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4 results for “Magnolia salicifolia”
Data from: Asymmetric introgression between Magnolia stellata and M. salicifolia at a site where the two species grow sympatrically
In order to understand the ongoing evolutionary relationships between species, it is important to elucidate patterns of natural hybridization. In the zone where two species are sympatrically distributed, we examined 274 individuals of Magnolia stellata, Magnolia salicifolia, and their putative hybrids by means of 16 nuclear and three chloroplast microsatellite markers. Hybrid classes of individuals were estimated by admixture analyses. Morphological traits were also investigated for 64 of the 274 individuals. Admixture analyses revealed that 66 of the 274 individuals were classified as hybrids, comprising 17 F1 and 19 F2 individuals, 27 backcrosses to M. salicifolia, and 3 individuals of unknown origin. Morphological data from the 64 individuals agreed well with their genetic admixture rates. Spatial locations of F1 and F2 hybrids at the study site were intermediate between the two purebred species, indicating that the site preferences of hybrids are intermediate. The occurrences of F2 and backcross hybrids indicate that F1 hybrids are fertile. The chloroplast DNA haplotypes of all F1 hybrids corresponded to those detected in M. salicifolia, so that maternal parents of the F1 hybrids were all M. salicifolia. Furthermore, no hybrid individuals derived from a backcross to M. stellata were detected. These results suggest that the direction of hybridization and the subsequent introgression have been quite asymmetric and that the introgression occurred from M. stellata into M. salicifolia.
Data from: Morphological and genetic divergence between two lineages of Magnolia salicifolia (Magnoliaceae) in Japan
Uncovering how populations of a species differ genetically and ecologically is important for understanding evolutionary processes. We investigated genetic structure using nuclear microsatellites and chloroplast DNA sequences and geographical variation in leaf morphological traits among Magnolia salicifolia populations across its entire species range. Two distinct lineages, northern and southern lineages, were genetically detected and both lineages had substructure among populations. The width/length ratio and area of leaves showed latitudinal gradients, while the position of the maximum leaf width exhibited a discontinuous change between the lineages. Approximate Bayesian computation detected exponential population growth and stable population size from the past to the present in the northern and southern lineages, respectively. Small amounts of migrations between the lineages were inferred. Divergence time between the lineages was estimated to be the early to middle Pleistocene. Ecological niche modeling showed single large potential distribution area on the Sea of Japan side and multiple intermittent ones on the Pacific Ocean side during the last glacial maximum. We suggest that these distinct evolutionary histories of the northern and southern lineages after diversification have influenced not only neutral markers but also genes controlling leaf morphological traits.
Data from: Morphological and genetic divergence between two lineages of Magnolia salicifolia (Magnoliaceae) in Japan
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Data from: Asymmetric introgression between Magnolia stellata and M. salicifolia at a site where the two species grow sympatrically
Open the record for dataset details and reuse information.
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