On the contribution of the follicle epithelium to the deposition of yolk in the oocyte of Panorpa communis (Mecoptera)

Unusual Intertrophocytic Position of Follicle Cells in the Nurse Chamber of the Honeybee Queen Ovary (Apis Mellifica)

“…They arise from repeated mitotic activity of the prefollicular tissue in the posterior region of the germarium and are generally believed ' to be of somatic origin (BoriHAG, 1958 (BIER, 1962;R AMAMURTY , 1964;E NGELS , 1973) (PauLCxE, 1901;E NGELS , 1968 (Fig. 3).…”

Cytochemical studies on growth and differentiation of oocyte and follicular epithelium in relation to the development of yolk in Acrida turrita(insecta: Orthoptera)

“…Histochemically the compound yolk of this insect is the admixture of carbohydrate (glycogen) and protein (protein-bound -NH2, -SH and -SS groups , tyrosine and arginine). The carbohydrateprotein complex nature of the compound yolk has been described in a large number of insects: Periplaneta (Nath et al 1958b, Bonhag 1959, Chrotogonus and Gryllodes (Nath et al 1958a), Labidura (Nath et al 1959), Oncopeltus (Bonhag 1955), Anisolabis (Bonhag 1956), Panorpa (Ramamurty 1968), Oxya (Verma and Das 1974), Chrysocoris (Verma and Basiston 1974), Locusta (Yamasaki 1974), Mylabris (Verma and Mohanty 1976), Cybister (Verma et al 1977), Atractomorpha (Basiston et al 1978), Aspongopus (Verma et al 1979). The carbohydrate content of yolk of all these insects includes glycogen.…”

“…Since these precursors react positively with PAS and mercuric bromphenol blue one may conclude that the hexose sugar (trehalose) and the protein content of blood are the main source for the synthesis of yolk. With the help of serological, histochemi cal, autoradiographic and ultrastructural studies the intercellular spaces in the follicular epithelium have been demonstrated in several insects to be the pathways for the entry of blood proteins and carbohydrate into the oocyte (Telfer 1961, Telfer and Melius 1963, Ramamurty 1964, 1968, 1970, Bier and Ramamurty 1964, Anderson 1964, Patchin and Davey 1968, Melius and Telfer 1969, Pratt and Davey 1972, Elliott and Gillott 1976, Verma et al 1979). Kessel and Beams (1963) in Oncopeltus, Roth and Porter (1964) in Aedes, Anderson (1964) in Periplaneta and Ramamurty (1970) in Panorpa have described the ultrastructural adaptation of the oocyte-follicle epithelium interface during vitellogenesis for the purpose of facilitating the transport of blood protein.…”

“…The studies primarily based on morphological data have been made (Telfer 1961, Bier 1962, Kessel and Beams 1963, Ramamurty 1964, 1968, Roth and Porter 1964, Anderson 1964, and Bier and Ramamurty 1964 to reveal certain structural adaptations of both oocyte and follicular cells, which facilitate the pinocytotic incorporation of blood protein during vitellogenesis in insects. Recently though coworkers (1974 to 1979) have studied the origin and composition of yolk in a number of insects, they have given little attention towards the underlying vitellogenesis-related changes in the follicular cells.…”

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“…The evidence supporting the uptake of vitellogenin in vitro was demonstrated by the injection of 1% vital dye trypan blue into the dorsal lymph sac of female anurans. [24][25][26][27] These studies showed that the uptake of trypan blue began in stage III oocytes and reached the maximal level in stage IV oocytes, then the activity declined in the last two stages. These results are similar to those reported by Wallace 28 (1970) using an in vitro study, and are also compatible with the increased pinocytotic vesicles in state III oocytes, and their decrease in stage V and VI oocytes as observed in the present study.…”