RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Mitochondrial data in monocot phylognetics

Auteur(s) / Author(s)

PETERSEN Gitte ; SEBERG Ole ; DAVIS Jerrold I. ; GOLDMAN Douglas H. ; STEVENSON Dennis W. ; CAMPBELL Lisa M. ; MICHELANGELI Fabian A. ; SPECHT Chelsea D. ; CHASE Mark W. ; FAY Michael F. ; PIRES J. Chris ; FREUDENSTEIN John V. ; HARDY Christopher R. ; SIMMONS Mark P. ;

Résumé / Abstract

Mitochondrial sequences are an important source of data in animal phylogenetics, equivalent in importance to plastid sequences in plants. However, in recent years plant systematists have begun exploring the mitochondrial genome as a source of phylogenetically useful characters. The plant mitochondrial genome is renowned for its variability in size, structure, and gene organization, but this need not be of concern for the application of sequence data in phylogenetics. However, the incorporation of reverse transcribed mitochondrial genes ("processed paralogs") and the recurring transfer of genes from the mitochondrion to the nucleus are evolutionary events that must be taken into account. RNA editing of mitochondrial genes is sometimes considered a problem in phylogenetic reconstruction, but we regard it only as a mechanism that may increase variability at edited sites and change the codon position bias accordingly. Additionally, edited sites may prove a valuable tool in identifying processed paralogs. An overview of genes and sequences used in phylogenetic studies of angiosperms is presented. In the monocots, a large amount of mitochondrial sequence data is being collected together with sequence data from plastid and nuclear genes, thus offering an opportunity to compare data from different genomic compartments. The mitochondrial and plastid data are incongruent when organelle gene trees are reconstructed. Possible reasons for the observed incongruence involve sampling of paralogous sequences and highly divergent substitution rates, potentially leading to long-branch attraction. The above problems are addressed in Acorales, Alismatales, Poales, Liliaceae, the "Anthericum clade" (in Agavaceae), and in some achlorophyllous taxa.

Revue / Journal Title

Aliso    ISSN  0065-6275   CODEN ALSOA7 

Source / Source

2006, vol. 22, pp. 52-62 [11 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Rancho Santa Ana Botanic Garden, Claremont, CA, ETATS-UNIS  (1948) (Revue)

Mots-clés d'auteur / Author Keywords

congruence

;

gene transfer

;

mitochondrial sequences

;

monocotyledons

;

phylogeny

;

processed paralogs

;

Localisation / Location

INIST-CNRS, Cote INIST : 11151, 35400013915336.0040

Nº notice refdoc (ud4) : 18269708



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas