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SEXUAL REPRODUCTION IN THE FRESHWATER DINOFLAGELLATE GLOEODINIUM MONTANUM 1
Author(s) -
Kelley Ingrid,
Pfiester Lois A.
Publication year - 1990
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1990.00167.x
Subject(s) - biology , zygote , homothallism , budding , dinoflagellate , sexual reproduction , gamete , botany , germination , cell division , protoplast , embryo , microbiology and biotechnology , cell , mating type , sperm , embryogenesis , biochemistry , gene
ABSTRACT The sexual life cycle of Gloeodinium montanum Klebs was examined with light and scanning electron microscopy. In unialgal cultures G. montanum divided predominantly by simple division, giving rise to two nonmotile cells. When placed in fresh medium, 2–4 biflagellated swarmers were formed from the vegetative cells. Swarmers developed directly into vegetative cells or acted as gametes. Both isogamy and anisogamy were observed. Gloeodinium montanum is homothallic. Fusion occurred in the non‐motile state producing a large aplanozygote, which germinated after approximately two months to a year or more. Zygote germination liberated four aplanospores. Budding of the zygote, resulting from unequal division of the protoplast and multiple fusion attempts also were observed.