Sexual reproduction in Schizostauron (Bacillariophyta) and a preliminary phylogeny of the genus

Nickolai A. Davidovich , Olga I. Davidovich , Andrzej Witkowski , Chunlian Li , Przemysław Dąbek , David G. Mann , Izabela Zgłobicka , Krzysztof Kurzydłowski , Evgeniy Gusev , Ewa Górecka , M. Krzywda


The focus of this paper is the sexual reproduction and phylogeny of Schizostauron Grunow, which were studied using clonal cultures isolated from the Indian Ocean coast of Mozambique near Tofo and Bazaruto. Taxa of Schizostauron were characterized by light and electron microscopy and a phylogeny derived from three genes (rbcL, psbC and short subunit). Schizostauron was established in the second half of the 19th century, then forgotten, with its taxa included in Cocconeis or Achnanthes sensu lato. Schizostauron, together with Astartiella and perhaps also Kolbesia and Karayevia, seems to form a third lineage of monoraphid diatoms, which are related to biraphid diatoms belonging to the Stauroneidaceae and Parlibellus, but not to the two other lineages of monoraphids (Achnanthes and the Achnanthidiaceae–Cocconeidaceae group). In culture, size reduction was followed by release of gametes and auxosporulation in mixtures of clones. Despite some morphological differences, four clones from the Bazaruto population proved to be sexually compatible, one of the clones being sexually compatible with the three others. Before gametogenesis, cells gathered in groups of two to eight through active movement. Some groups of cells surrounded themselves by weakly visible mucilage. Reproduction was isogamous morphologically, and apparently also behaviourally. Growing auxospores were surrounded by the empty irregularly arranged frustules of parental cells. In numerous aspects the pattern of sexual reproduction of Schizostauron is similar to that of Achnanthes sensu stricto. The rbcL identity matrix (IDM) for sexually compatible clones ranged between 0.998 and 0.984. One clone derived from the Tofo population had an IDM below 0.900 and was sexually isolated from the remaining clones. A description of Schizostauron davidovichiorum sp. nov. is provided.
Author Nickolai A. Davidovich - Karadag Scientific Station – Nature Reserve, Russian Academy of Sciences, Nauki 24, Kurortnoe, Feodosiya 298188, Russia
Nickolai A. Davidovich,,
, Olga I. Davidovich - Karadag Scientific Station – Nature Reserve, Russian Academy of Sciences, Nauki 24, Kurortnoe, Feodosiya 298188, Russia
Olga I. Davidovich,,
, Andrzej Witkowski - Szczecin University (USz)
Andrzej Witkowski,,
, Chunlian Li
Chunlian Li,,
, Przemysław Dąbek
Przemysław Dąbek,,
, David G. Mann - 3Royal Botanic Garden Edinburgh, Edinburgh, Scotland, UK
David G. Mann,,
, Izabela Zgłobicka ZPM
Izabela Zgłobicka,,
- Division of Materials Design
, Krzysztof Kurzydłowski ZPM
Krzysztof Kurzydłowski,,
- Division of Materials Design
, Evgeniy Gusev
Evgeniy Gusev,,
, Ewa Górecka
Ewa Górecka,,
et al.`
Journal seriesPhycologia, ISSN 0031-8884
Issue year2016
Publication size in sheets0.8
Keywords in PolishAuxosporulation, gametogena, Okrzemki monorafowe, Filogeneza, Schizostauron, Seksualna reprodukcja
Keywords in EnglishAuxosporulation, Gametogenesis, Monoraphid diatoms, Phylogeny, Schizostauron, Sexual reproduction
Languageen angielski
Davidovich et al 2016 Phycologia.pdf 3.74 MB
Score (nominal)30
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.826 (2) - 2016=1.976 (5)
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