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• W2165033437 endingPage "269" @default.
• W2165033437 startingPage "253" @default.
• W2165033437 abstract "The taxonomic complexity of Crataegus (hawthorn; Rosaceae, Maleae), especially in North America, has been attributed by some to hybridization in combination with gametophytic apomixis and polyploidization, whereas others have considered the roles of hybridization and apomixis to be minimal. Study of the chemical composition and therapeutic value of hawthorn extracts requires reproducible differentiation of entities that may be difficult to distinguish by morphology alone. This study sought to address this by using the nuclear ribosomal spacer region ITS2 as a supplementary DNA barcode; however, a lack of success prompted an investigation to discover why this locus gave unsatisfactory results.ITS2 was extensively cloned so as to document inter- and intraindividual variation in this locus, using hawthorns of western North America where the genus Crataegus is represented by only two widely divergent groups, the red-fruited section Coccineae and the black-fruited section Douglasia. Additional sequence data from selected loci on the plastid genome were obtained to enhance further the interpretation of the ITS2 results.In the ITS2 gene tree, ribotypes from western North American hawthorns are found in two clades. Ribotypes from diploid members of section Douglasia occur in one clade (with representatives of the east-Asian section Sanguineae). The other clade comprises those from diploid and polyploid members of section Coccineae. Both clades contribute ribotypes to polyploid Douglasia. Data from four plastid-derived intergenic spacers demonstrate the maternal parentage of these allopolyploids.Repeated hybridization between species of section Douglasia and western North American members of section Coccineae involving the fertilization of unreduced female gametes explains the observed distribution of ribotypes and accounts for the phenetic intermediacy of many members of section Douglasia." @default.
• W2165033437 created "2016-06-24" @default.
• W2165033437 creator A5034906982 @default.
• W2165033437 creator A5036683661 @default.
• W2165033437 creator A5069605032 @default.
• W2165033437 date "2014-07-01" @default.
• W2165033437 modified "2023-10-18" @default.
• W2165033437 title "Reticulate evolution in North American black-fruited hawthorns (Crataegus section Douglasia; Rosaceae): evidence from nuclear ITS2 and plastid sequences" @default.
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• W2165033437 doi "https://doi.org/10.1093/aob/mcu116" @default.
• W2165033437 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4111394" @default.
• W2165033437 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24984714" @default.
• W2165033437 hasPublicationYear "2014" @default.
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