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Upregulation of Insulin and Ecdysone Signaling in Relation to Diapause Termination in Eggs Exposed to 5 °C.
Insects
December 2024
Department of Biology, National Museum of Natural Science, 1 Kuan-Chien Road, Taichung 404, Taiwan.
In the present study, we investigated the possible correlation between insulin/ecdysone signaling and chilling-induced egg diapause termination in . Changes in () and () gene expression levels in chilled eggs (whose diapause had been terminated by chilling to 5 °C for 90 days) exhibited no significant increase after being transferred to 25 °C, which differed from both non-diapause eggs and HCl-treated eggs. We further compared the differential temporal expressions of (, -, and ), ( and ), and ( () and ()) as well as () genes between chilled eggs and eggs kept at 25 °C.
View Article and Find Full Text PDFExpression Variations of Chloride Ion Channel Related Genes During Diapause Termination in Silkworm, Bombyx mori.
Arch Insect Biochem Physiol
December 2024
Department of Sericultural Science, College of Animal Science, South China Agricultural University, Guangzhou, China.
Instant and refrigerated acid soaking are commonly used in cocoon production to prevent or break diapause, and provide developable silkworm eggs for sericulture, while their mechanisms have not been fully understood. This study aims to investigate the mechanisms by which hydrochloric acid (HCl) or dimethyl sulfoxide (DMSO) promotes embryonic development in silkworm Bombyx mori, focusing on the chloride ion (Cl) related gene expression profiles. Our results revealed that the HCl treatment of up to 6 min enhanced hatchability in freshly picked and cold-stored eggs, whereas a slight decrease in hatchability was observed in those treated with DMSO for 40 min.
View Article and Find Full Text PDFOverwintering at multiple life stages in Schizotetranychus shii (Acari: Tetranychidae), a specialist of evergreen chinquapin.
Exp Appl Acarol
December 2024
Faculty of Agriculture and Marine Science, Kochi University, 200 Monobeotsu, Nankoku, Kochi, 783-8502, Japan.
Spider mites (Acari: Tetranychidae) overwinter as eggs or adult females, but some do so as multiple life stages on evergreen hosts. However, proximate factors influencing such overwintering stages remain poorly understood. This study investigated photoperiodic responses and life-stage compositions during winter in a population of Schizotetranychus shii, a specialist of Japanese chinquapin (Fagaceae).
View Article and Find Full Text PDFFirst ontogenesis and bioecological study of Sciobia bouvieri (Orthoptera, Gryllidae), a North African endemic species.
Zootaxa
May 2024
Plant protection laboratory in agricultural and natural environments against crop pests; Department of Agricultural and Forestry Zoology; ENSA; El Harrach; Algiers; Algeria.
Article Synopsis
- * The life cycle consists of three stages: egg, nymph (with six instars averaging 306.5 days), and adult (males live around 32 days, while females about 24 days).
- * The species has a univoltine life cycle with summer and winter diapauses during the nymphal stages, influenced by light and temperature variations.
Effects of temperature and humidity on the survival and hatching response of diapausing and non-diapausing Aedes aegypti eggs.
J Insect Physiol
December 2024
Instituto de Limnología "Dr. Raúl A. Ringuelet", Universidad Nacional de La Plata-CONICET, CCT La Plata, Boulevard 120 y 62 N° 1437, La Plata (B 1900), Buenos Aires, Argentina.
Article Synopsis
- Insects like Aedes aegypti can enter diapause, a survival strategy triggered by shorter daylight, allowing them to withstand harsh winter conditions, especially in temperate regions.* -
- This study focused on comparing the survival of diapausing (D) and non-diapausing (ND) mosquito eggs from two areas in Argentina—Buenos Aires and San Bernardo—under different temperature and humidity conditions.* -
- Results revealed that D eggs had higher survival rates at low humidity and showed better tolerance to cold, particularly in harsher climates, while ND eggs varied in their tolerances based on location.*
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