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Levels of genetic diversity at different stages of the domestication cycle of interior spruce in British Columbia

Concerns over the reductionist nature of the domestication of forest-tree species focus on the possibility of potential genetic erosion during this process. To address these concerns, genetic diversity assessments in a breeding zone the Province of British Columbia "interior" spruce (Picea...

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Published in:Theoretical and applied genetics 1997, Vol.94 (1), p.83-90
Main Authors: Stoehr, M.U, El-Kassaby, Y.A. (Glyn Road Research Station, Victoria, B.C. (Canada). Ministry of Forests)
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description Concerns over the reductionist nature of the domestication of forest-tree species focus on the possibility of potential genetic erosion during this process. To address these concerns, genetic diversity assessments in a breeding zone the Province of British Columbia "interior" spruce (Picea glauca x engelmanni) program was conducted using allozyme markers. Genetic-variation comparisons were made between natural and production (seed orchard) populations as well as seed and seedling crops produced from the same breeding zone's seed orchard. The natural population sample consisted of a total of 360 trees representing three stands within each of three watersheds present in the Shuswap-Adams low-elevation zone of interior British Columbia. Small amounts of genetic differentiation were observed among the nine natural populations (4%) and this was attributable to extensive gene flow (N(m) = 7). Consequently, the sum of these nine populations was considered as a baseline for the genetic variation present in the breeding zone. The comparisons between the seed orchard and the breeding zone produced a similar percentage of polymorphic loci (%P = 64.7%) while the expected hetrozygosity (H(e)) (0.207 vs 0.210) and the average number of alleles per locus (2.7 vs 2.4) were slightly lower in the seed orchard. A total of seven natural populations' rare alleles (P < 0.007) were not present in the orchard population, while one allele was unique to the orchard. The %P increased to 70.6% in the seedlot, but dropped to the natural populations level (64.7%) in the plantation. The observed increase in %P was a result of pollen contamination in the orchard. It is suspected that the reduction in the plantation was caused by an unintentional selection in the nursery. Simulated roguing in the orchard did not drastically reduce H(e) even if up to 50% of the orchard's clones were rogued. However, roguing was associated with a reduction in the average number of alleles per locus (i.e., sampling effect).
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subjects Alleles
Animal populations
Biological and medical sciences
Biological diversity
Breeding
BRITISH COLUMBIA
Classical genetics, quantitative genetics, hybrids
COLOMBIE BRITANNIQUE
COLUMBIA BRITANICA
Contamination
DISTANCE GENETIQUE
DISTANCIA GENETICA
Domestication
Environmental aspects
FENOTIPOS
Fundamental and applied biological sciences. Psychology
Gene flow
Genetic aspects
GENETIC DISTANCE
Genetic diversity
Genetic research
Genetic variation
Genetics of eukaryotes. Biological and molecular evolution
Identification and classification
PEUPLEMENT SEMENCIER
PHENOTYPE
PHENOTYPES
PICEA ENGELMANNII
PICEA GLAUCA
Plantations
Population genetics
Pteridophyta, spermatophyta
RODAL SEMILLERO
SEED STANDS
Seedlings
SELECCION
SELECTION
Spruce
Vegetals
Watersheds
title Levels of genetic diversity at different stages of the domestication cycle of interior spruce in British Columbia
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