Sexual reproduction of Alexandrium hiranoi (Dinophyceae)
1993
Kita, T. (Tokyo Univ. (Japan). Faculty of Agriculture) | Fukuyo, Y. | Tokuda, H. | Hirano, R.
The sexual reproduction of the dinoflagellate Alexandrium hiranoi Kita et Fukuyo was observed in clonal cultures under laboratory conditions. Two or four armored, isogamous gametes are produced by the division of a protoplasm inside a thin-walled non-motile cell without any change of culture condition. During swimming for 30 or 40 minutes, two gametes couple and fuse, and then transform into a quadriflagellated planozygote. The planozygote continues swimming for several days and increases in size. The enlarged planozygote attaches to the bottom of culture vessel and transforms into a hypnozygote, in which a meiotic division linked by nuclear cyclosis occurs. Two daughter cells are always released within 24 hours after formation of the hypnozygote, so meiosis of this species is uncoordinated. The hypnozygote is thin-walled, filled with many yellow-brown photosynthetic pigments. This species is a new member of dinoflagellates possessing hypnozygotes as temporary cysts
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Agriculture, Forestry and Fisheries Research Information Technology Center