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Auteur Douglas E. Soltis (1953-) |
Documents disponibles écrits par cet auteur (3)
Affiner la rechercheMolecular evidence for polyploid origins in Saxifraga (Saxifragaceae) : the narrow arctic endemic S. svalbardensis and its widespread allies / Christian Brochmann in American Journal of Botany, 85 (7) (07/1998)
Titre : Molecular evidence for polyploid origins in Saxifraga (Saxifragaceae) : the narrow arctic endemic S. svalbardensis and its widespread allies Type de document : Imprimé Auteurs : Christian Brochmann (1953-) ; Xiang ; Brunsfeld ; Douglas E. Soltis (1953-) ; Pamela S. Soltis (1957-) Année de publication : 1998 Article en page(s) : 135-143 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Variabilité, analyse de l'ADN, polymorphisme Mots-clés : Saxifraga Saxifraga svalbardensis Résumé : The recently described polyploid Saxifraga svalbardensis is endemic to the arctic archipelago of Svalbard. We investigated relationships among four closely related species of Saxifraga in Svalbard and tested three previously proposed hypotheses for the origin of S. svalbardensis: (1) differentiation from the morphologically and chromosomally variable polyploid S. cernua; (2) hybridization between the diploid S. hyperborea and S. cernua; and (3) hybridization between the tetraploid S. rivularis and S. cernua. Fifteen populations were analyzed using random amplified polymorphic DNAs (RAPDs) and nucleotide sequences of the chloroplast gene matK and the internal transcribed spacers (ITS) of nuclear ribosomal DNA (rDNA). RAPD and matK data suggest that S. svalbardensis has originated from a hybrid with S. rivularis as the maternal parent and S. cernua as the paternal parent, possibly a single time, whereas ITS data could not be used to discriminate among the hypotheses. The data also suggest that the diploid S. hyperborea is a progenitor of the tetraploid S. rivularis. The four populations examined of S. svalbardensis were virtually identical for RAPD and ITS markers, whereas S. cernua showed high levels of variation, suggesting that the latter polyploid either has formed recurrently or has undergone considerable differentiation since its origin. Lien pérenne : DOI : 10.2307/2446562 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=138291
in American Journal of Botany > 85 (7) (07/1998) . - 135-143Brochmann, Christian (1953-), Xiang, Brunsfeld, Soltis, Douglas E. (1953-), Soltis, Pamela S. (1957-) 1998 Molecular evidence for polyploid origins in Saxifraga (Saxifragaceae) : the narrow arctic endemic S. svalbardensis and its widespread allies. American Journal of Botany, 85(7): 135-143.Documents numériques
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Article (1998)URL
Titre : Phylogenetic inference in Saxifragaceae sensu stricto en Gilia (Polemoniaceae) using matK sequences Type de document : Imprimé Auteurs : Johnson ; Douglas E. Soltis (1953-) Année de publication : 1995 Article en page(s) : 149-175 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Phylogénie (liens existant entre espèces apparentées)
[CBNPMP-Thématique] Variabilité, analyse de l'ADN, polymorphismeEn ligne : https://www.biodiversitylibrary.org/page/27995517 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=138296
in Annals of the Missouri Botanical Garden > 82 (1995) . - 149-175Johnson, Soltis, Douglas E. (1953-) 1995 Phylogenetic inference in Saxifragaceae sensu stricto en Gilia (Polemoniaceae) using matK sequences. Annals of the Missouri Botanical Garden, 82: 149-175.
Titre : The role of genetic and genomic attributes in the success of polyploids Type de document : Imprimé Auteurs : Pamela S. Soltis (1957-) ; Douglas E. Soltis (1953-) Année de publication : 2000 Article en page(s) : 310-329 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Génétique et écologie (dynamique, démographique, sélection)
[CBNPMP-Thématique] RevégétalisationRésumé : In 1950, G. Ledyard Stebbins devoted two chapters of his book Variation and Evolution in Plants (Columbia Univ. Press, New York) to polyploidy, one on occurrence and nature and one on distribution and significance. Fifty years later, many of the questions Stebbins posed have not been answered, and many new questions have arisen. In this paper, we review some of the genetic attributes of polyploids that have been suggested to account for the tremendous success of polyploid plants. Based on a limited number of studies, we conclude: (i) Polyploids, both individuals and populations, generally maintain higher levels of heterozygosity than do their diploid progenitors. (ii) Polyploids exhibit less inbreeding depression than do their diploid parents and can therefore tolerate higher levels of selfing; polyploid ferns indeed have higher levels of selfing than do their diploid parents, but polyploid angiosperms do not differ in outcrossing rates from their diploid parents. (iii) Most polyploid species are polyphyletic, having formed recurrently from genetically different diploid parents. This mode of formation incorporates genetic diversity from multiple progenitor populations into the polyploid “species”; thus, genetic diversity in polyploid species is much higher than expected by models of polyploid formation involving a single origin. (iv) Genome rearrangement may be a common attribute of polyploids, based on evidence from genome in situ hybridization (GISH), restriction fragment length polymorphism (RFLP) analysis, and chromosome mapping. (v) Several groups of plants may be ancient polyploids, with large regions of homologous DNA. These duplicated genes and genomes can undergo divergent evolution and evolve new functions. These genetic and genomic attributes of polyploids may have both biochemical and ecological benefits that contribute to the success of polyploids in nature. Lien pérenne : DOI : 10.1073/pnas.97.13.7051 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=149012
in Proceedings of the National Academy of Sciences of the United States of America > 97 (13) (June 2000) . - 310-329Soltis, Pamela S. (1957-), Soltis, Douglas E. (1953-) 2000 The role of genetic and genomic attributes in the success of polyploids. Proceedings of the National Academy of Sciences of the United States of America, 97(13): 310-329.Documents numériques
Article (2000)URL
