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22 results for “Heliothis”
Fig. 1 in Percentage damage to tomatillo crops by Heliothis subflexa (Lepidoptera: Noctuidae) at various altitudes
Fig. 1. Percentages of tomatillo fruits infested by Heliothis subflexa along an altitudinal transect of tomatillo production areas in the state of Morelos, Mexico. The tomatillo field locations, m asl, and percentages of damaged fruits were as follows: Coatlán del Río (660 m asl, 48%); Miacatlán (810 m asl, 52%); Yautepec (1,120 m asl, 42%); Tlayacapan (1,320 m asl, 55%); and Tlanepantla (1,550 m asl, 21%; 1,800 m asl, 9%, and 2,300 m asl, 2%).
Fig. 2 in Antibiosis in soybean cultivars to Heliothis virescens (Lepidoptera: Noctuidae)
Fig. 2. Principal component analysis plot showing the distribution of different soybean cultivars fed to Heliothis virescens in Urutaí, Goiás, Brazil.
Fig. 1 in Antibiosis in soybean cultivars to Heliothis virescens (Lepidoptera: Noctuidae)
Fig. 1. Dendrogram based on the biological parameters of Heliothis virescens larvae fed different soybean cultivars in Urutaí, Goiás, Brazil. The hierarchical cluster analysis was performed using Ward's method with Euclidean distances as the measure of dissimilarity. The arrow indicates the distance used to separate the groups.
Fig. 1 in First record of Heliothis virescens (Lepidoptera: Noctuidae) damaging table grape bunches
Fig. 1. Larva of Heliothis virescens damaging grape bunches.
Fig. 3 in First record of Heliothis virescens (Lepidoptera: Noctuidae) damaging table grape bunches
Fig. 3. Holes made by Heliothis virescens in berries of a grape bunch.
Fig. 2 in First record of Heliothis virescens (Lepidoptera: Noctuidae) damaging table grape bunches
Fig. 2. Grape bunch damaged by Heliothis virescens worthless for the fresh market.
Data from: Application of a dense genetic map for assessment of genomic responses to selection and inbreeding in Heliothis virescens
Adaptation of pest species to laboratory conditions and selection for resistance to toxins in the laboratory are expected to cause inbreeding and genetic bottlenecks that reduce genetic variation. Heliothis virescens, a major cotton pest, has been colonized in the laboratory many times, and a few laboratory colonies have been selected for Bacillus thuringiensis (Bt) resistance. We developed 350-bp double-digest restriction-site associated DNA-sequencing (ddRAD-seq) molecular markers to examine and compare changes in genetic variation associated with laboratory adaptation, artificial selection and inbreeding in this nonmodel insect species. We found that allelic and nucleotide diversity declined dramatically in laboratory-reared H. virescens as compared with field-collected populations. The declines were primarily a result of the loss of low frequency alleles present in field-collected H. virescens. A further, albeit modest decline in genetic diversity was observed in a Bt-selected population. The greatest decline was seen in H. virescens that were sib-mated for 10 generations, in which more than 80% of loci were fixed for a single allele. To determine which regions of the genome were resistant to fixation in our sib-mated line, we generated a dense intraspecific linkage map containing three PCR-based and 659 ddRAD-seq markers. Markers that retained polymorphism were observed in small clusters spread over multiple linkage groups, but this clustering was not statistically significant. Overall, we have confirmed and extended the general expectations for reduced genetic diversity in laboratory colonies, provided tools for further genomic analyses and produced highly homozygous genomic DNA for future whole genome sequencing of H. virescens.
Data from: The genetic architecture of a complex ecological trait: host plant use in the specialist moth, Heliothis subflexa
We used genetic mapping to examine the genetic architecture of differences in host plant use between two species of noctuid moths, Heliothis subflexa, a specialist on Physalis spp., and its close relative, the broad generalist H. virescens. We introgressed H. subflexa chromosomes into the H. virescens background and analyzed 1,462 backcross insects. The effects of H. subflexa-origin chromosomes were small when measured as the percent variation explained in backcross populations (0.2 to 5%), but were larger when considered in relation to the interspecific difference explained (1.5 to 165%). Most significant chromosomes had effects on more than one trait, and their effects varied between years, sexes, and genetic backgrounds. Different chromosomes could produce similar phenotypes, suggesting that the same trait might be controlled by different chromosomes in different backcross populations. It appears that many loci of small effect contribute to the use of Physalis by H. subflexa. We hypothesize that behavioral changes may have paved the way for physiological adaptation to Physalis by the generalist ancestor of H. subflexa and H. virescens.
Figure 5 from: Paudel Timilsena B, Mikó I (2017) Know your insect: The structural backgrounds of regurgitation, a case study on Manduca sexta and Heliothis virescens (Lepidoptera: Sphingidae, Noctuidae). Research Ideas and Outcomes 3: e11997. https://doi.org/10.3897/rio.3.e11997
Figure 5 - CLSM volume rendered micrograph showing the junction of foregut and midgut of Manduca sexta larva
Figure 4 from: Paudel Timilsena B, Mikó I (2017) Know your insect: The structural backgrounds of regurgitation, a case study on Manduca sexta and Heliothis virescens (Lepidoptera: Sphingidae, Noctuidae). Research Ideas and Outcomes 3: e11997. https://doi.org/10.3897/rio.3.e11997
Figure 4 - CLSM volume rendered micrograph showing midgut epithellium of Manduca sexta at the junction of foregut and midgut
Figure 3 from: Paudel Timilsena B, Mikó I (2017) Know your insect: The structural backgrounds of regurgitation, a case study on Manduca sexta and Heliothis virescens (Lepidoptera: Sphingidae, Noctuidae). Research Ideas and Outcomes 3: e11997. https://doi.org/10.3897/rio.3.e11997
Figure 3 - CLSM volume rendered micrograph showing the junction of foregut and midgut of Heliothis virescens larva
Figure 2 from: Paudel Timilsena B, Mikó I (2017) Know your insect: The structural backgrounds of regurgitation, a case study on Manduca sexta and Heliothis virescens (Lepidoptera: Sphingidae, Noctuidae). Research Ideas and Outcomes 3: e11997. https://doi.org/10.3897/rio.3.e11997
Figure 2 - Alimentary canal of early third instar larvae of Manduca sexta imaged by Light microscope
Figure 1 from: Paudel Timilsena B, Mikó I (2017) Know your insect: The structural backgrounds of regurgitation, a case study on Manduca sexta and Heliothis virescens (Lepidoptera: Sphingidae, Noctuidae). Research Ideas and Outcomes 3: e11997. https://doi.org/10.3897/rio.3.e11997
Figure 1 - Alimentary canal of early fourth instar larvae of Heliothis virescens imaged by Light microscope
Data from: Contemporary evolution of a Lepidopteran species, Heliothis virescens, in response to modern agricultural practices
Adaptation to human-induced environmental change has the potential to profoundly influence the genomic architecture of affected species. This is particularly true in agricultural ecosystems, where anthropogenic selection pressure is strong. Heliothis virescens primarily feeds on cotton in its larval stages and US populations have been declining since the widespread planting of transgenic cotton, which endogenously expresses proteins derived from Bacillus thuringiensis (Bt). No physiological adaptation to Bt toxin has been found in the field, so adaptation in this altered environment could involve: 1) shifts in host plant selection mechanisms to avoid cotton, 2) changes in detoxification mechanisms required for cotton-feeding versus feeding on other hosts, or 3) loss of resistance to previously used management practices including insecticides. Here we begin to address whether such changes occurred in H. virescens populations between 1997-2012, as Bt cotton cultivation spread through the agricultural landscape. For our study, we produced an H. virescens genome assembly and used this in concert with a ddRAD-seq enabled genome scan to identify loci with significant allele frequency changes over the 15 year period. Genetic changes at a previously described H. virescens insecticide target of selection were detectable in our genome scan, and increased our confidence in this methodology. Additional loci were also detected as being under selection, and we quantified the selection strength required to elicit observed allele frequency changes at each locus. Potential contributions of genes near loci under selection to adaptive phenotypes in the H. virescens cotton system are discussed.
Data Repository Assortative mate choice in Heliothis subflexa females in response to Ophryocystis elektroscirrha-like
<p>The repository of data gathered during the bachelor project.</p>
Data from: Contemporary evolution of a Lepidopteran species, Heliothis virescens, in response to modern agricultural practices
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Data from: Application of a dense genetic map for assessment of genomic responses to selection and inbreeding in Heliothis virescens
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Data from: Differential octopaminergic modulation of olfactory receptor neuron responses to sex pheromones in Heliothis virescens
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Data from: The genetic architecture of a complex ecological trait: host plant use in the specialist moth, Heliothis subflexa
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HT-SuperSAGE of the gut tissue of a Vip3A-resistant Heliothis virescens F. (Lepidoptera: Noctuidae) strain provides insights into its evolution and toxin adaptation
GEO Series GSE72228. Heliothis virescens. 2 samples. Type: Expression profiling by high throughput sequencing.
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