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55 results for “Helicoverpa”
Fig. 1 in Toxicity of the Jaburetox peptide to the multi-host insectpest Helicoverpa armigera (Lepidoptera: Noctuidae) larvae
Fig. 1. Feeding assay with neonate Helicoverpa armigera larvae on maize leaf discs coated with Jaburetox (Jbtx) and Jaburetox Δ-β (Jbtx Δ-β). (a) Accumulated mortality; (b) daily consumption. The arrow indicates the d Jaburetox toxin feeding was stopped. Means with the same letter within the same d do not differ with each other (Tukey test, P <0.05).
Fig. 2 in Toxicity of the Jaburetox peptide to the multi-host insectpest Helicoverpa armigera (Lepidoptera: Noctuidae) larvae
Fig. 2. Percentage of neonate larvae fed with leaf discs treated with Jaburetox, Jaburetox Δ-β, or control solutions that reached the third, fourth, and fifh instar at d 8 of experiment.
Fig. 4 in Toxicity of the Jaburetox peptide to the multi-host insectpest Helicoverpa armigera (Lepidoptera: Noctuidae) larvae
Fig. 4. (a) Percentage of third instar larvae fed with leaf discs treated with Jaburetox and control solution that reached the third, fourth, and fifh instar along the experiment; (b) larvae observed on d 8 of bioassay (1 d before all Jaburetox treated had died): on the lef, Jaburetox larvae are in third instar (80 µg per 5 cm2); on the right, control larvae are in the fifh instar.
Fig 3 in Toxicity of the Jaburetox peptide to the multi-host insectpest Helicoverpa armigera (Lepidoptera: Noctuidae) larvae
Fig 3. Feeding assay with third instar Helicoverpa armigera larvae on maize leaf discs coated with Jaburetox (Jbtx). (a) Accumulated mortality; (b) daily consumption; (c) larvae weight. The arrow indicates the d Jaburetox toxin feeding was stopped. Means with the same letter within the same d do not differ from each other (Student t-test, P <0.05).
Fig. 1 in Genetic identification and biological characterization of Baculovirus isolated from Helicoverpa armigera (Lepidoptera: Noctuidae) in Brazil
Fig. 1. Phylogenetic relationships among HearNPV isolates (BR1, BR2, BR3, Br4, and GEM) based on analysis of concatenated nucleotide sequences of the lef-8 and lef-9. The evolutionary history was inferred by using the Maximum Likelihood method. The tree with the highest log likelihood (−799.3699) is shown. The percentage of trees in which the associated taxa clustered together is shown next to the branches. Initial tree(s) for the heuristic search were obtained by applying the Neighbor-Joining method to a matrix of pairwise dis- tances estimated using the Maximum Composite Likelihood (MCL) approach. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site. The analysis involved 14 nucleotide sequences. All posi- tions containing gaps and missing data were eliminated.
Fig. 2 in Genetic identification and biological characterization of Baculovirus isolated from Helicoverpa armigera (Lepidoptera: Noctuidae) in Brazil
Fig. 2. Survival curves of Helicoverpa armigera (Lepidoptera: Noctuidae) afer feeding on corn leaves inoculated with 1 × 106 polyhedra per mL of baculovirus isolated. Gemstar®LC, BR1, BR2, BR3, BR4, and in control obtained with KaplanMeier estimator.
Impact of Helicoverpa zea salivary GOX on stomatal conductance and volatile emission of host plants
<p>This data set contain raw data associated with the manuscript titled "Silencing the alarm: An insect salivary enzyme closes plant stomata and inhibits volatile release". </p> <p>Herbivore-induced plant volatiles (HIPVs) are widely recognized as ecologically important to plant. While the majority of studies focused on the induction of this "cry for help", little is known about whether insect herbivores have evolved mechanisms to reduce the release of HIPVs. Here we show that a caterpillar (<em>Helicoverpa zea</em>) salivary enzyme, glucose oxidase (GOX), commonly secreted on plant leaves causes stomatal closure and reductions in emissions of several HIPVs involved in plant defenses. We found that application of GOX to wounded regions of leaves led to reductions in stomatal conductance on tomato (<em>Solanum lycopersicum</em>) and soybean (<em>Glycine max</em>) for at least two days. The role of GOX in reducing stomatal aperture was confirmed using GOX knockout lines of <em>H. zea</em> (CRISPR-Cas9 mutagenesis), and microscopic observations of stomata. In addition, GOX reduced the emission of several HIPVs during feeding by <em>H. zea</em>, including (Z)-3-hexenol, (Z)-jasmone, and (Z)-3-hexenyl acetate, which are important air borne signals in plant defenses. Our findings highlight a novel mechanism where insect herbivore reduces the release of HIPVs during feeding by targeting fundamental plant structure (i.e. stomata), and the link between of stomatal dynamics and releases of HIPVs. We demonstrate the existence of HIPVs-interfering mechanisms as a potential evolutionary strategy for insect herbivores to interfere with plant air borne signals.</p>
Functions of the Sulfatase-Modifying Factor 1 (HaSumf1) in the development and host glucosinolates adaptation of Helicoverpa armigera
<p>In this study, we detailed the indicators of development of <em>H. armigera</em>, such as growth and development period, number of surviving larvae, body weight, pupa weight, and number, as well as the relative expression levels of <em>HaSumf1</em> gene at different instars, and the third- and fifth-instars after feeding with glucosinolates and /or ds<em>Sumf1</em>.</p>
Nutritional physiology of Helicoverpa armigera
<p><strong><span>Relationship between nutritional and physiological responses of <em>Helicoverpa armigera </em>(Hübner) and phytochemical metabolites in various sesame cultivars</span></strong></p>
Videos of corn earworm (Helicoverpa zea) flight behavior around pheromone trap using infrared camera
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Functions of the Sulfatase-Modifying Factor 1 (HaSumf1) in the development and host glucosinolates adaptation of Helicoverpa armigera
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TGFβRI modulates metabolic reprogramming via the aPKC-PEPCK axis during pupal diapause in the cotton Bollworm, <em>Helicoverpa armigera</em>
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Impact of Helicoverpa zea salivary GOX on stomatal conductance and volatile emission of host plants
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Mutations in a novel cadherin gene associated with Bt resistance in Helicoverpa zea
Transgenic corn and cotton produce crystalline (Cry) proteins derived from the soil bacterium Bacillus thuringiensis (Bt) that are toxic to lepidopteran larvae. Helicoverpa zea, a key pest of corn and cotton in the U.S., has evolved widespread resistance to these proteins produced in Bt corn and cotton. While the genomic targets of Cry selection and the mutations that produce resistant phenotypes are known in other lepidopteran species, little is known about how selection by Cry proteins shape the genome of H. zea. We scanned the genomes of Cry1Ac-selected and unselected H. zea lines, and identified twelve genes on five scaffolds that differed between lines, including cadherin-86C (cad-86C), a gene from a family that is involved in Cry1A resistance in other lepidopterans. Although this gene was expressed in the H. zea larval midgut, the protein it encodes has only 17 to 22% identity with cadherin proteins from other species previously reported to be involved in Bt resistance. An analysis of midgut-expressed cDNAs showed significant between-line differences in the frequencies of putative nonsynonymous substitutions (both SNPs and indels). Our results indicate that cad-86C is a likely target of Cry1Ac selection in H. zea. It remains unclear, however, whether genomic changes at this locus directly disrupt midgut binding of Cry1Ac and cause Bt resistance, or indirectly enhance fitness of H. zea in the presence of Cry1Ac by some other mechanism. Future work should investigate phenotypic effects of these nonsynonymous substitutions and their impact on fitness of H. zea larvae that ingest Cry1Ac.
Virome of Helicoverpa armigera, Tuta absoluta, Nezara viridula
<p>Virome of Helicoverpa armigera, Tuta absoluta, Nezara viridula</p>
CRISPR/Cas9 mediated knockout of ABCC1 confers resistance to Bacillus thuringiensis toxin Cry2Ab in Helicoverpa armigera
<p>This data contains the Bt and insecticide bioassay results of ABCC1 knockout and wild-type strain of <em>Helicoverpa armigera</em>. Bioassay results revealed that the HaABCC1-KO strain exhibited >60-fold resistance to Cry2Ab toxin compared with the susceptible XJ strain, while no resistance has been recorded for Cry1Ab, Cry1Ac and Vip3A. Furthermore, the inheritance of <em>H. armigera</em> resistance to Cry2Ab was autosomal and completely recessive, significantly associated with the 4-nt deletion mutation of ABCC1 in the HaABCC1-KO strain. The relative growth of HaABCC1-KO and XJ strain also confirmed the role of <em>HaABCC1 </em>on the toxicity of Cry2Ab.</p>
Data from: High nucleotide diversity and limited linkage disequilibrium in Helicoverpa armigera facilitates the detection of a selective sweep
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Mutations in a novel cadherin gene associated with Bt resistance in Helicoverpa zea
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Data from: Oxidative stress delays development and alters gene expression in the agricultural pest moth, Helicoverpa armigera
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Data from: Invasion origin, rapid population expansion, and the lack of genetic structure of cotton bollworm (Helicoverpa armigera) in the Americas
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