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A Marine Euplotes (Ciliophora, Hypotrichida) with Reduced Number of Prezygotic Micronuclear Divisions
Author(s) -
LUEKEN WOLFGANG W.
Publication year - 1973
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1973.tb06020.x
Subject(s) - biology , pronucleus , chromosome , chromosome number , division (mathematics) , zygote , genetics , gene , karyotype , arithmetic , mathematics , embryogenesis
SYNOPSIS In contradistinction to the pattern of 3 prezygotic micronuclear divisions found in 10 species of Euplotes , a marine species resembling Euplotes crassus in structure, has only 2 divisions. This atypical division pattern was observed in all matings involving the 4 available mating types. The critical stages of the nuclear events are demonstrated by using special strains having the micronuclear DNA content and chromosome number only 1/2 the normal values. The employment of such strains facilitates differentiation between the stationary and migratory pronuclei in a given conjugant and determination of the times of conclusion of prezygotic divisions and of the pronuclear exchange.