Actin phylogeny identifies Mesostigma viride as a flagellate ancestor of the land plants

被引:68
作者
Bhattacharya, D
Weber, K
An, SS
Berning-Koch, W
机构
[1] Univ Iowa, Dept Biol Sci, Iowa City, IA 52242 USA
[2] Max Planck Inst Biophys Chem, Dept Biochem, D-37077 Gottingen, Germany
关键词
actin; Chlorophyta; green algae; land plants; Mesostigma viride; phylogeny; Prasinophyceae; Streptophyta;
D O I
10.1007/PL00006410
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Green algae and land plants trace their evolutionary history to a unique common ancestor. This ''green lineage'' is phylogenetically subdivided into two distinct assemblages, the Chlorophyta and the Streptophyta. The Chlorophyta includes the Chlorophyceae, Trebouxiophyceae, Ulvophyceae, and Prasinopohyceae, whereas the Streptophyta includes the Charophyceae plus the bryophytes, ferns, and all other multicellular land plants (Embryophyta). The Prasinophyceae is believed to contain the earliest divergeneces within the green lineage. Phylogenetic analyses using rDNA sequences identify the prasinophytes as a paraphyletic taxon that diverges at the base of the Chlorophyta. rDNA analyses, however, provide ambiguous results regarding the identity of the flagellate ancestor of the Streptophyta. We have sequenced the actin-encoding cDNAs from Scherffelia dubia (Prasinophyceae), Coleochaete scutata, Spirogyra sp. (Charophyceae), and the single-copy actin gene from Mesostigma viride (Prasinophyceae). Phylogenetic analyses show Mesostigma to be the earliest divergence within the Streptophyta and provide direct evidence for a scaly, biflagellate, unicellular ancestor for this lineage. This result is supported by the existence of two conserved actin-coding region introns (positions 20-3, 152-1), and one intron in the 5'-untranslated region of the actin gene shared by Mesostigma and the embryophytes.
引用
收藏
页码:544 / 550
页数:7
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