Abstract

Proper evaluation of genetic resources in native material is especially important for plant species at the initial stages of domestication. Some recent results obtained using DNA markers are reviewed here for seven temperate crops in the Northern hemisphere: black chokeberry (Aronia sp.), dogroses (Rosa sp.), Japanese quince (Chaenomeles sp.), lingonberry (Vaccinium vitis-idaea), pawpaw (Asimina triloba), saskatoon (Amelanchier) and sea buckthorn (Hippophae). Random amplified polymorphic DNA (RAPD)-based estimations of diversity within wild-growing populations have previously been demonstrated to show strong associations with life history traits. Comparatively high levels of within-population diversity were recorded for pawpaw and lingonberry, and intermediate levels for Japanese quince and the diploid populations of black chokeberry. Sea buckthorn and the tetraploid populations of black chokeberry instead showed low levels of polymorphism, presumably due to the early successional status of the former species and to facultative apomixis in the latter species. The lowest between-population differentiation was found in three outcrossing species: lingonberry, Japanese quince and sea buckthorn. Considerably higher values were noted for presumably self-fertile pawpaw and for the two dogrose species, which have seriously restricted genetic recombination due to the aberrant canina meiosis. Finally, very high population differentiation was encountered among the tetraploid black chokeberry populations, which probably can be explained by their apomictic reproduction. Cultivar discrimination using RAPD analysis was quite efficient in most of the investigated crops, as expected for mainly outcrossing species with vegetatively propagated cultivars. The only exceptions were black chokeberry, where the four analysed cultivars appear to consist of the same, apomictically reproducing genotype, and two pairs of parent-offspring derived saskatoon cultivars, which have presumably been derived through selfing or apomixis

Published in

Acta Horticulturae
2003, number: No.622, pages: 81-94
ISBN: 90-6605-189-2
Publisher: International Society for Horticultural Science (ISHS)

SLU Authors

• Nybom, Hilde

  • Department of Crop Science, Swedish University of Agricultural Sciences
    

• Gustavsson, Larisa

  • Department of Crop Science, Swedish University of Agricultural Sciences
    

• Persson Hovmalm, Helena

  • Department of Crop Science, Swedish University of Agricultural Sciences
    

• Werlemark, Gun

  • Department of Crop Science, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Horticulture


Permanent link to this page (URI)

https://res.slu.se/id/publ/179