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MITOTIC INDUCTION AND SYNCHRONIZED CELL DIVISION IN OEDOGONIUM CARDIACUM (HASS.) WITTR.
Author(s) -
Fussell Catharine P.
Publication year - 1982
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1982.tb13257.x
Subject(s) - mitosis , biology , interphase , telophase , cell division , cell cycle , microbiology and biotechnology , botany , ploidy , anaphase , cell , genetics , gene
Waves of mitosis are induced in Oedogonium cardiacum grown under a 15 hr light/9 hr dark cycle. Mitosis starts 4 to 5 hr after the start of the dark period. Each mitotic stage has a high initial rate which plateaus at a lower rate for several additional hours. Partial synchronization of mitotic stages results from this induction of cell division. Mitotic divisions last 9 to 10 hr after induction. During the remainder of the 24‐hr light/dark cycle, cells are in interphase. Along a filament, several dividing cells tend to be adjacent, with the most advanced stage in the cap cell. Progressively earlier mitotic stages are basal to the dividing cap cell. This pattern of mitotic division differs from the state in nature where only the cap cell usually divides. Chromosomes probably maintain a telophase arrangement during interphase. The suitability and advantages of Oedogonium , a haploid alga with sexual reproduction, as an experimental plant for cytological, developmental, biochemical, and genetic studies is pointed out.