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Botanica Marina

Editor-in-Chief: Dring, Matthew

6 Issues per year


IMPACT FACTOR 2015: 1.250

SCImago Journal Rank (SJR) 2015: 0.608
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ISSN
1437-4323
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Volume 47, Issue 1 (Feb 2004)

Issues

Sexual behaviour, auxosporulation and chloroplast dynamics in a marine Amphora (Bacillariophyceae) studied in culture

Koen Sabbe / Victor A. Chepurnov / David G. Mann / Wim Vyverman
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BOT.2004.006

Abstract

Chloroplast, mating behaviour, and auxosporulation are described for Amphora cf. proteus Gregory. The interphase chloroplast is butterfly-shaped and lies with its central part, containing a flat discoid pyrenoid, pressed against the ventral side of the girdle. Chloroplast division is longitudinal and begins and ends before mitosis and cytokinesis. Over the cell cycle, no rotations or lateral translocations of the chloroplast were noticed. A. cf. proteus is the first species of this genus in which sexual reproduction and breeding behaviour have been studied in clonal cultures. The cells isolated exhibited strictly dioecious behaviour, reproducing only in mixed cultures of sexually compatible clones. Sexual reproduction in A. cf. proteus is morphologically and behaviourally isogamous. Each gametangium forms two functional gametes, which do not rearrange within the gametangium, and two small aborted cells. The aborted cells are produced after an unequal cytokinesis accompanying meiosis II; the second cytokinesis during gametogenesis represents a phenomenon hitherto unknown in pennate diatoms. Auxospore development takes place by bipolar expansion. The expansion is unequal on the two long sides of the auxospore, so that the auxospore becomes curved and dorsiventral. The auxospore forms a transverse and longitudinal perizonium.

About the article

Published Online: 2005-06-01

Published in Print: 2004-02-26


Citation Information: Botanica Marina, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/BOT.2004.006. Export Citation

Citing Articles

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[1]
Anna H. Wachnicka and Evelyn E. Gaiser
Diatom Research, 2007, Volume 22, Number 2, Page 387
[2]
Rui Li, Yu Liu, Guizhu Chen, Nora F.Y. Tam, Paul K.S. Shin, Sin Gin Cheung, and Tiangang Luan
Botanica Marina, 2008, Volume 51, Number 5
[3]
David G. Mann and Aloisie PoulÍčková
Phycologia, 2010, Volume 49, Number 2, Page 183

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