The Divergence History of Two Japanese Torreya Taxa (Taxaceae): Implications for Species Diversification in the Japanese Archipelago

Plants, Journal Year: 2025, Volume and Issue: 14(10), P. 1537 - 1537

Published: May 20, 2025

The Japanese archipelago as a continental island of the Eurasia continent and harboring high levels plant species diversity provides an ideal geographical setting for investigating vicariant allopatric speciation due to sea-level fluctuations associated with climatic oscillations during Quaternary. In this study, three chloroplast DNA regions 14 nuclear loci were sequenced 31 individuals from populations Torreya nucifera var. 52 T. radicans. Population genetic analyses (Network, STRUCTURE phylogeny) revealed that boundaries two varieties are distinct, differentiation (FST) 0.9619 in 0.6543 loci. relatively ancient divergence times between estimated 3.03 Ma by DIYABC 1.77 IMa2 when dated back late Pliocene early Pleistocene, respectively. extremely weak gene flow (2Nm = 0.1) was detected IMa2, which might be caused their population expansion since Pleistocene (~2.0 Ma) inferred Bayesian skyline plots DIYABC. Niche modeling showed had significant ecological (p < 0.001) Last Interglacial even earlier. These results demonstrate may common mode archipelago. This finding insights into understanding diversification Archipelago East Asian flora under

Language: Английский

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Population differentiation and dynamics of five pioneer species of Gaultheria from the secondary forests in subtropical China

BMC Plant Biology, Journal Year: 2024, Volume and Issue: 24(1)

Published: June 8, 2024

Abstract Background The influence of native secondary succession associated with anthropogenic disturbance on the biodiversity forests in subtropical China remains uncertain. In particular, evolutionary response small understory shrubs, particularly pioneer species inhabiting continuously disturbed habitats, to topographic heterogeneity and climate change is poorly understood. This study aimed address this knowledge gap by focusing Gaultheria crenulata group, a clade shrubs China. Results We examined genetic structure demographic history all five G. group two maternally inherited chloroplast DNA (cpDNA) fragments biparentally low-copy nuclear genes (LCG) over 89 natural populations. found that differentiation was influenced geomorphological boundary between different regions association Quaternary climatic events. Despite low overall diversity, we observed an isolation-by-distance (IBD) pattern at regional scale, rather than isolation-by-environment (IBE), which attributed ongoing human region. Conclusion Our findings suggest reflects interplay geological topography, historical climates, during Pliocene–Pleistocene-Holocene periods IBD pattern, prominent western China, highlights role limited dispersal gene flow, possibly physical barriers or decreased connectivity geographic distance. Furthermore, east-to-west trend potentially facilitated East Asian monsoon system, underscores complex biotic abiotic factors shaping dynamics China’s forests. These can be used assess impact environmental changes adaptation persistence forest ecosystems.

Language: Английский

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Alien Species Introduction and Demographic Changes Contributed to the Population Genetic Structure of the Nut-Yielding Conifer Torreya grandis (Taxaceae)

Forests, Journal Year: 2024, Volume and Issue: 15(8), P. 1451 - 1451

Published: Aug. 17, 2024

Understanding population genetic structure and its possible causal factors is critical for utilizing resources breeding of economically important plants. Although Torreya grandis an conifer producing nuts in China, little known about structure, let alone the that shaped variation pattern structure. In this work, we intended to characterize nut-yielding T. throughout whole geographical distribution further explore potentially using multiple approaches. A moderate level diversity a novel were revealed based on eleven robust EST-SSR loci three chloroplast fragments. Alien composition derived from closely related species nucifera endemic Japan was detected Kuaiji Mountain area, where seed quality considered best China. Demography history niche modeling inferred performed, contribution geographic isolation compared with environmental isolation. Significant demographic changes occurred, including dramatic contraction during Quaternary, divergence significantly correlated distance. These results suggested early activities contributed grandis. turn, associated excellent variants adaptation cultivars The findings provide information future.

Language: Английский

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Population connectivity and size reductions in the Anthropocene: the consequence of landscapes and historical bottlenecks in white forsythia fragmented habitats

BMC Ecology and Evolution, Journal Year: 2024, Volume and Issue: 24(1)

Published: Oct. 10, 2024

White forsythia (Abeliophyllum distichum) is an endangered Korean Peninsula endemic that has been subjected to recent population genomics studies using SNPs via RAD sequencing. Here, we primarily employed the often underutilized haplotype information from loci further describe species' previously uninvestigated haplotype-based genomic variation and structure, genetic-geographic characteristics gene flow patterns among its five earlier identified genetic groups. We also inferred time of past events may have impacted effective size these groups, as well potential future distribution amidst warming climate anthropogenic threats.

Language: Английский

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