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- W2021574148 abstract "Intraspecific chloroplast DNA polymorphisms were examined for 51 populations of seven species in the genus Krigia. A total of 1,100 restriction sites was surveyed and 46 of these were variable at the intraspecific level. Twenty-two of the variable sites were found within K virginica, giving this species one of the highest levels of intraspecific chloroplast DNA divergence of any examined species. In contrast, no restriction site variation was detected within K dandelion, K wrightii, and K occidentalis. Five polymorphisms were identified from the 16 populations of the K cespitosa-gracilis complex, but no mutations distinguished the K cespitosa and K gracilis types. Krigia montana and K biflora showed 11 and eight restriction site polymorphisms, respectively. The chloroplast genome of the hexaploid K montana was derived from the diploid K biflora rather than the tetraploid K montana. High levels of polymorphism were found in species having different ploidy levels, such as K virginica, K biflora, and K montana. Furthermore, most mutations found in these three species were recorded from the tetraploid lineages. As a result, evolutionary rates between different ploidy levels differ significantly. The chloroplast DNA restriction site data suggest that all surveyed populations of the autotetraploid K virginica originated from a common ancestor. Our results also indicate that certain regions of the chloroplast genome have changed more rapidly than others and have the potential to resolve evolutionary questions at the population level." @default.
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- W2021574148 date "1992-06-01" @default.
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- W2021574148 title "EVOLUTIONARY IMPLICATIONS OF INTRASPECIFIC CHLOROPLAST DNA VARIATION IN DWARF DANDELIONS (KRIGIA; ASTERACEAE)" @default.
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- W2021574148 doi "https://doi.org/10.1002/j.1537-2197.1992.tb14612.x" @default.
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