Genetic variation in the Lotus corniculatus complex (Fabaceae) in northern Eurasia as inferred from nuclear microsatellites and plastid trnL-trnF sequencesстатья

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[1] Genetic variation in the lotus corniculatus complex (fabaceae) in northern eurasia as inferred from nuclear microsatellites and plastid trnl-trnf sequences / T. E. Kramina, I. G. Meschersky, G. V. Degtjareva et al. // Botanical Journal of the Linnean Society. — 2018. — P. 1–30. Background and aims: Lotus corniculatus complex (Fabaceae, Loteae) is a polyploid group with a ploidy level usually ranging from diploid (2n=2x=12) to tetraploid (2n=4x=24). Monophyly of the complex was supported by recent phylogenetic analyses, however evolutionary relationships within it remained debatable. The present study aims to outline species relationships within the Lotus corniculatus complex and evolutionary history of the group in Eastern Europe and Northern Asia. Methods: The genetic variability (trnL–trnF cp DNA and eight nuclear microsatellite loci) is described in 51 local populations of six species of the Lotus corniculatus complex (i.e., diploid L. krylovii, L. frondosus, L. tenuis and L. stepposus and tetraploid L. corniculatus and L. ×ucrainicus) in Northern Eurasia and compared to the patterns of morphological differentiation. A representative set of species of the section Lotus was included in phylogenetic and phylogeographic analyses. Results: The morphological and genetic variation patterns indicate sporadic interspecific hybridization in sympatric zones. The genetic structure of the species is different in the European and Asian parts of the distribution area. Taxonomic significance of indels in the trnL-F region is confirmed by phylogenetic studies of the section Lotus. A reconstructed cp haplotype network of the L. corniculatus group documented a haplotype A closest to the hypothetical ancestral type in one of the Mediterranean glacial refugia. Conclusion: The proposed phylogeographic scenario suggests the European origin of Lotus corniculatus complex and its geographic expansion parallel to the changes in cp haplotypes from the group A in West Europe to the group D in Central Asia, as well as the existence of a possible “southern” lineage represented by E haplotype group. The decrease of population genetic variability in the Asian part is likely due to the change of prevailing mating system from cross-pollination to autogamy. ADDITIONAL KEYWORDS: cp DNA – haplotype network – Fabaceae – Loteae - nuclear SSRs – phylogeography – population genetic structure. [ DOI ]

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