NDLI: Fine-scale environmental variation contributes to introgression in a three-species spruce hybrid complex

Content Provider	Springer Nature Link
Author	Hamilton, Jill A. Torre, Amanda R. Aitken, Sally N.
Copyright Year	2014
Abstract	Hybridization is common for many forest trees, where weak barriers to reproduction obscure species boundaries. We characterized the genomic structure of Picea populations comprising three species spanning two well-known contact zones, the Picea sitchensis × Picea glauca and the P. engelmannii × P. glauca hybrid zones, using a set of 71 candidate-gene single nucleotide polymorphisms. The genetic structure of populations suggests a complex genomic architecture shaped by interspecific gene flow and strong environmental selection, with increased genetic diversity in hybrids. The presence of admixture among all three species suggests that three-way hybrids with mixed ancestry occur where species ranges overlap in transitional environments. Significant clinal variation and associations with climatic variables (including continentality, temperature, and precipitation) differ between hybrid zones, indicating that individual species and their hybrids are adapted to distinct environmental niches. Allele–environmental association analysis revealed that most of the candidate genes with evidence of selection were unique to either the Sitka × white or the Engelmann × white hybrid zones, with few shared between these zones. Management of these widespread and diverse gene pools will be best served through development of climate-based seed transfer, with recommended seed sources informed by a combination of genetic and climatic information for future climates.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	16142942
Journal	Tree Genetics & Genomes
Volume Number	11
Issue Number	1
e-ISSN	16142950
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-11-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spruce Admixture Hybrid zones Climate change Local adaptation Forestry Plant Genetics & Genomics Plant Breeding/Biotechnology Tree Biology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Molecular Biology Horticulture Forestry

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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