Unknown,Transcriptomics,Genomics,Proteomics

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Transcriptional analysis of physiological pathways in a generalist herbivore: responses to different host plants and plant structures by the cotton bollworm (CBW) Helicoverpa armigera [DifferentHost]

ABSTRACT: Transcriptional profiling comparing gut tissue from fifth instar larvae exposed to six different diets, namely cotton fruit or boll (B), tobacco flower bud (TFB), bean pod (BP), chick pea fruit (CKPF), pinto bean-based artificial diet (PB) and wheat-based artificial Lepidoptera diet (BIO). The generalist lepidopteran herbivore Helicoverpa armigera can feed on more than 87 plant species belonging to 48 families. However, life table studies on different crops have revealed that cotton and corn are the most suitable hosts of this pest and tomato, hot pepper and tobacco are suboptimal. It is believed that generalists owe their success to the deployment of various members of multigene families of detoxicative and digestive enzymes, a strategy that may also be responsible for rapid evolution of insecticide resistance. However studies of generalist adaptations have been limited to specific genes or gene families, and an overview of how these adaptations are orchestrated at the transcriptional level is lacking. We compared the transcript profiles of larval guts in response to differentially suitable hosts and towards two different artificial diets commonly used for laboratory rearing of this species, using a two-color alternating loop design microarray experiment. Two-color alternating loop design. Biological replicates: 4 (10 individuals per replicate). 24 samples total.

ORGANISM(S): Helicoverpa armigera

SUBMITTER: Maria de la Paz Celorio-Mancera

PROVIDER: E-GEOD-34346 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Cotton seeds (Gossypium hirsutum cv. CCRI12) were grown in a growth chamber under 29/25Â°C temperature and a 16:8 h light:dark cycle, and water was added every two days. All plants were used in experiments at the 6-7 fully expanded true leaf stage, which occurred 5-6 weeks after sowing. Cotton bollworm (CBW; Helicoverpa armigera) larvae were reared on an artificial diet and maintained at 27 Â± 2Â°C, 75 Â± 10% relative humidity, and 14:10 h light:dark in the laboratory. For insect treatment, seven H. armigera larvae (third instars) were placed on a group of three plants, which were kept within plastic bags (30 Ã? 40 cm), until time of harvest, with samples for each time point maintained separately. Undamaged plants maintained under the same conditions were used as controls. Cotton leaves from control plants and plants exposed to H. armigera were harvested at 6 h, 12 h, 24 h, and 48 h after onset of herbivory. For each treatment group and time point, cotton leaves were harvested from the three plants per treatment group and flash frozen in liquid nitrogen. For each time point, three replicate treatments and controls were performed. For insect treatment, seven H. armigera larvae (third instars) were placed on a group of three plants, which were kept within plastic bags (30 Ã? 40 cm), until time of harvest, with samples for each time point maintained separately. Undamaged plants maintained under the same conditions were used as controls. Cotton leaves from control plants and plants exposed to H. armigera were harvested at 6 h, 12 h, 24 h, and 48 h after onset of herbivory. For each treatment group and time point, cotton leaves were harvested from the three plants per treatment group and flash frozen in liquid nitrogen. For each time point, three replicate treatments and controls were performed. In this study we present dynamic transcriptome analysis and volatile profiling of cotton plants fed upon by larvae of a leaf-chewing herbivore CBW. Plant transcriptomic changes induced by CBW were analyzed using Affymetrixâ??s Cotton GeneChips. Samples from a time course of six hour to 48 hours following onset of CBW feeding were analyzed to identify target genes and key pathways involved in the activation of herbivory-induced indirect defense and to explore genetic basis of such defense. In addition, we monitored the accumulation of VOCs, which represent changes in cotton plant phenotype, following CBW infestation.

Dataset Information

Transcriptional analysis of physiological pathways in a generalist herbivore: responses to different host plants and plant structures by the cotton bollworm (CBW) Helicoverpa armigera [DifferentHost]

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