Phylogenetic relationships and differentiation among and within populations of Chaenomeles Lindl. (Rosaceae) estimated with RAPDs and isozymes

RAPD and isozyme analyses based on numerous markers have been used for the first time to investigate patterns of phenetic and genetic differentiation among and within nine wild populations of the genus Chaenomeles represented by the species C. japonica, C. speciosa, C. cathayensis and C. thibetica....

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Bibliographic Details
Published in:Theoretical and applied genetics 2000-09, Vol.101 (4), p.554-563
Main Authors: BARTISH, I. V, GARKAVA, L. P, RUMPUNEN, K, NYBOM, H
Format: Article
Language:English
Subjects:
Bats
Biological and medical sciences
Chaenomeles cathayensis
Chaenomeles japonica
Chaenomeles speciosa
Chaenomeles thibetica
Classical genetics, quantitative genetics, hybrids
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Phylogenetics
Pteridophyta, spermatophyta
Taxonomy
Vegetals
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Summary:RAPD and isozyme analyses based on numerous markers have been used for the first time to investigate patterns of phenetic and genetic differentiation among and within nine wild populations of the genus Chaenomeles represented by the species C. japonica, C. speciosa, C. cathayensis and C. thibetica. Highly significant correlations were found between the two different marker systems for both phenetic distances and gene diversity estimates. In agreement with previous studies on cultivated Chaenomeles material, C. japonica was clearly differentiated from C. speciosa and C. cathayensis. The recently recognised species C. thibetica appeared to be rather closely related to C. cathayensis. Populations of C. japonica and C. speciosa were considerably more diverse than populations of C. cathayensis and C. thibetica. Correspondingly, most of the total variability could be attributed to the within-population differentiation in the case of C. japonica and C. speciosa, and to the between-population differentiation in the case of C. cathayensis. Differences in mating systems among the species can be suggested as a possible explanation of the results. A discordant pattern was found between RAPDs and isozymes in the analyses of population structure within C. japonica. This may be explained by a higher proportion of non-neutral markers for isozymes than for RAPDs. This finding also shows the importance of using multiple molecular marker systems in studies of population structure.[PUBLICATION ABSTRACT]
ISSN:0040-5752
1432-2242
DOI:10.1007/s001220051515