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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Imprimer: 1521-9429
ISSN En ligne: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v13.i1.20
pages 18-36

Sexual Reproduction and Mating System of the Diatom Tabularia tabulata (C. Agardh) Snoeijs (Bacillariophyta)

N. A. Davidovich
Karadag State Reserve, National Academy of Sciences of Ukraine, Kwortnoye settl., 98188 Feodosiya, Crimea, Ukraine
O. I. Davidovich
Karadag Nature Reserve, National Akademy of Sciences of Ukraine, 24, Nauki St., 98188 Kurortnoe, Feodosia, Crimea, Ukraine

RÉSUMÉ

The sexual reproduction and mating system of the diatom Tabularia tabulate were studied in clonal cultures. Cis-type anisogamous sexual reproduction was revealed. The mating system involves homo- and heterothallic modes of reproduction; and both male and female clones are capable of reproducing homothallically. The combination of homo- and heterothallic modes of reproduction gives certain evolutionary advantage; on the one hand, providing homozygous lines, and on the other hand, increasing genetic diversity. A study of sexual inheritance in the first generation progeny revealed the nature of sex determination in T. tabulate. Male sex is heterogametic resulting from the presence of two alternative genetic factors, conditionally M and F, while female is homogametic and determined by a combination of FF sexual factors.