Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"The mating system in a Scots pine clonal seed orchard in Poland. | Ann Sci For 1991 48 443-451 Elsevier INRA 443 Original article The mating system in a Scots pine clonal seed orchard in Poland J Burczyk Polish Academy of Sciences Institute of Dendrology Department of Genetics . 62 - 035 Kornik Poland Received 13 November 1990 accepted 8 April 1991 Summary The mating system of a clonal seed orchard of Pinus sylvestris L consisting of 32 clones was studied using allozyme marker loci. Single-locus estimates of outcrossing rate ranged from with a mean of while the multilocus estimate was . The outcrossing rates of individual trees ranged from . The variance effective population size estimated for males was equivalent to 14 individuals. Some patterns of non-random mating were found. The level of inbreeding as measured by average fixation indices was low both in the parental and the filial generations. The usefulness of Scots pine seed orchards in forest tree improvement has been discussed in the light of genetic efficiency. Pinus sylvestris L seed orchard outcrossing inbreeding I variance effective population size Resume Système de croisements dans une pinède de clones de pins Sylvestres issus de graines en Pologne. Le systems de croisements dans une pinède de Pinus sylvestris composes de 32 clones est étudié grace à des locus d allozymes marqueurs. On estime d apres le taux de croisements les locus uniques à 0 907-1 106 moyenne 1 011 etles locus multiples à 0 987. Les taux de croisements d arbres considérés individuellement sont de 0 840-1 208. On évalue la population de males utilisée pour la determination de la variance à 14 indivldus. On trouve quelques mo-dèles de croisement non aléatoire. Le niveau dinbreeding mesuré par les index de fixation moyenne est faible aussl bien dans les generations parentales que dans les generations filles. L utilite pour I amelioration des arbres forestiers de pinèdes de pins Sylvestres dont les individus sont issus de graines est discutée en termes d efficacite .
