A Multilocus Study of Natural Populations of Pinus sylvestris

Muona, Outi; Szmidt, Alfred E.

doi:10.1007/978-3-642-48125-3_15

Cited by 36 publications

(16 citation statements)

References 23 publications

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“…The absence of heterozygote deficit in juveniles could be due to their age (more than 10 years old) or, in the Lazerque open forest, by unlimited gene flow. An heterozygote excess can be explained by differences in allelic frequencies between ovule and pollen pools (Ziehe, 1983;Cheliak, 1985;Muona & Szmidt, 1985). Such differences would have occurred in Issaux forest where the regeneration occurs in forest openings (gap-generation) (Cuguen, 1986;Nakashizuka, 1984), a feature which would have induced both an increase in pollen flow and a reduction in the number of mother-trees (and therefore of the ovule pool) producing groups of allelic frequencies which are not generally representative of the population.…”

Section: Discussionmentioning

confidence: 99%

Genetic structure of natural stands of Fagus sylvatica L. (beech)

et al. 1994

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The spatial genetic structures of three French natural beech stands were analysed using polymorphic enzyme loci. Two methods were used: F-statistics and spatial autocorrelation statistics. Within these stands where self-fertilization rate is 0, a low heterozygote deficit was observed which may be due to a moderate level of mating between relatives. However, no increase of this deficit was observed from one generation to the next. The spatial genetic structuring was low. Within one open stand composed of several patches, founder events are invoked to explain a significant autocorrelation. Within the two other stands, both dense, results are similar to those produced by simulations of an isolation by distance model. The genetic structure seems not to be stable in space and time which may be due to (i) a limited number of generations; (ii) an effective gene flow less limited than hypothesized; and (iii) fertility differences or phenological incompatibilities between individuals.

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Section: Discussionmentioning

confidence: 99%

Genetic structure of natural stands of Fagus sylvatica L. (beech)

et al. 1994

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“…Genetic differentiation in P. sylvestris populations is low and the inferred demographic history similar in all areas of the major European distribution of the species ). Further, allozyme frequencies tend to have similar frequencies over large areas of the distribution area (e.g., Muona and Szmidt 1985;Muona and Harju 1989). Therefore, one population sample sufficiently represents the species' genetic diversity in its main European range.…”

Section: Methodsmentioning

confidence: 96%

Revisiting protein heterozygosity in plants—nucleotide diversity in allozyme coding genes of conifer Pinus sylvestris

Pyhäjärvi

Kujala

Savolainen

2010

Tree Genetics & Genomes

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Allozyme variation has been and continues to be a major source of information on the level of genetic variation among plant species. Deciphering the molecular basis of electrophoretic variation is essential for understanding the forces affecting the protein level variation. In this study, the relationship between allozyme heterozygosity and nucleotide diversity in plants is investigated among and within species. Allozyme and nucleotide diversity in 27 plant species was reviewed. At the multilocus level, the two methods are congruent: a clear correlation between the two measures of genetic diversity among plant species was observed, strengthening the view that effective population size is the major determinant of genome-wide diversity. Nucleotide diversity at six allozyme coding genes (6pgdB, aco, gdh, gotC, mdhA, and mdhB) in conifer Pinus sylvestris was investigated jointly with electrophoretic data. Single non-synonymous charge-changing mutations were found together with electrophoretic alleles that consequently were mutationally unique. Synonymous site nucleotide diversity (point estimate of θ W -0.009 per bp) and silent site divergence from Pinus pinaster at allozyme coding loci were at comparable levels with other loci in the species. Linkage disequilibrium was extensive compared to earlier estimates from P. sylvestris and other trees, spanning several kilobases. Allozyme coding genes had an excess of closely related haplotypes whose frequency has recently increased possibly as a result of partial selective sweeps or balancing selection, but complex demographic effects cannot be excluded.

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“…In order to determine the genetic structure of the pollution-tolerant (T) and pollution-sensitive (S) trees, electrophoresis was used (according to the procedure described by Rudin and Ekberg 1978;Muona and Szmidt 1985;Prus-G³owacki and Nowak-Bzowy 1992).…”

Section: Analysis Of Biological Materialsmentioning

confidence: 99%

Effects of heavy metal pollution on genetic variation and cytological disturbances in thePinus sylvestris L. population

et al. 2006

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This isoenzymatic and cytogenetic study has shown significant differences in genetic composition between two groups of Pinus sylvestris trees: tolerant and sensitive to heavy metal pollution. Total and mean numbers of alleles and genotypes per locus were higher in the pollution-sensitive group of trees, but heterozygosity (Ho) was lower in this group. Fixation index (F) indicates that trees tolerant for pollution were in the Hardy-Weinberg equilibrium, while the sensitive group had a significant excess of homozygosity. Cytological analyses demonstrated numerous aberrations of chromosomes in meristematic root tissue of seedlings developed from seeds collected from trees in the polluted area. The aberrations included chromosome bridges and stickiness, laggards, retarded and forward chromosomes, and their fragments. The mitotic index was markedly lower in this group of seedlings, as compared to the control. Both isoenzymatic and cytological analyses showed a significant influence of heavy metal ions on the genetic structure of the Pinus sylvestris population.

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A Multilocus Study of Natural Populations of Pinus sylvestris

Cited by 36 publications

References 23 publications

Genetic structure of natural stands of Fagus sylvatica L. (beech)

Genetic structure of natural stands of Fagus sylvatica L. (beech)

Revisiting protein heterozygosity in plants—nucleotide diversity in allozyme coding genes of conifer Pinus sylvestris

Effects of heavy metal pollution on genetic variation and cytological disturbances in thePinus sylvestris L. population

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