ISHS Acta Horticulturae 690: I International Rose Hip Conference
DOGROSES IN THE WILD: AMOUNT AND DISTRIBUTION OF GENETIC VARIABILITY |
| Authors: | H. Nybom, G. Werlemark |
| Keywords: | Caninae, image analysis, morphometry, population genetics, RAPD, Rosa, rose-hip |
| Abstract:
We analysed inter- and intraspecific genetic variation based on large seed collections from dogroses (Rosa section Caninae) in the Scandinavian countries. Manually-measured and image analysis-derived morphological characters as well as DNA markers have been applied. Overall, most variation occurred between taxa, but with considerable differentiation between populations within taxa. The dogrose taxa analysed differed in the amount and partitioning of intraspecific genetic variation; Rosa caesia and R. dumalis appear to be the most variable of the species we analysed, and R. rubiginosa the least. Differences in reproductive system (relative proportions of apomixis, selfing, outcrossing and interspecific hybridization), as well as historical events may explain the different amounts of genetic variability in the different species. A pronounced discrepancy was found in interspecific genetic distances estimated by quantitative morphological characters and by DNA markers, respectively. The former suggested a weak differentiation among the commonly recognized dogrose taxa but no division into separate subsections. In contrast, DNA markers (RAPD) suggest that the three subsections (Caninae, Rubigineae and Vestitae) differ substantially but that no taxa can be identified within these subsections. | |
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