Ref ID : 3893
Guy Metenier and Claude-Alain Groliere; [Precisions Temporelles sur les Processus de la Stomatogenese de Tetrahymena paravorax analyses en Microscopie Photonique]. J.Protozool. 26(1):75-82, 1979
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An analysis of the morphogenetic sequences in the ciliate Tetrahymena paravorax has shown that: (A) The duration of predivision stomatogenesis in exponentially growing microstomes occupies 45% of the generation time (stage 1-20%; stage 2-3%; stage 3-3%; stage 4-5%; stage 6-9%). (B) Cytoplasmic division is unequal (the proters are smaller than opisthes); the initial size difference between the 2 fission products is presumably compensated by an increased growth period in the proter. (C) The maximum percentage of microstome-to-macrostome oral reorganization is ~/_70% in asynchronous populations, 210 min after suspension in stomatin. (D) Initiation of oral replacement stomatogenesis is associated with the end of a period which has a minimum duration nearly equal to that of stage 0 characteristic of the normal interdivision cycle of the microstomes; this initiation is delayed if exposure of microstomes to stomatin is begun at the onset of the cell cycle. (E) The buccal primordium formed in division can be resorbed in presence of stomatin and anterior stomatogenesis can start before the resorption is completed; this resorption is not induced if the cells have progressed beyond a point which precedes the beginning of cells furrowing (stage 5).