Diurnal rhythms in the synthesis and release of haemolymph proteins in the crustacean Isopoda, Porcellio dilatatus (Brandt), with special reference to vitellogenin

Abstract

Summary. Synthesis and release of vitellogenin in the crustacean Isopoda, Porcellio dilatatus, were maximal during premolt. At that time, diurnal variations occurred in the haemolymph protein level and in the synthesis and release of vitellogenin and other proteins in the haemolymph. The pattern of variations was always identical and bimodal : the minima were at dusk and at dawn when the maxima occurred in the middle of the day and of the night. These variations were highly significant, and the diurnal means were significantly higher than the nocturnal means.Introduction.

Review of recent studies on reproduction in terrestrial isopods

“…The vitellogenin is synthesized in the fat body (in Porcellio dilatatw Picaud 1980). There is a diurnal variation in both synthesis and release of hemolymph protein and in synthesis of vitellogenin (Gohar et al, 1983). Vitellogenin is eventually stored in special cells in the hepatopancreas (Picaud, 1980).…”

Action temporelle d'ecdystéroïdes sur la synthèse protéique ovarienne in vitro chez le Crustacé isopode terrestre Porcellio dilatatus (Brandt)

“…Ainsi, selon Besse et Maissiat (1971) (Gohar et al, 1983), aucune approche chronobiologique de l'effet des ecdystéroïdes sur la vitellogenèse n'a encore été tentée.…”

“…La vitellogénine et les vitellines étant des analogues antigéniques (Kerr, 1969 ;Croisille et al, 1974 ;Picaud, 1978) Gohar et al (1983) et Souty (1983). Le (Souty, 1980 ; Souty-Grosset, en préparation) comme chez de nombreux Crustacés (Zerbib, 1976(Zerbib, , 1980Charniaux-Cotton, 1980 …”