High genetic diversity in American chestnut (Castanea dentata) despite a century of decline

Stoltz, Sophia S.; Husband, Brian C.

doi:10.1007/s10592-022-01473-3

Conserv Genet

2022

DOI: 10.1007/s10592-022-01473-3

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High genetic diversity in American chestnut (Castanea dentata) despite a century of decline

Sophia S. Stoltz

Brian C. Husband

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Cited by 2 publications

References 81 publications

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Lineage diversification and rampant hybridization among subspecies explain taxonomic confusion in the endemic Hawaiian fern Polypodium pellucidum

Mendez‐Reneau,

Richards,

Hobbie

et al. 2024

American J of Botany

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PremisePolypodium pellucidum, a fern endemic to the Hawaiian Islands, encompasses five ecologically and morphologically variable subspecies, suggesting a complex history involving both rapid divergence and rampant hybridization.MethodsWe employed a large target‐capture data set to investigate the evolution of genetic, morphological, and ecological variation in P. pellucidum. With a broad sampling across five Hawaiian Islands, we deciphered the evolutionary history of P. pellucidum, identified nonhybrid lineages and intraspecific hybrids, and inferred the relative influence of geography and ecology on their distributions.ResultsPolypodium pellucidum is monophyletic, dispersing to the Hawaiian archipelago 11.53–7.77 Ma and diversifying into extant clades between 5.66 and 4.73 Ma. We identified four nonhybrid clades with unique morphologies, ecological niches, and distributions. Additionally, we elucidated several intraspecific hybrid combinations and evidence for undiscovered or extinct “ghost” lineages contributing to extant hybrid populations.ConclusionsWe provide a foundation for revising the taxonomy of P. pellucidum to account for cryptic lineages and intraspecific hybrids. Geologic succession of the Hawaiian Islands through cycles of volcanism, vegetative succession, and erosion has determined the available habitats and distribution of ecologically specific, divergent clades within P. pellucidum. Intraspecific hybrids have likely arisen due to ecological and or geological transitions, often persisting after the local extinction of their progenitors. This research contributes to our understanding of the evolution of Hawai'i's diverse fern flora and illuminated cryptic taxa to allow better‐informed conservation efforts.

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Lineage diversification and rampant hybridization among subspecies explain taxonomic confusion in the endemic Hawaiian fern Polypodium pellucidum

Mendez‐Reneau,

Richards,

Hobbie

et al. 2024

American J of Botany

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Genetic diversity and conservation of Siberian apricot (Prunus sibirica L.) based on microsatellite markers

Wang

Sun

et al. 2023

Sci Rep

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Siberian apricot (Prunus sibirica L.) is a woody tree species of ecological, economic, and social importance. To evaluate the genetic diversity, differentiation, and structure of P. sibirica, we analyzed 176 individuals from 10 natural populations using 14 microsatellite markers. These markers generated 194 alleles in total. The mean number of alleles (13.8571) was higher than the mean number of effective alleles (6.4822). The average expected heterozygosity (0.8292) was higher than the average observed heterozygosity (0.3178). Shannon information index and polymorphism information content were separately 2.0610 and 0.8093, demonstrating the rich genetic diversity of P. sibirica. Analysis of molecular variance revealed that 85% of the genetic variation occurred within populations, with only 15% among them. The genetic differentiation coefficient and gene flow were separately 0.151 and 1.401, indicating a high degree of genetic differentiation. Clustering results showed that a genetic distance coefficient of 0.6 divided the 10 natural populations into two subgroups (subgroups A and B). STRUCTURE and principal coordinate analysis divided the 176 individuals into two subgroups (clusters 1 and 2). Mantel tests revealed that genetic distance was correlated with geographical distance and elevation differences. These findings can contribute to the effective conservation and management of P. sibirica resources.

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High genetic diversity in American chestnut (Castanea dentata) despite a century of decline

Cited by 2 publications

References 81 publications

Lineage diversification and rampant hybridization among subspecies explain taxonomic confusion in the endemic Hawaiian fern Polypodium pellucidum

Lineage diversification and rampant hybridization among subspecies explain taxonomic confusion in the endemic Hawaiian fern Polypodium pellucidum

Genetic diversity and conservation of Siberian apricot (Prunus sibirica L.) based on microsatellite markers

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