Molecular phylogeny of the green algal order prasiolales (Trebouxiophyceae, Chlorophyta)

被引:56
作者
Rindi, Fabio
McIvor, Lynne
Sherwood, Alison R.
Friedl, Thomas
Guiry, Michael D.
Sheath, Robert G.
机构
[1] Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA
[2] Univ Leiden Branch, Natl Herbarium Nederland, NL-2300 RA Leiden, Netherlands
[3] Univ Hawaii, Dept Bot, Honolulu, HI 96822 USA
[4] Univ Gottingen, Albrecht Von Haller Inst Pflanzenwissensch, Abt Expt Phykol & Sammlung Algenkulturen, D-37073 Gottingen, Germany
[5] Natl Univ Ireland Univ Coll Galway, Martin Ryan Inst, Galway, Ireland
[6] Calif State Univ San Marcos, Dept Biol Sci, San Marino, CA 92096 USA
关键词
Chlorophyta; phylogeny; Prasiococcus; Prasiola; Prasiolales; Prasiolopsis; rbcL gene; Rosenvingiella; Trichophilus;
D O I
10.1111/j.1529-8817.2007.00372.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The systematics of the Prasiolales was investigated by phylogenetic inference based on analyses of the rbcL and 18S rRNA genes for representatives of all four genera currently attributed to this order (Prasiococcus, Prasiola, Prasiolopsis, Rosenvingiella), including all type species. The rbcL gene had higher sequence divergence than the 18S rRNA gene and was more useful for phylogenetic inference at the ranks of genus and species. In the rbcL gene phylogeny, three main clades were observed, corresponding to Prasiola, Prasiolopsis, and Rosenvingiella. Prasiococcus was nested among species of Prasiola occurring in subaerial and supralittoral habitats. Trichophilus welckeri Weber Bosse, a subaerial alga occurring in the fur of sloths in Amazonia, was closely related to Prasiolopsis ramosa Vischer. The species of Prasiola were grouped into three well-supported clades comprising (i) marine species, (ii) freshwater and terrestrial species with linear blades, and (iii) terrestrial species with rounded or fan-shaped blades. Sequence divergence was unexpectedly low in the marine group, which included species with different morphologies. For the 18S rRNA gene, the phylogenetic analyses produced several clades observed for the rbcL gene sequence analysis, but, due to very little sequence variation, it showed considerably lower resolution for inference at the species and genus levels. Due to the low support of some internal branches, the results of the analyses did not allow an unambiguous clarification of the origin and the early evolution of the Prasiolales.
引用
收藏
页码:811 / 822
页数:12
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