NDLI: Genetic structure of Quercus rubra L. and Quercus ellipsoidalis E. J. Hill populations at gene-based EST-SSR and nuclear SSR markers

Content Provider	Springer Nature Link
Author	Lind, Jennifer F. Gailing, Oliver
Copyright Year	2013
Abstract	Sympatric hybridizing oak species provide a model system for studying local adaptation. Disjunct populations of Quercus rubra L. and Quercus ellipsoidalis E. J. Hill at the northern edge of their distribution may harbor important reservoirs of adaptive genetic variation. Genic (expressed sequence tag- simple sequence repeat = EST-SSR) and non-genic nuclear microsatellite (nuclear SSR = nSSR) markers were used to estimate neutral and potentially adaptive genetic variation in these two supposedly interfertile oak species showing different adaptations to drought. Eleven populations of putative Q. rubra and Q. ellipsoidalis located in the Western Upper Peninsula of Michigan were characterized using seven EST-SSRs and eight nSSRs. Bayesian cluster analysis revealed two distinct groups corresponding to each species with evidence of low levels of potential introgression. A comparison of the genetic structure of adult trees and seedlings revealed no evidence for selection against hybrids. Overall, similar levels of genetic variation and differentiation between populations and species were found at both EST-SSRs and nSSRs indicating that most EST-SSRs chosen reflect neutral variation. Two loci, 3A05 (nSSR) and GOT021 (EST-SSR, putative histidine kinase 4-like), were identified as putative outlier loci between species showing largely reduced variation in Q. ellipsoidalis. Future analyses of an increased number of EST-SSRs located in functional genes will allow the identification of genes involved in the reproductive isolation between both species.
Starting Page	707
Ending Page	722
Page Count	16
File Format	PDF
ISSN	16142942
Journal	Tree Genetics & Genomes
Volume Number	9
Issue Number	3
e-ISSN	16142950
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	EST-SSRs Nuclear SSRs Oaks Genetic assignment 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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