The origin of red algae: Implications for plastid evolution
AUTOR(ES)
Stiller, John W.
FONTE
The National Academy of Sciences of the USA
RESUMO
The origin of the red algae has remained an enigma. Historically the Rhodophyta were classified first as plants and later as the most ancient eukaryotic organisms. Recent molecular studies have indicated similarities between red and green plastids, which suggest that there was a single endosymbiotic origin for these organelles in a common ancestor of the rhodophytes and green plants. Previous efforts to confirm or reject this effort by analyses of nuclear DNA have been inconclusive; thus, additional molecular markers are needed to establish the relationship between the host cell lineages, independent of the evolutionary history of their plastids. To furnish such a data set we have sequenced the largest subunit of RNA polymerase II from two red algae, a green alga and a relatively derived amoeboid protist. Phylogenetic analyses provide strong statistical support for an early evolutionary emergence of the Rhodophyta that preceded the origin of the line that led to plants, animals, and fungi. These data, which are congruent with results from extensive analyses of nuclear rDNA, argue for a reexamination of current models of plastid evolution.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=20755Documentos Relacionados
- A gene phylogeny of the red algae (Rhodophyta) based on plastid rbcL.
- Phycobilisomes from Blue-Green and Red Algae: Isolation Criteria and Dissociation Characteristics 1
- Evolution of the vacuolar H+-ATPase: implications for the origin of eukaryotes.
- Gas Exchange of Algae: IV. Reliability of Chlorella pyrenoidosa
- Sequence and secondary structure of Porphyra umbilicalis 5S rRNA. Relevance for the evolutionary origin of red algae.