RAPD analysis of interspecific relationships in presumably apomictic Cotoneaster species |
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| Authors: | Igor V Bartish Bertil Hylmö Hilde Nybom |
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| Institution: | 1. Balsg?rd-Department of Horticultural Plant Breeding, Swedish University of Agricultural Sciences, Fj?lkestadsv?gen 123-1, SE-291 94, Kristianstad, Sweden
3. Bygatan 30, SE-267 40, Bjuv, Sweden
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| Abstract: | A few of the approximately 300 Cotoneaster species described are diploid but the majority appear to be polyploid. The occurrence of apomixis inpolyploid Cotoneaster species has been reported but never proven with genetic markers. We have used 76 polymorphic RAPD markers to investigate
the breeding system and phenetic grouping of some critical taxa, including a total of 19 plant accessions representing 13
mostly European species in the series Cotoneaster. Three to four individual plants, raised from seed from the same original plant, were analyzed for each of three accessions
to investigate the possible occurrence of apomictic seed set. Absolutely congruent RAPD profiles were encountered among seedlings
from one accession, whereas we found one or two marker differences among seedlings from the other two accessions. Genetic
similarities among the different accessions were analyzed with a UPGMA-derived dendrogram. The most deviant taxon was the
Chinese C. albokermesinus. A group withC. soczavianus and C. tomentosus was rather isolated from the remainder, as was also C. kullensis. Among the remaining taxa, two well supported clusters were found: (1) C. antoninae and C. uralensis, and (2) C. integerrimus and C. raboutensis, whereas the other five species (C. canescens, C. niger, C. scandinavicus, C. juranus, C. cambricus) formed a poorly supported cluster with no clear substructuring. A principal coordinate analysis yielded results that were
in good correspondence with the dendrogram. Again C. albokermesinus appears to be totally isolated from the other species. In addition, two well-defined and rather isolated groups were found:
(1) C. tomentosus and C. soczavianus, and (2) C. antoninae and C. uralensis, with the remainder comprising a loosely defined group.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | apomixis Cotoneaster DNA marker plant breeding systematics taxonomy |
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