Coding and noncoding plastid DNA in palm systematics

Plastid DNA sequences evolve slowly in palms but show that the family is monophyletic and highly divergent relative to other major monocot clades. It is therefore difficult to place the root within the palms because faster evolving, length-variable sequences cannot be aligned with outgroup monocots,...

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Bibliographic Details
Published in:American journal of botany 2001-06, Vol.88 (6), p.1103-1117
Main Authors: Asmussen, Conny B., Chase, Mark W.
Format: Article
Language:English
Subjects:
Arecaceae
Botanical gardens
Botany
Classification
coding and noncoding plastid DNA
Datasets
Deoxyribonucleic acid
DNA
Evolution
Genes
Introns
Molecular biology
molecular systematics
Palmae
Parsimony
Phylogenetics
Phylogeny
Plastids
rbcL
rbcL gene
rps16 intron
Systematics
Trees
trnL‐trnF
We they distinction
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Description
Summary:Plastid DNA sequences evolve slowly in palms but show that the family is monophyletic and highly divergent relative to other major monocot clades. It is therefore difficult to place the root within the palms because faster evolving, length-variable sequences cannot be aligned with outgroup monocots, and length-conserved regions have been thought to give too few characters to resolve basal nodes. To solve this problem, we combined 94 ingroup and 24 outgroup sequences from the length-conserved rbcL gene with ingroup and alignable outgroup sequences from noncoding rps16 intron and trnL-trnF regions. The separate rps16 intron and trnL-trnF region contained about the same number of variable sites (autapomorphies not included) as rbcL, but gave higher retention indices and more clades with bootstrap support. In general, the strict consensus tree based on combined rbcL, rps16 intron, and trnL-trnF data showed more resolution towards the base of the palm family than previous hypotheses of relationships of the Arecaceae. An important result was the position of subfamily Calamoideae as sister to the rest of the palms, but this received
ISSN:0002-9122
1537-2197
DOI:10.2307/2657094