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6 results for “Chloroplast microsatellites”
Microsatellite data, chloroplast and nuclear rRNA sequences of Avicennia marina from Vietnam, Malaysia, and The Philippines
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A Pleistocene legacy of gene pools, ecodemes and admixtures of Stuckenia pectinata (L.) Börner as evidenced from microsatellites, complete chloroplast genomes and ribosomal RNA cistron (Europe, Africa)
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Data from: Combining chloroplast and nuclear microsatellites to investigate origin and dispersal of New World sweet potato landraces
We analyzed a representative collection of New World sweet potato landraces (329 accessions from Mexico to Peru) with both chloroplast and nuclear microsatellite markers. Both kinds of markers supported the existence of two geographically restricted genepools, corresponding to accessions from the north-western part of South America and accessions from the Caribbean and Central America super-region. Our conservative cpSSRs markers revealed that the divergence between the two haplotype groups is associated with numerous mutation events concerning various markers, supporting the idea that this divergence may be ancient, predating domestication. For both kind of markers, we found no significant difference in diversity between the two genepools and detected region-specific alleles in both groups. Previous studies have favoured the hypothesis of a single domestication of this crop. Our analysis suggests at least two independent domestications, in Meso-America and in the north-western part of South America. Sweet potato was then dispersed from these centres throughout tropical America. Comparison of nuclear and chloroplast data suggests that exchanges of clones and sexual reproduction were both important processes in landrace diversification in this clonally propagated crop. Our analysis provides useful tools for rationalizing the conservation and use of germplasm collections.
Drakaea glyptodon nuclear microsatellite and chloroplast haplotype data
<p class="CxSpFirst">Many orchids are characterized by small, patchily distributed populations. Resolving how they persist is important for understanding the ecology of this hyper-diverse family, many members of which are of conservation concern. <span>Ten</span> populations of the common terrestrial orchid <i>Drakaea glyptodon</i> from Southwest Australia were genotyped with ten nuclear and five chloroplast SSR markers. Levels and partitioning of genetic variation, and effective population sizes (<i>N</i><sub>e</sub>), were estimated. Spatial genetic structure of nuclear diversity, together with chloroplast data, are used to infer the effective number of seed parents per population. We found high genetic diversity, <i>N</i><sub>e</sub> values that generally exceed predictions based on the number of flowering individuals, and moderate levels of gene flow. Two populations were founded by < 5 colonists suggesting some populations are colonized by few seeds, with growth largely resulting from <i>in situ</i> recruitment. A value of 3.65 for <i>m</i><sub>p </sub>/<i>m</i><sub>s</sub> indicates that pollinators play a greater role than seed in introducing genetic diversity to populations via gene flow. Our results highlight that <i>D. glyptodon</i> is highly effective at persisting in patchily distributed populations. However, it is important to examine how insights from this common, widespread species transfer to species that are rare and/or occur in fragmented landscapes.</p>
Data from: Combining chloroplast and nuclear microsatellites to investigate origin and dispersal of New World sweet potato landraces
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Drakaea glyptodon nuclear microsatellite and chloroplast haplotype data
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