Chlamydomonas neoplanoconvexa nom. nov. and its unique phylogenetic position within Volvocales (Chlorophyceae)

Takashi Nakada, Masaru Tomita

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Chlamydomonas Ehrenb. is a unicellular volvocalean genus consisting of 400-600 species, most of which are known solely based on microscopy. In this study, a newly isolated strain of Chlamydomonas neoplanoconvexa (M. O. P. Iyengar) Nakada nom. nov. (≡Chlamydomonas planoconvexa M. O. P. Iyengar non J. W. G. Lund) was examined using light microscopy and combined 18S rRNA, rbcL and psaB gene phylogeny. The C. neoplanoconvexa strain was quite similar to Chlamydomonas perpusilla (Korshikov) Gerloff in terms of its small fusiform vegetative cells (∼10μm in length), parietal chloroplast containing a single pyrenoid, and nucleus posterior to the pyrenoid. However, C. neoplanoconvexa was distinguished from C. perpusilla based on the morphology of the papillae and pyrenoids. The two species belong to the clade Caudivolvoxa in the order Volvocales, but are distantly related to each other. Chlamydomonas perpusilla was shown to be sister to Chlorogonium Ehrenb. (clade Chlorogonia, within Caudivolvoxa), while C. neoplanoconvexa represented a second basal lineage within Caudivolvoxa, next to the clade Characiosiphonia. Although the morphology of C. neoplanoconvexa was not particularly outstanding, its unique phylogenetic position will encourage further investigation of this species and its uncultivated relatives.

本文言語English
ページ(範囲)194-199
ページ数6
ジャーナルPhycological Research
59
3
DOI
出版ステータスPublished - 2011 7

ASJC Scopus subject areas

  • 水圏科学
  • 農業および生物科学(その他)
  • 植物科学

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