LamyBouchardSimon1999

Référence

Lamy, S., Bouchard, A., Simon, J.P. (1999) Genetic structure, variability, and mating system in eastern white cedar (thuja occidentalis) populations of recent origin in an agricultural landscape in southern quebec. Canadian Journal of Forest Research, 29(9):1383-1392.

Résumé

The genetic variability, genetic structure, and mating system of six small, isolated eastern white cedar (Thuja occidentalis L.) populations of recent origin from southwestern Quebec were analyzed using Cellulose acetate gel electrophoresis of enzymes extracted from haploid megagametophytes. The analysis of 20 loci showed an average polymorphism of 54.2%, a mean of 1.6 alleles per locus, a mean of 1.15 effective alleles per locus, and observed and expected levels of heterozygosity of 0.116 and 0.129, respectively. There were no significant differences among the six populations for these five genetic parameters. Estimated F(1S) (Wright's fixation indice) values indicated an excess of homozygotes as compared with the expected values under Hardy-Weinberg equilibrium. The average F(ST) value indicated that 7.3% of the total variability could be attributed to differences among the populations. The multiloci estimates of outcrossing rate (t(m)) were 0.240 and 0.335, respectively, in each of two populations, our estimates of the relative contribution of consanguineous matings to the total effective selfing rate averaged about 14%. Results suggest that vegetative propagation is the main factor contributing to family substructuring in these populations of recent origin and contrast with those reported for Ontario populations of T. occidentalis sampled in natural forest environments.

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@ARTICLE { LamyBouchardSimon1999,
    AUTHOR = { Lamy, S. and Bouchard, A. and Simon, J.P. },
    TITLE = { Genetic structure, variability, and mating system in eastern white cedar (thuja occidentalis) populations of recent origin in an agricultural landscape in southern quebec },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 1999 },
    VOLUME = { 29 },
    PAGES = { 1383-1392 },
    NUMBER = { 9 },
    NOTE = { 00455067 (ISSN) Cited By (since 1996): 6 Export Date: 26 April 2007 Source: Scopus CODEN: CJFRA Language of Original Document: English Correspondence Address: Simon, J.-P.; Departement de sciences biologiques; Universite de Montreal; Centre-ville Branch; P.O. Box 6128 Montreal, QC H3C 3J7, Canada; email: simonj@POSTE.UMontreal.ca References: Beaulieu, J., Simon, J.-P., Genetic structure and variability in Pinus strobus in Quebec (1994) Can. J. For. Res., 24, pp. 1726-1733; Beaulieu, J., Simon, J.-P., Mating systems in natural populations of eastern pine in Quebec (1995) Can. J. For. Res., 25, pp. 1697-1703; Bouchard, A., Domon, G., The transformation of the natural landscapes of the Haut-Saint-Laurent (Quebec) and its implication on future resources management (1997) Landscape Urban Plann., 37, pp. 99-107; Brisson, J., Bergeron, Y., Bouchard, A., Les successions secondaires sur sites me?siques dans le Haut-Saint-Laurent, Que?bec, Canada (1988) Can. J. Bot., 66, pp. 1192-1203; Cheliak, W.M., Pitel, J.A., Murray, G., Population structure and the mating system of white spruce (1985) Can. J. For. Res., 15, pp. 301-308; De Blois, S., La dynamique du thuya occidental (Thuja occidentalis L.) dans un paysage agro-forestier du Haut-Saint-Laurent, Que?bec (1994) Me?moire de Mai?trise, , Universite? de Montre?al, Montre?al, Que; De Blois, S., Bouchard, A., Dynamics of Thuja occidentalis in an agricultural landscape of southern Quebec (1995) J. Veg. Sci., 6, pp. 531-542; Domon, G., Bouchard, A., Garie?py, M., The dynamics of the forest landscape of Haut-Saint-Laurent (Quebec, Canada): Interactions between biophysical factors, perceptions and policy (1993) Landscape Urban Plann., 25, pp. 53-74; El-Kassaby, Y.A., Meagher, M.D., Parkinson, J., Portlock, F.T., Allozyme inheritance, heterozygosity and outcrossing rate among Pinus monticola populations near Ladysmith, British Columbia (1987) Heredity, 58, pp. 173-181; El-Kassaby, Y.A., Russell, J., Ritland, K., Mixed mating in an experimental population of western red cedar, Thuja plicata (1994) J. Hered., 85, pp. 227-231; Fowells, H.A., Silvics of forest trees of the United States (1965) U.S. Dep. Agric. Agric. Handb., 271; Fowler, D.P., Park, Y.S., Population studies of white spruce I. Effects of self-pollination (1983) Can. J. For. 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Variability within and Among Natural Populations, 4. , University of Chicago Press, Chicago, Ill; Xie, C.Y., Dancik, B.P., Yeh, F.C., Inheritance and linkage of isozymes in Thuja orientalis (1991) J. Hered., 82, pp. 329-334; Yeh, F.C., Isozyme variation of Thuja plicata (Cupressaceae) in British Columbia (1988) Biochem. Syst. Ecol., 16, pp. 373-377. },
    ABSTRACT = { The genetic variability, genetic structure, and mating system of six small, isolated eastern white cedar (Thuja occidentalis L.) populations of recent origin from southwestern Quebec were analyzed using Cellulose acetate gel electrophoresis of enzymes extracted from haploid megagametophytes. The analysis of 20 loci showed an average polymorphism of 54.2%, a mean of 1.6 alleles per locus, a mean of 1.15 effective alleles per locus, and observed and expected levels of heterozygosity of 0.116 and 0.129, respectively. There were no significant differences among the six populations for these five genetic parameters. Estimated F(1S) (Wright's fixation indice) values indicated an excess of homozygotes as compared with the expected values under Hardy-Weinberg equilibrium. The average F(ST) value indicated that 7.3% of the total variability could be attributed to differences among the populations. The multiloci estimates of outcrossing rate (t(m)) were 0.240 and 0.335, respectively, in each of two populations, our estimates of the relative contribution of consanguineous matings to the total effective selfing rate averaged about 14%. Results suggest that vegetative propagation is the main factor contributing to family substructuring in these populations of recent origin and contrast with those reported for Ontario populations of T. occidentalis sampled in natural forest environments. },
    KEYWORDS = { genetic structure genetic variation reproductive strategy Canada Thuja occidentalis },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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