Two genomic regions contribute disproportionately to geographic differentiation in wild barley

Zhou Fang; Ana M Gonzales; Michael T Clegg; Kevin P Smith; Gary J Muehlbauer; Brian J Steffenson; Peter L Morrell

doi:10.1534/g3.114.010561

Two genomic regions contribute disproportionately to geographic differentiation in wild barley

G3 (Bethesda). 2014 Apr 22;4(7):1193-203. doi: 10.1534/g3.114.010561.

Authors

Zhou Fang¹, Ana M Gonzales², Michael T Clegg³, Kevin P Smith², Gary J Muehlbauer¹, Brian J Steffenson⁴, Peter L Morrell⁵

Affiliations

¹ Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108 Department of Plant Biology, University of Minnesota, St. Paul, Minnesota 55108.
² Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108.
³ Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697.
⁴ Department of Plant Pathology, University of Minnesota, St. Paul, Minnesota 55108.
⁵ Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108 pmorrell@umn.edu.

Abstract

Genetic differentiation in natural populations is driven by geographic distance and by ecological or physical features within and between natural habitats that reduce migration. The primary population structure in wild barley differentiates populations east and west of the Zagros Mountains. Genetic differentiation between eastern and western populations is uneven across the genome and is greatest on linkage groups 2H and 5H. Genetic markers in these two regions demonstrate the largest difference in frequency between the primary populations and have the highest informativeness for assignment to each population. Previous cytological and genetic studies suggest there are chromosomal structural rearrangements (inversions or translocations) in these genomic regions. Environmental association analyses identified an association with both temperature and precipitation variables on 2H and with precipitation variables on 5H.

Keywords: chromosome structural variation; environmental association; local adaptation; population structure; wild barley.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Environment
Genetic Variation
Genetics, Population
Genome, Plant*
Genotype
Haplotypes
Hordeum / genetics*
Polymorphism, Single Nucleotide
Principal Component Analysis
RNA / chemistry
RNA / metabolism
Sequence Analysis, RNA

Substances

RNA