INVESTIGADORES
SANCHEZ PUERTA Maria virginia
artículos
Título:
Chlorophyll c containing plastid relationships based on analyses of a multi-gene dataset with all four chromalveolates lineages
Autor/es:
BACHVAROFF, T.R., M.V. SÁNCHEZ PUERTA & C.F. DELWICHE
Revista:
MOLECULAR BIOLOGY AND EVOLUTION
Editorial:
OXFORD UNIV PRESS
Referencias:
Año: 2005 vol. 22 p. 1 - 11
ISSN:
0737-4038
Resumen:
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The
chlorophyll c containing algae comprise four major lineages: dinoflagellates,
haptophytes, heterokonts and cryptophytes. These four lineages have sometimes
been grouped together based on their pigmentation, but cytological and rRNA
data had suggested they were not a monophyletic lineage. Some molecular data
support monophyly of the plastids while other plastid and host data suggest
different relationships. It is uncontroversial that these groups have all
acquired plastids from another eukaryote, probably from the red algal lineage,
in a secondary endosymbiotic event, but the number and sequence of such
event(s) remains controversial. Understanding chlorophyll c containing plastid
relationships is a first step towards determining the number of endosymbiotic
events within the chromalveolates. We report here phylogenetic analyses using
ten plastid genes with representatives of all four chromalveolate lineages.
This is the first organellar genome scale analysis to include both haptophytes
and dinoflagellates. Concatenated analyses support the monophyly of the
chlorophyll c containing plastids and suggest that cryptophyte plastids are the
basal member of the chlorophyll c containing plastid lineage. The gene psbA,
which has at times been used for phylogenetic purposes, was found to differ
from the other genes in its placement of the dinoflagellates and the
haptophytes, and in its lack of support for monophyly of the green and red
plastid lineages. Overall, the concatenated data are consistent with a single
origin of chlorophyll c containing plastids from red algae. However, these data
cannot test several key hypothesis concerning chromalveolate host monophyly,
and do not preclude the possibility of serial transfer of chlorophyll c
containing plastids among distantly related hosts.
