INVESTIGADORES
SANCHEZ PUERTA Maria virginia
artículos
Título:
Sorting wheat from chaff in multi-gene analyses of chlorophyll c-containing plastids
Autor/es:
SÁNCHEZ PUERTA, M. V., T.R. BACHVAROFF & C.F. DELWICHE
Revista:
MOLECULAR PHYLOGENETICS AND EVOLUTION
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Año: 2007 vol. 44 p. 885 - 897
ISSN:
1055-7903
Resumen:
Photosynthetic eukaryotes
contain primary, secondary or tertiary plastids, depending on the source of the
organelle (a cyanobacterium or a photosynthetic eukaryote). Plastid phylogeny
is relatively well investigated, but molecular phylogenies have conflicted as a
function of gene choice, taxon-representations, and analytical method. To
better understand the influences of these variables, we performed analyses of a
multi-gene data set based on 62 plastid-associated genes of 15 taxa
representing the major plastid lineages. In an attempt to distinguish
phylogenetic signal from non-phylogenetic patterns, we analyzed the data using
a wide range of phylogenetic methods and examined the effect of covarion
evolution and compositional bias. The data suggest that the chlorophyll
c-containing plastids are monophyletic and acquired their plastids from the red
algae after the emergence of the Cyanidiales. The relationships among chl
c-containing plastids are particularly hard to resolve. This is the largest
data set used for this purpose; the analyses show that cryptophyte plastids are
sister to other chl c-containing plastids, and haptophyte and
peridinin-containing dinoflagellate plastids are closely related.