RRC ID 19925
Author Lemieux C, Otis C, Turmel M.
Title Ancestral chloroplast genome in Mesostigma viride reveals an early branch of green plant evolution.
Journal Nature
Abstract Sequence comparisons suggest that all living green plants belong to one of two major phyla: Streptophyta (land plants and their closest green algal relatives, the charophytes); and Chlorophyta (the rest of green algae). Because no green algae are known that pre-date the Streptophyta/Chlorophyta split, and also because the earliest diverging green algae show considerable morphological variation, the nature of the unicellular flagellate ancestor of the two green plant phyla is unknown. Here we report that the flagellate Mesostigma viride belongs to the earliest diverging green plant lineage discovered to date. We have sequenced the entire chloroplast DNA (118,360 base pairs) of this green alga and have conducted phylogenetic analyses of sequences derived from this genome. Mesostigma represents a lineage that emerged before the divergence of the Streptophyta and Chlorophyta, a position that is supported by several features of its chloroplast DNA. The structure and gene organization of this genome indicate that chloroplast DNA architecture has been extremely well conserved in the line leading to land plants.
Volume 403(6770)
Pages 649-52
Published 2000-2-10
DOI 10.1038/35001059
PMID 10688199
MeSH Chlorophyta / classification Chlorophyta / genetics* Chloroplasts / genetics* DNA Evolution, Molecular* Flagella Genome Molecular Sequence Data Phylogeny Plants / classification Plants / genetics
IF 42.779
Times Cited 189
Algae NIES-296