ArticleBMC genetics2018
Assessment of shared alleles in drought-associated candidate genes among southern California white oak species (Quercus sect. Quercus).
Article in BMC genetics, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 20 citations in OpenAlex.
- Genomic introgression underlies environmental adaptation in three species of Chinese wingnuts,Plant diversity · 2025Article
- Divergence and reticulation in the Mexican white oaks: ecological and phylogenomic evidence on species limits and phylogenetic networks in the Quercus laeta complex (Fagaceae).Annals of botany · 2024Article
- Multiomics Molecular Research into the Recalcitrant and OrphanInternational journal of molecular sciences · 2022Review
- Oaks: an evolutionary success story.The New phytologist · 2020Review
- Adaptive introgression as a driver of local adaptation to climate in European white oaks.The New phytologist · 2020Article
- Genetic Variation Related to High Elevation Adaptation Revealed by Common Garden Experiments inFrontiers in genetics · 2019Article
- Ancient introgression drives adaptation to cooler and drier mountain habitats in a cypress species complex.Communications biology · 2019Article
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Authors and funding
5 authors at 4 institutions in 4 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundHybridization and introgression are common phenomena among oak species. These processes can be beneficial by introducing favorable genetic variants across species (adaptive introgression). Given that drought is an important stress, impacting physiological and morphological variation and limiting distributions, our goal was to identify drought-related genes that might exhibit patterns of introgression influenced by natural selection. Using RNAseq, we sequenced whole transcriptomes of 24 individuals from three oaks in southern California: (Quercus engelmannii, Quercus berberidifolia, Quercus cornelius-mulleri) and identified genetic variants to estimate admixture rates of all variants and those in drought genes.
resultsWe found 398,042 variants across all loci and 4352 variants in 139 drought candidate genes. STRUCTURE analysis of all variants revealed the majority of our samples were assignable to a single species, but with several highly admixed individuals. When using drought-associated variants, the same individuals exhibited less admixture and their allele frequencies were more polarized between Engelmann and scrub oaks than when using the total gene set. These findings are consistent with the hypothesis that selection may act differently on functional genes, such as drought-associated genes, and point to candidate genes that are suggestive of divergent selection among species maintaining adaptive differences. For example, the drought genes that showed the strongest bias against engelmannii-fixed oak variants in scrub oaks were related to sugar transporter, coumarate-coA ligases, glutathione S-conjugation, and stress response.
conclusionThis pilot study illustrates that whole transcriptomes of individuals will provide useful data for identifying functional genes that contribute to adaptive divergence among hybridizing species.
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