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Genetic variation and population structure of three Trifolium species

100%

Bulinska-Radomska Z.

Journal of Applied Genetics

1996

tom 37

nr 2

Three diploid Trifolium (Fabaceae) species, T. campestre, T.fragiferum and T. montanum, were electrophoretically assayed to elucidate the range and organization of genetic variation in relation to the mating system, reproduction mode and longevity of the species. T. campestre is an annual self-pollinated species. T.fragiferum and T. montanum are cross-pollinated perennials. The former species reproduces both sexually and vegetatively, whereas the latter relies solely on sexual reproduction. Several populations of each species collected throughout Poland were surveyed for 15 enzymes. The measures of variation included: proportion of polymorphic loci per population, average number of alleles per locus, average gene diversity (He) and genetic distance (D). To describe the organization of diversity in each species, total genetic variation per locus (Ht) was calculated and partitioned into intra-(Hs) and inter-(Dst) populational components. Both cross-pollinated species had more polymorphic loci, higher numbers of alleles per locus and higher level of diversity than self-pollinated T. campestre. Most of genetic variation of the latter species was allocated among populations unlike in T.fragiferum and T. montanum.

Depauperated gene pools in Marmota m. marmota are caused by an ancient bottleneck: electrophoretic analysis of wild populations from Austria and Switzerland

80%

Preleuthner M., Pinsker W.

Acta Theriologica. Supplement

1993

tom 38

nr 2

Samples from 15 populations of the Alpine marmot Marmota m. marmota (Linnaeus, 1758) were surveyed electrophoretically for allozyme variation. Only 2 out of 50 enzyme loci showed polymorphism. Average heterozygosity was found to be low with 1.2%. No rare alleles were detected among the 8430 genes examined. The geographic variation at the two polymorphic loci (Pep-1 and Sod-1) was analysed in more detail. The distribution pattern of the allele frequencies indicates genetic differentiation between autochthonous and introduced populations. No striking deviations of the genotype distributions from Hardy-Weinberg equilibrium were observed. Thus the population structure is apparently not affected by inbreeding. The obviously diminished genetic variation and the geographic pattern of the allele frequencies at the two variable loci can be best explained by assuming a severe bottleneck in the recent past.

Ograniczanie wyników

1 Acta Theriologica. Supplement

1 Journal of Applied Genetics

1 Bulinska-Radomska Z.

1 Pinsker W.

1 Preleuthner M.

1 1996

1 1993

Wyniki wyszukiwania

Genetic variation and population structure of three Trifolium species

Depauperated gene pools in Marmota m. marmota are caused by an ancient bottleneck: electrophoretic analysis of wild populations from Austria and Switzerland