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A DNA barcode for land plants
DNA barcoding involves sequencing a standard region of DNA as a tool for species identification. However, there has been no agreement on which region(s) should be used for barcoding land plants. ToExpand
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Sympatric speciation in palms on an oceanic island
The origin of species diversity has challenged biologists for over two centuries. Allopatric speciation, the divergence of species resulting from geographical isolation, is well documented. However,Expand
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Phylogenetic relationships in Nicotiana (Solanaceae) inferred from multiple plastid DNA regions.
For Nicotiana, with 75 naturally occurring species (40 diploids and 35 allopolyploids), we produced 4656bp of plastid DNA sequence for 87 accessions and various outgroups. The loci sequenced wereExpand
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The ups and downs of genome size evolution in polyploid species of Nicotiana (Solanaceae).
BACKGROUND In studies looking at individual polyploid species, the most common patterns of genomic change are that either genome size in the polyploid is additive (i.e. the sum of parental genomeExpand
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Molecular systematics, GISH and the origin of hybrid taxa in Nicotiana (Solanaceae).
Phylogenetic relationships in the genus Nicotiana were investigated using parsimony analyses of the internal transcribed spacer (ITS) regions of nuclear ribosomal DNA (nrDNA). In addition, origins ofExpand
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Nomenclatural changes and a new sectional classification in Nicotiana (Solanaceae)
Recent studies using regions of the nuclear and plastid genomes have shown that T. H. Goodspeed's sectional groupings in Nicotiana are for the large part upheld. However, we have shown that inExpand
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Long-term genome diploidization in allopolyploid Nicotiana section Repandae (Solanaceae).
Here, we analyze long-term evolution in Nicotiana allopolyploid section Repandae (the closest living diploids are N. sylvestris, the maternal parent, and N. obtusifolia, the paternal parent). WeExpand
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Sequence of events leading to near-complete genome turnover in allopolyploid Nicotiana within five million years.
Analyses of selected bacterial artificial chromosomes (BACs) clones suggest that the retrotransposon component of angiosperm genomes can be amplified or deleted, leading to genome turnover. Here,Expand
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Evolution of rDNA in Nicotiana allopolyploids: a potential link between rDNA homogenization and epigenetics.
BACKGROUND The evolution and biology of rDNA have interested biologists for many years, in part, because of two intriguing processes: (1) nucleolar dominance and (2) sequence homogenization. WeExpand
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Nuclear glutamine synthetase evolution in Nicotiana: phylogenetics and the origins of allotetraploid and homoploid (diploid) hybrids.
Interspecies relationships in Nicotiana (Solanaceae) are complex because 40 species are diploid (two sets of chromosomes) and 35 species are allotetraploid (four sets of chromosomes, two from eachExpand
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