Embryogenesis and oögenesis in alate virginoparae, gynoparae, and oviparae of the aphid Myzus persicae, in relation to photoperiod

摘要: Abstract The study reports on the effects of prenatal and/or postnatal exposures to short-night or long-night conditions, and crowding, embryogenesis oogenesis in alate virginoparae, gynoparae, oviparae a holocyclic strain green peach aphid, Myzus persicae, from Yakima, Washington State. In virginoparae raised at density 10–20 per radish seedling regime (8 hr darkness diem), 3–4 embryos occurred each their 10 ovarioles, when aphids attained adulthood. More than 30 larvae were deposited by most these alatae. However, young adult densities (15 only one viable embryo (a presumptive ovipara) ovariole. follicle containing this was followed 1–2 abnormal follicles ovariole, number gynopara generally less 10. similarly under regime, egg typically eggs an ovipara (only after it had mated) numbered Alate gynoparae contained additional some ovarioles morphs lower (1–5 plant). Presumptive partially developed reproductive features transferred birth; converse true early larval life. Oviparae maintained short nights before birth appearance apterous but still produced rather embryos. enhanced (10–20) them without prior mating. Under all regimes tested, always larviposition sequence mothers, never exceeded 15. possible involvement juvenile hormone regulation events ecological significance results are discussed.