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- W4244448661 abstract "Haemolymph ecdysteroids of larvae and pupae of the fruit fly Anastrepha suspensa and its endoparasitic wasp Biosteres (= Opius) longicaudatus were measured by radioimmunoassay. The ability of parasite first instar larvae to sequester and metabolize ecdysone from an artificial medium was also evaluated. From the third larval instar until the pharate pupal stage of parasitized hosts ecdysteroid titres increased from 30.9 ± 1.8 to 224 ± 5.3 pg/μl. Titres of the corresponding unparasitized stages ranged from 56 ± 9.3 to 280 ± 6.1 pg/μl. In both parasitized and unparasitized individuals titres fell sharply on the day when apolysis and pupal cuticle synthesis occurred. They increased again as pupal development progressed. Ecdysteroid levels of the parasite increased during the first larval instar and remained unchanged until the parasite's third instar. The levels fell in the newly moulted parasite fourth instar but thereafter increased sharply until the larval-pupal moult 2 days later. The predominant free ecdysteroid in parasitized and healthy A. suspensa pharate pupae was ecdysone while in the fourth instar parasite it was 20-OH-ecdysone. Parasites in vitro were able to take up [3H]ecdysone from a medium and convert it to 20-OH-ecdysone. This suggests that they may be able to sequester ecdysteroids from the hosts' haemolymph." @default.
- W4244448661 created "2022-05-12" @default.
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- W4244448661 date "1986-01-01" @default.
- W4244448661 modified "2023-09-26" @default.
- W4244448661 title "RELATIONSHIP BETWEEN THE ECDYSTEROID TITRES OF A HOST AND THOSE OF ITS PARASITE" @default.
- W4244448661 doi "https://doi.org/10.1016/b978-0-08-032016-8.50025-8" @default.
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