Evolution of green plants and their relationship with other photosynthetic eukaryotes as deduced from 5S ribosomal RNA sequences

Autor: Rupert De Wachter, Raymond De Baere, Yves Van de Peer, Johan Cauwenberghs
Rok vydání: 1990
Předmět:
Zdroj: Plant Systematics and Evolution. 170:85-96
ISSN: 1615-6110
0378-2697
DOI: 10.1007/bf00937851
Popis: The nucleotide sequence of cytoplasmic 5S ribosomal RNAs from three gymnosperms,Pinus contorta, Taxus baccata andJuniperus media and from one fern,Pteridium aquilinum, have been determined. These sequences were aligned with all hitherto known cytoplasmic 5S ribosomal RNA sequences of photosynthetic eukaryotes. A dendrogram based on that set of sequences was constructed by a distance matrix method and the resulting tree compared with established views concerning plant and algal evolution. The following monophyletic groups of photosynthetic eukaryotes are recognizable: theRhodophyta, a group consisting ofPhaeophyta, Bacillariophyta andChrysophyta, and the green plants, the latter comprising green algae,Bryophyta, Pteridophyta andSpermatophyta. According to our 5S ribosomal RNA tree, green plants may have originated from some type of a green flagellated organism such asChlamydomonas. The land plants seem to have originated from some form of charophyte such asNitella. 5S ribosomal RNA seems to be less appropriate to estimate dissimilarities between species which have diverged relatively recently, like the angiosperms. Therefore, a precise evolutionary process is difficult to reconstruct for members of this group.
Databáze: OpenAIRE
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