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Algae > Volume 16(4); 2001 > Article
Algae 2001;16(4): 363-367.
A Comparative Study of Morphological Characters and Sequences of rbcL Gene in Staurastrum of Desmid
Mira Nam, Ok-Min Lee
Department of Biology, Kyonggi University
The genus Staurastrum Meyen includes more recoreded species and subspecific taxa than any of the desmids except Cosmarium. Because of the great morphological variations exhibited by radiate semicells, workers proposed subdivisions of Staurastrum to form either separate genera, or subgenera. This genus has been assigned to two divisions, with sections in each, based on the elongated processes at angles of semicells, the morphology of semicell, the sculpture of cell wall and the shape of sinus. Sequence data for the large subnuit of RUBISCO(rbcL) were employed to compare with taxa of two divisions, with sections in each, for evaluating the taxonomic stability of these morphological characters. Parsimony analysis of the rbcL data, with all positions and changes weighted equally, was consistant with two divisions of this genus, but not with sections. Therefore, it is believed that the feature of the elongated processes at angles of semicells was a character reflecting the phylogenetic relationships in genus Staurastrum. The morphology of semicell, the sculpture of cell wall and the shape of sinus, which devided each division to sections, are not appropriate characters to be used in section system.
Key words: desmid, phylogeny, rbcL, Staurastrum

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A Comparative Study of the Morphological Characters and Sequence Data of rbcL Gene in Cosmarium Species   2001 ;16(4)
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