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• W2045171805 abstract "Taraxacum officinale L. (dandelion) is a vigorous weed in Europe with diploid sexual populations in the southern regions and partially overlapping populations of diploid sexuals and triploid or tetraploid apomicts in the central and northern regions. Previous studies have demonstrated unexpectedly high levels of genetic variation in the apomictic populations, suggesting the occurrence of genetic segregation in the apomicts and (or) hybridization between sexual and apomictic individuals. In this study we analysed meiosis in both sexual diploid and apomictic triploid plants to find mechanisms that could account for the high levels of genetic variation in the apomicts. Microscopic study of microsporocytes in the triploid apomicts revealed that the levels of chromosome pairing and chiasma formation at meiotic prophase I were lower than in that of the sexual diploids, but still sufficient to assume recombination between the homologues. Nomarski DIC (differential interference contrast) microscopy of optically cleared megasporocytes in the apomicts demonstrated incidental formation of tetrads, which suggests that hybridization can occur in triploid apomicts.Key words: apomixis, autosegregation, diplospory, meiotic recombination, meiotic restitution, subsexual reproduction." @default.
• W2045171805 created "2016-06-24" @default.
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• W2045171805 date "2000-10-01" @default.
• W2045171805 modified "2023-09-30" @default.
• W2045171805 title "Meiotic recombination in sexual diploid and apomictic triploid dandelions (<i>Taraxacum officinale</i> L.)" @default.
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• W2045171805 doi "https://doi.org/10.1139/g00-047" @default.
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