Journal
NEW PHYTOLOGIST
Volume 201, Issue 2, Pages 687-699Publisher
WILEY
DOI: 10.1111/nph.12540
Keywords
adaptive introgression; bounded hybrid superiority; breeding; climate change; exogenous selection
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Funding
- Genome British Columbia, Genome Canada
- Natural Science and Engineering Research Council of Canada (NSERC)
- BC Forest Genetics Council
- UBC University Graduate Fellowships (UGF)
- UBC Four Year Fellowship
- B.C. Government Pacific Century Graduate Scholarship
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The nature of selection responsible for the maintenance of the economically and ecologically important Picea glaucaxPicea engelmannii hybrid zone was investigated. Genomic, phenotypic and climatic data were used to test assumptions of hybrid zone maintenance and to model future scenarios under climate change. Genome-wide estimates of admixture based on a panel of 86 candidate gene single nucleotide polymorphisms were combined with long-term quantitative data on growth and survival (over 20yr), as well as one-time assessments of bud burst and bud set phenology, and cold hardiness traits. A total of 15498 individuals were phenotyped for growth and survival. Our results suggest that the P.glaucaxP.engelmannii hybrid zone is maintained by local adaptation to growing season length and snowpack (exogenous selection). Hybrids appeared to be fitter than pure species in intermediate environments, which fits expectations of the bounded hybrid superiority model of hybrid zone maintenance. Adaptive introgression from parental species has probably contributed to increased hybrid fitness in intermediate habitats. While P.engelmannii ancestry is higher than P.glauca ancestry in hybrid populations, on average, selective breeding in managed hybrid populations is shifting genomic composition towards P.glauca, potentially pre-adapting managed populations to warmer climates.
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