title: Population structure and marker-trait association of salt tolerance in barley (Hordeum vulgare L.).
abstract: Association mapping is becoming an important tool for identifying alleles and loci responsible for dissecting highly complex traits in barley. This study describes the population structure and marker-trait association using general linear model (GLM) analysis on a site of 60 barley genotypes, evaluated in six salinity environments. Ninety-eight SSR and SNP alleles were employed for the construction of a framework genetic map. The genetic structure analysis of the collection turned out to consist of two major sub-populations, mainly comprising hulled and naked types. LD significantly varied among the barley chromosomes, suggesting that this factor may affect the resolution of association mapping for QTL located on different chromosomes. Numerous significant marker traits were associated in different regions of the barley genome controlling salt tolerance and related traits; among them, 46 QTLs were detected on 14 associated traits over the two years, with a major QTL controlling salt tolerance on 1H, 2H, 4H and 7H, which are important factors in improving barley's salt tolerance.
authors.affiliation: Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, 812-8581 Fukuoka, Japan; Field Crop Research Institute, Agricultural Research Center, 9 Gama St., Giza, Egypt.
authors.forename: Ammar
authors.initials: A
authors.lastname: Elakhdar
authors.affiliation: Faculty of Agriculture, Alexandria University, Aflaton St, 21545 Elshatby, Egypt.
authors.forename: Mohamed Abd
authors.initials: MA
authors.lastname: El-Sattar
authors.affiliation: Field Crop Research Institute, Agricultural Research Center, 9 Gama St., Giza, Egypt.
authors.forename: Khairy
authors.initials: K
authors.lastname: Amer
authors.affiliation: Faculty of Agriculture, Alexandria University, Aflaton St, 21545 Elshatby, Egypt.
authors.forename: Assma
authors.initials: A
authors.lastname: Rady
authors.affiliation: Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, 812-8581 Fukuoka, Japan. Electronic address: kumamaru@agr.kyushu-u.ac.jp.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Kumamaru
mesh_terms: D000483:Alleles; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D004534:Egypt; D005819:Genetic Markers / Q000235:genetics*; D014644:Genetic Variation / Q000235:genetics; D005838:Genotype; D001467:Hordeum / Q000235:genetics*; D016014:Linear Models; D015810:Linkage Disequilibrium; D010641:Phenotype; D011153:Population; D040641:Quantitative Trait Loci; D055049:Salt Tolerance / Q000235:genetics*; D012987:Soil / Q000737:chemistry
chemical_list: D005819:Genetic Markers; D012987:Soil
keywords: Barley; Marker–trait association; Population structure; Salt tolerance