PHYLOGENY OF <i>CHLAMYDOMONAS</i> (CHLOROPHYTA) BASED ON CLADISTIC ANALYSIS OF NUCLEAR 18S rRNA SEQUENCE DATA<sup>1</sup>
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<jats:title>ABSTRACT</jats:title><jats:p>The genus <jats:italic>Chlamydomonas</jats:italic> Ehrenberg may contain as many as 450 described species. Morphological, physiological and molecular data show that variation among some <jats:italic>Chlamydomonas</jats:italic> species can he great, leading to speculation that multiple, generic‐level lineages exist within this genus. The most recent systematic studies of <jats:italic>Chlamydomonas</jats:italic> have led to proposals of nine distinct morphological and 15 distinct sporangial autolysin groups. Partial sequences from the nuclear small subunit rRNAs from 14 <jats:italic>Chlamydomonas</jats:italic> species representing 12 autolysin and four morphological groups, and from three flagellates thought to he related to <jats:italic>Chlamydomonas</jats:italic> were determined in a phylogenetic study of relationships among these algae. Sequence comparisons among some <jats:italic>Chlamydomonas</jats:italic> species revealed differences comparable to the sequence divergence between soybeans and cycads. Cladistic analysis of the sequence data suggests that multiple lineages exist among species of <jats:italic>Chlamydomonas.</jats:italic> Some of these lineages represent alliances of both <jats:italic>Chlamydomonas</jats:italic> and non<jats:italic>‐Chlamydomonas</jats:italic> taxa; thus, the current taxonomy does not reflect natural, or monophyletic, groups. Collectively, these lineages may represent distinct families or even orders.</jats:p>
収録刊行物
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- Journal of Phycology
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Journal of Phycology 26 (4), 689-699, 1990-12
Wiley
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詳細情報 詳細情報について
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- CRID
- 1363670320316913152
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- NII論文ID
- 30014852417
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- ISSN
- 15298817
- 00223646
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- データソース種別
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