5 publications

References 5 publications

Negative cross-resistance between structurally different Bacillus thuringiensis toxins may favor resistance management of soybean looper in transgenic Bt cultivars

Negative cross-resistance between structurally different Bacillus thuringiensis toxins may favor resistance management of soybean looper in transgenic Bt cultivars

Avaliação De Resistência a Chrysodeixis Includens Walter, 1858 (Lepidoptera: Noctuidae) E Monitoramento De Insetos Fitófagos De Cultivares De Soja (Glycine Max L. Merril)

Susceptibility of Alabama argillacea and Chrysodeixis includens (Lepidoptera: Noctuidae) larvae to Beauveria bassiana associated with kaolin

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