Author:
Conran John G.,Wood Glenys M.,Martin Peter G.,Dowd Julie M.,Quinn Christopher J.,Gadek Paul A.,Price Robert A.
Abstract
Analysis of sequences of the chloroplast gene rbcL for
76 taxa of Podocarpaceae (representing all genera except
Parasitaxus) and five species of Phyllocladaceae were
undertaken with respect to their relationships to each other and to 28
coniferalean outgroup taxa from seven families. The results indicate that
Podocarpaceae are polyphyletic unless expanded to include Phyllocladaceae.
Within Podocarpaceae, Sundacarpus is placed in a clade
with Prumnopitys, and
Falcatifolium is paraphyletic as a basal grade to
Dacrydium. Phyllocladus is in an
unresloved clade with Halocarpus,
Manoao/Lagarostrobos and
Prumnopitys/Sundacarpus. The separation of
Afrocarpus from Podocarpus and its
placement instead as sister to Nageia and
Retrophyllum is supported.
Podocarpus s. str. is monophyletic, with both subgenera
identified, albeit poorly supported. The analysis placed
Lepidothamnus and Saxegothaea in
an unresolved basal polytomy within the family. There were no clear outgroup
relationships with the family. These results differ from the morphological
clades found by Kelch (1997), and disagree strongly with his
18S-sequence-based phylogeny (Kelch 1998). However, jackknife support values
indicate that although the genera are well supported, relationships both
within and between them are not, suggesting that intergeneric relationships in
the family require further study. There is also some congruence between our
results and those of the gymnosperm 18S study by Chaw
et al. (1997), although their study included only three
Podocarpaceae and one Phyllocladaceae species.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
64 articles.
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