Origins of domestication and polyploidy in oca (Oxalis tuberosa: Oxalidaceae): nrDNA ITS data

As part of a study aimed at elucidating the origins of the octoploid tuber crop "oca," Oxalis tuberosa, DNA sequences of the internal transcribed spacer of nuclear ribosomal DNA (nrDNA ITS) were determined for oca and several wild Oxalis species, mostly from Bolivia. Phylogenetic analysis...

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Bibliographic Details
Published in:American journal of botany 1998-07, Vol.85 (7), p.975-985
Main Authors: Emshwiller, Eve, Doyle, Jeff J.
Format: Article
Language:English
Subjects:
ADN
Alliances
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
Biological taxonomies
Botany
CHEMOTAXONOMY
CHIMIOTAXONOMIE
CITOTAXONOMIA
crop evolution
Crops
CYTOTAXONOMIE
CYTOTAXONOMY
Deoxyribonucleic acid
DNA
DOMESTICACION
DOMESTICATION
EVOLUCION
EVOLUTION
FILOGENIA
GENETIC RESOURCES
GENETIC VARIATION
GENOMAS
GENOME
GENOMES
INTERNAL TRANSCRIBED SPACER
Internal transcribed spacers
MOLECULAR SEQUENCE DATA
MORPHOTAXONOMY
nrDNA ITS
NUCLEOTIDE SEQUENCE
oca
Oxalidaceae
OXALIS
OXALIS TUBEROSA
PHYLOGENETICS
PHYLOGENIE
PHYLOGENY
PLANT ANATOMY
PLANTAS SILVESTRES
PLANTE SAUVAGE
Plants
Ploidies
POLIPLOIDIA
POLYPLOIDIE
POLYPLOIDY
QUIMIOTAXONOMIA
RECURSOS GENETICOS
RESSOURCE GENETIQUE
Ribosomal DNA
RIBOSOMAS
RIBOSOME
RIBOSOMES
SECUENCIA NUCLEOTIDICA
SEQUENCE NUCLEOTIDIQUE
Systematics
Taxa
TAXONOMIA
TAXONOMIE
TAXONOMY
Tubers
VARIACION GENETICA
VARIATION GENETIQUE
WILD PLANTS
WILD RELATIVES
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Summary:As part of a study aimed at elucidating the origins of the octoploid tuber crop "oca," Oxalis tuberosa, DNA sequences of the internal transcribed spacer of nuclear ribosomal DNA (nrDNA ITS) were determined for oca and several wild Oxalis species, mostly from Bolivia. Phylogenetic analysis of these data supports a group of these species as being close relatives of oca, in agreement with morphology and cytology, but at odds with traditional infrageneric taxonomy. Variation in ITS sequences within this group is quite low (0-7 substitutions in the entire ITS region), contrasting with the highly divergent (unalignable in some cases) sequences within the genus overall. Some groups of morphologically differentiated species were found to have identical sequences, notably a group that includes oca, wild populations of Oxalis that bear small tubers, and several other clearly distinct species. The presence of a second, minor sequence type in at least some oca accessions suggests a possible contribution from a second genome donor, also from within this same species group. ITS data lack sufficient variation to elucidate the origins of oca precisely, but have identified a pool of candidate species and so can be used as a tool to screen yet unsampled species for possible progenitors
ISSN:0002-9122
1537-2197
DOI:10.2307/2446364