KhasaBousquet2001

Référence

Khasa, D.P., Bousquet, J. (2001) Multivariate analysis of allozyme and morphometric variability in Racosperma auriculiforme and R-mangium. Silvae Genetica, 50(5-6):191-199.

Résumé

We investigated the levels and distribution of genetic variation of Racosperma auriculiforme (Acacia auriculiformis) and R. mangium (A. mangium), using multivariate analysis of allozymes and phenotypic attributes. The patterns of genetic variation based on allozymes were similar to those based on phenotypic attributes for R. auriculiforme. In R. mangium, there was, however, a lack of correspondence between phenotypic attributes and allozymes. For R. auriculiforme, these results suggest that initial isozyme surveys of a limited number of populations covering the species' geographic range could help define more efficient sampling strategies for intense seed collections and large scale provenance-progeny tests. For R. mangium, the results, however, suggest that we should rely mainly on genecological studies to establish guidelines for seed transfer in applied tree improvement programs. The allozyme diversity revealed that R. mangium was genetically depauperate compared to R. auriculiforme. The genecological diversity in quantitative traits over four sites indicated that R. auriculiforme is more plastic than R. mangium, both showing a geographical pattern of population differentiation. Genetic diversity parameters were negatively correlated with the latitude for R. auriculiforme, suggesting Papua New Guinea as a centre of diversity. On the other hand, genetic diversity parameters were negatively correlated with the elevation for R. mangium. Canonical correlation analysis revealed two and one significant canonical variates for R. auriculiforme and R. mangium respectively. It also revealed significant association between geographic origins and some allozymes and adaptive quantitative traits. Both principal components and discriminant analyses revealed a clear pattern of population grouping related to taxon delineation and could be used to detect possible introgression between the two species. For both species, factor and discriminant variable scores, derived from principal components and discriminant analyses, exhibited strong relation with location variables: latitude, longitude and elevation.

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@ARTICLE { KhasaBousquet2001,
    AUTHOR = { Khasa, D.P. and Bousquet, J. },
    TITLE = { Multivariate analysis of allozyme and morphometric variability in Racosperma auriculiforme and R-mangium },
    JOURNAL = { Silvae Genetica },
    YEAR = { 2001 },
    VOLUME = { 50 },
    PAGES = { 191-199 },
    NUMBER = { 5-6 },
    NOTE = { Times Cited: 0 Article English Cited References Count: 48 553nn },
    ABSTRACT = { We investigated the levels and distribution of genetic variation of Racosperma auriculiforme (Acacia auriculiformis) and R. mangium (A. mangium), using multivariate analysis of allozymes and phenotypic attributes. The patterns of genetic variation based on allozymes were similar to those based on phenotypic attributes for R. auriculiforme. In R. mangium, there was, however, a lack of correspondence between phenotypic attributes and allozymes. For R. auriculiforme, these results suggest that initial isozyme surveys of a limited number of populations covering the species' geographic range could help define more efficient sampling strategies for intense seed collections and large scale provenance-progeny tests. For R. mangium, the results, however, suggest that we should rely mainly on genecological studies to establish guidelines for seed transfer in applied tree improvement programs. The allozyme diversity revealed that R. mangium was genetically depauperate compared to R. auriculiforme. The genecological diversity in quantitative traits over four sites indicated that R. auriculiforme is more plastic than R. mangium, both showing a geographical pattern of population differentiation. Genetic diversity parameters were negatively correlated with the latitude for R. auriculiforme, suggesting Papua New Guinea as a centre of diversity. On the other hand, genetic diversity parameters were negatively correlated with the elevation for R. mangium. Canonical correlation analysis revealed two and one significant canonical variates for R. auriculiforme and R. mangium respectively. It also revealed significant association between geographic origins and some allozymes and adaptive quantitative traits. Both principal components and discriminant analyses revealed a clear pattern of population grouping related to taxon delineation and could be used to detect possible introgression between the two species. For both species, factor and discriminant variable scores, derived from principal components and discriminant analyses, exhibited strong relation with location variables: latitude, longitude and elevation. },
    KEYWORDS = { acacia genetic variation plantation forestry in the tropics multivariate analysis racosperma social forestry acacia-auriculiformis genetic diversity quantitative traits jack pine ex-benth heterozygosity hybridization zaire introgression populations },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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