Life Sciences Commons^™

Impact Of Sublethal Exposure To A Pyrethroid-Neonicotinoid Insecticide On Mating, Fecundity And Development In The Bed Bug Cimex Lectularius L. (Hemiptera: Cimicidae), Sydney E. Crawley, Jennifer R. Gordon, Katelyn A. Kowles, Michael F. Potter, Kenneth F. Haynes

Entomology Faculty Publications

Sublethal exposure to an insecticide may alter insect feeding, mating, oviposition, fecundity, development, and many other life history parameters. Such effects may have population-level consequences that are not apparent in traditional dose-mortality evaluations. Earlier, we found that a routinely used combination insecticide that includes a pyrethroid and a neonicotinoid (Temprid^® SC) had deleterious effects on multiple bed bug (Cimex lectularius, L.) behaviors. Here, we demonstrate that sublethal exposure impacts physiology and reproduction as well. We report that sublethal exposure to Temprid SC has variable aberrant effects on bed bugs depending on the strain, including: a reduction in …

The Foxo Transcription Factor Controls Insect Growth And Development By Regulating Juvenile Hormone Degradation In The Silkworm, Bombyx Mori, Baosheng Zeng, Yuping Huang, Jun Xu, Takahiro Shiotsuki, Hua Bai, Subba Reddy Palli, Yongping Huang, Anjiang Tan

Entomology Faculty Publications

Forkhead box O (FOXO) functions as the terminal transcription factor of the insulin signaling pathway and regulates multiple physiological processes in many organisms, including lifespan in insects. However, how FOXO interacts with hormone signaling to modulate insect growth and development is largely unknown. Here, using the transgene-based CRISPR/Cas9 system, we generated and characterized mutants of the silkworm Bombyx mori FOXO (BmFOXO) to elucidate its physiological functions during development of this lepidopteran insect. The BmFOXO mutant (FOXO-M) exhibited growth delays from the first larval stage and showed precocious metamorphosis, pupating at the end of the fourth instar (trimolter) rather …

Transcriptomic Response Of Wolf Spider, Pardosa Pseudoannulata, To Transgenic Rice Expressing Bacillus Thuringiensis Cry1ab Protein, Juan Wang, Yuande Peng, Kaifu Xiao, Baoyang Wei, Jilin Hu, Zhi Wang, Qisheng Song, Xuguo Zhou

Entomology Faculty Publications

Background: Bacillum thuringiensis (Bt) toxin produced in Cry1-expressing genetically modified rice (Bt rice) is highly effective to control lepidopteran pests, which reduces the needs for synthetic insecticides. Non-target organisms can be exposed to Bt toxins through direct feeding or trophic interactions in the field. The wolf spider Pardosa pseudoannulata, one of the dominant predators in South China, plays a crucial role in the rice agroecosystem. In this study, we investigated transcriptome responses of the 5th instar spiders fed on preys maintained on Bt- and non-Bt rice.

Results: Comparative transcriptome analysis resulted in 136 differentially expressed genes (DEGs) …