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• W2099769894 abstract "A nuclear low-copy gene phylogeny provides strong evidence for the hybrid origin of seven polyploid species in Geinae (Rosaceae). In a gene tree, alleles at homologous loci in an allopolyploid species are expected to be sisters to orthologues in the ancestral taxa rather than to each other. Alleles at a duplicated locus in an autopolyploid, however, are expected to be more closely related to each other than they are to any orthologous copies in closely related species. We cloned and sequenced about 1.9 kilobases from the 5' end of the GBSSI-1 gene from two diploid, one tetraploid, and six hexaploid species. Each of the three loci in the hexaploid species forms a separate group, two of which are more closely related to copies in other species than they are to each other. This finding indicates that the hexaploid lineage evolved through two consecutive allopolyploidization events. Based on the GBSSI-1 gene tree, we hypothesized that there was an initial hybridization between a diploid species from the ancestral lineage of Coluria and Waldsteinia and an unknown diploid species to form the tetraploid Geum heterocarpum lineage. Backcrossing of G. heterocarpum with a representative of the unknown diploid lineage then resulted in a hexaploid lineage that has radiated considerably since its origin, comprising at least 40 extant species with various morphologies. A penalized likelihood analysis indicated that Geinae may be about 17 million years old, implying that the hypothesized allopolyploid speciation events are relatively ancient. Six of the 22 cloned Geinae GBSSI-1 copies in this study, which all are duplicate copies in polyploid taxa, may have become pseudogenes. We compared the GBSSI-1 phylogeny with one from chloroplast data and explored implications for the evolution of some fruit characters." @default.
• W2099769894 created "2016-06-24" @default.
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• W2099769894 date "2003-06-01" @default.
• W2099769894 modified "2023-10-04" @default.
• W2099769894 title "Ancient Allopolyploid Speciation in Geinae (Rosaceae): Evidence from Nuclear Granule-Bound Starch Synthase (GBSSI) Gene Sequences" @default.
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• W2099769894 doi "https://doi.org/10.1080/10635150390197000" @default.
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