Genetic Structure and Gene Flow Among Brazilian Populations of &lt;I&gt;Heliothis virescens&lt;/I&gt; (Lepidoptera: Noctuidae)

Domingues, Felipe A.; Silva-Brandão, Karina Lucas; Abreu, A. G. de; Perera, Omaththage P.; Blanco, Carlos A.; Cônsoli, Fernando L.; Omoto, Celso

doi:10.1603/ec12123

Cited by 13 publications

(19 citation statements)

References 68 publications

(72 reference statements)

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“…Another disadvantage of adopting the refuge-in-a-bag tactic, aimed at managing pest resistance in Brazil, is the scarcity of information on the mobility of target pests on transgenic plants, on the initial frequency of alleles that provide resistance, and on studies of the genetic structure of these populations [33]–[35].…”

Section: Discussionmentioning

confidence: 99%

Feeding and Dispersal Behavior of the Cotton Leafworm, Alabama argillacea (Hübner) (Lepidoptera: Noctuidae), on Bt and Non-Bt Cotton: Implications for Evolution and Resistance Management

et al. 2014

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The host acceptance of neonate Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) larvae to Bt cotton plants exerts a strong influence on the potential risk that this pest will develop resistance to Bt cotton. This will also determine the efficiency of management strategies to prevent its resistance such as the “refuge-in-the-bag” strategy. In this study, we assessed the acceptance of neonate A. argillacea larvae to Bt and non-Bt cotton plants at different temperatures during the first 24 h after hatching. Two cotton cultivars were used in the study, one a Bt DP 404 BG (Bollgard) cultivar, and the other, an untransformed isoline, DP 4049 cultivar. There was a greater acceptance by live neonate A. argillacea larvae for the non-Bt cotton plants compared with the Bt cotton plants, especially in the time interval between 18 and 24 h. The percentages of neonate A. argillacea larvae found on Bt or non-Bt plants were lower when exposed to temperatures of 31 and 34°C. The low acceptance of A. argillacea larvae for Bt cotton plants at high temperatures stimulated the dispersion of A. argillacea larvae. Our results support the hypothesis that the dispersion and/or feeding behavior of neonate A. argillacea larvae is different between Bt and non-Bt cotton. The presence of the Cry1Ac toxin in Bt cotton plants, and its probable detection by the A. argillacea larvae tasting or eating it, increases the probability of dispersion from the plant where the larvae began. These findings may help to understand how the A. argillacea larvae detect the Cry1Ac toxin in Bt cotton and how the toxin affects the dispersion behavior of the larvae over time. Therefore, our results are extremely important for the management of resistance in populations of A. argillacea on Bt cotton.

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Section: Discussionmentioning

confidence: 99%

Feeding and Dispersal Behavior of the Cotton Leafworm, Alabama argillacea (Hübner) (Lepidoptera: Noctuidae), on Bt and Non-Bt Cotton: Implications for Evolution and Resistance Management

et al. 2014

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“…For example, late season pest management in pome fruit might rely on different pest management tools than those used in the early season on peach. This strategy holds the potential for two benefits: first, it can be adjusted optionally to the genotypes prevailing in the respective pest populations, and second, the alternation of the management approach in the second part of the season might contribute to limit univocal selection pressure and thus forced evolution of resistant pest genotypes [20], [59], [60].…”

Section: Discussionmentioning

confidence: 99%

High Genetic Diversity and Structured Populations of the Oriental Fruit Moth in Its Range of Origin

et al. 2013

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The oriental fruit moth Grapholita ( = Cydia) molesta is a key fruit pest globally. Despite its economic importance, little is known about its population genetics in its putative native range that includes China. We used five polymorphic microsatellite loci and two mitochondrial gene sequences to characterize the population genetic diversity and genetic structure of G. molesta from nine sublocations in three regions of a major fruit growing area of China. Larval samples were collected throughout the season from peach, and in late season, after host switch by the moth to pome fruit, also from apple and pear. We found high numbers of microsatellite alleles and mitochondrial DNA haplotypes in all regions, together with a high number of private alleles and of haplotypes at all sublocations, providing strong evidence that the sampled area belongs to the origin of this species. Samples collected from peach at all sublocations were geographically structured, and a significant albeit weak pattern of isolation-by-distance was found among populations, likely reflecting the low flight capacity of this moth. Interestingly, populations sampled from apple and pear in the late season showed a structure differing from that of populations sampled from peach throughout the season, indicating a selective host switch of a certain part of the population only. The recently detected various olfactory genotypes in G. molesta may underly this selective host switch. These genetic data yield, for the first time, an understanding of population dynamics of G. molesta in its native range, and of a selective host switch from peach to pome fruit, which may have a broad applicability to other global fruit production areas for designing suitable pest management strategies.

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“…For these regions, the planning of the production of cotton and soybeans is particularly important for IRM, because periods with no selection pressure could prevent or slow the increase in the frequency of resistant individuals in the field. Another aspect to be considered for IRM is the absence of genetic structure among populations of H. virescens in cotton and soybean crops, which may favor the spread of alleles that confer resistance among populations of this insect pest and accelerate the evolution of resistance . Considering this scenario, it is extremely important to consider the particularities of different selection pressures that H. virescens will be exposed to so to have more coordinated IRM strategies in Brazil across crops.…”

Section: Discussionmentioning

confidence: 99%

“…4 -6 In Brazil, the current system of growing cotton and soybean with overlapping and/or succession of these crops in the field potentially exposes populations of Heliothis virescens to intense selection pressure for the Cry1Ac protein, increasing the risk of selection of resistant individuals. 7,8 The ability of H. virescens to evolve resistance to Cry1Ac was reported for a laboratory strain (YHD-2), which exhibited resistance ratio > 10 000-fold after 19 generations of selection pressure with Cry1Ac incorporated into artificial diet. 9 Another laboratory strain (KCB) showed a resistance ratio to Cry1Ac of ≈ 400 fold.…”

Section: Introductionmentioning

confidence: 99%

High levels of biological activity of Cry1Ac protein expressed on MON 87701 × MON 89788 soybean against Heliothis virescens (Lepidoptera:Noctuidae)

Bernardi¹,

Dourado

Carvalho

et al. 2013

Pest Management Science

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Genetic Structure and Gene Flow Among Brazilian Populations of <I>Heliothis virescens</I> (Lepidoptera: Noctuidae)

Cited by 13 publications

References 68 publications

Feeding and Dispersal Behavior of the Cotton Leafworm, Alabama argillacea (Hübner) (Lepidoptera: Noctuidae), on Bt and Non-Bt Cotton: Implications for Evolution and Resistance Management

Feeding and Dispersal Behavior of the Cotton Leafworm, Alabama argillacea (Hübner) (Lepidoptera: Noctuidae), on Bt and Non-Bt Cotton: Implications for Evolution and Resistance Management

High Genetic Diversity and Structured Populations of the Oriental Fruit Moth in Its Range of Origin

High levels of biological activity of Cry1Ac protein expressed on MON 87701 × MON 89788 soybean against Heliothis virescens (Lepidoptera:Noctuidae)

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