Genetic structure in the nonrewarding, bumblebee-pollinated orchid Calypso bulbosa

Article Abstract:

Genetic structure in the nonrewarding, bumblebee-pollinated orchid Calypso bulbosa has been studied in 21 populations in northern Sweden using F-statistics analyses of variation at three polymorphic allozyme loci. Four populations were made up of two or three distinct patches, so it was possible to evaluate among-patch differentiation. The inbreeding coefficient over all loci within populations was high. The level of genetic differentiation among patches within populations varied among populations. Long-distance seed and pollen dispersal may account for the low to moderate genetic differentiation among populations.

Environmental aspects, Plant genetics, Orchids, Pollination by insects, Insect pollination, Bumblebees

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Additive and non-additive genetic architecture of two different-sized populations of Scabiosa canescens

Article Abstract:

Additive and non-additive genetic architecture of two populations of Scabiosa canescens, a rare and threatened plant in Sweden, is discussed. The populations differ in size. A factorial crossing experiment to estimate additive and dominance (co)variances for eight phenotypic characters in was carried out. The data was used to estimate the additive and dominance genetic (co)variances for the characters. No evidence for genetic erosion was found in the small population vs the larger one. Only weak correspondence between heritabilities for each trait was seen. The mean heritability over characters was consistent between the studies. The variance from maternal effects was too low to be significant.

Reports, Genetic research, Rare plants, Dominance (Genetics)

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Population structure of the wood decay fungus Fomitopsis pinicola

Article Abstract:

Population structure of Fomitopsis pinicola, a wood-decay fungus, is discussed. Three populations from three countries, Sweden, Lithuania and Russia, have been studied using arbitrary primed PCR (AP-PCR). No population differentiation was found despite distance. Methods of somatic incompatibility and AP-PCR were compared for value in detecting genets using a sample of dikaryotic mycelia, with results found congruent.

Lithuania, Switzerland, Russia, Evaluation, Polymerase chain reaction, Variation (Biology), Molds (Fungi), Wood-decaying fungi, Antibody diversity, Heterozygosis, Heterozygote

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