Jun 10, 2004

Distribution of introns in the mitochondrial gene nad1 in land plants: phylogenetic and molecular evolutionary implications

Molecular Phylogenetics and Evolution
Olena Dombrovska, Yin-Long Qiu

Abstract

Forty-six species of diverse land plants were investigated by sequencing for their intron content in the mitochondrial gene nad1. A total of seven introns, all belonging to group II, were found, and two were newly discovered in this study. All 13 liverworts examined contain no intron, the same condition as in green algae. Mosses and hornworts, however, share one intron by themselves and another one with vascular plants. These intron distribution patterns are consistent with the hypothesis that liverworts represent the basal-most land plants and that the two introns were gained in the common ancestor of mosses-hornworts-vascular plants after liverworts had diverged. Hornworts also possess a unique intron of their own. A fourth intron was found only in Equisetum L., Marattiaceae, Ophioglossum L., Osmunda L., Asplenium L., and Adiantum L., and was likely acquired in their common ancestor, which supports the monophyly of moniliformopses. Three introns that were previously characterized in angiosperms and a few pteridophytes are now all extended to lycopods, and were likely gained in the common ancestor of vascular plants. Phylogenetic analyses of the intron sequences recovered topologies mirroring those of the plants, suggesting th...Continue Reading

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References

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Citations

Mentioned in this Paper

Mosses
Equisetum arvense
Genes, Plant
Anemone americana
RNA Conformation
MT-ND2 gene
Heuristics
Huperzia lucidula
Mohr Syndrome
Exons

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