Genetic Diversity, Population Structure, and Linkage Disequilibrium in Bread Wheat (Triticum aestivum L.)

Abstract

Bread wheat (Triticum aestivum L.) gene pool was analyzed with 117 microsatellite markers scattered throughout A, B, and D genomes. Ninety microsatellite markers were giving 1620 polymorphic alleles in 55 different bread wheat genotypes. These genotypes were found to be divided into three subgroups based on Bayesian model and Principal component analysis. The highest polymorphism information content value for the markers resides on A genome was estimated for wmc262 marker located on 4A chromosome with the polymorphism information content value of 0.960. The highest polymorphism information content value (0.954) among the markers known to be located on B genome was realized for wmc44 marker located on 1B chromosome. The highest polymorphism information content value for the markers specific to D genome was found in gwm174 marker located on 5D chromosome with the polymorphism information content value of 0.948. The presence of linkage disequilibrium between 81 pairwise SSR markers reside on the same chromosome was tested and very limited linkage disequilibrium was observed. The results confirmed that the most distant genotype pairs were as follows Ceyhan-99-Behoth 6, Gerek 79-Douma 40989, and Karahan-99-Douma 48114.

Association analysis for agronomic traits in wheat under terminal heat stress

“…Three methods viz., population structure, cluster analysis and principal coordinate analysis consistently led this grouping. Consistency of grouping using these three methods has also been reported earlier ( Ya et al, 2017 ; Tascioglu et al, 2016 ). Population structure differentiation is based on relatedness frequency of accessions to each group as hypothesized by STRUCTURE.…”

Genetic Diversity, Population Structure and Relationship of Ethiopian Barley (Hordeum vulgare L.) Landraces as reveled by Simple Sequence Repeat (SSR) Markers

“…STRUCTURE, UPGMA clustering, and Discriminant analysis of principal component (DAPC) or PCoA; consistently recovered the same seven groups. The consistency of grouping using these methods has also been observed in earlier studies on different crop species (Tascioglu et al, 2016;Ya et al, 2017;Ketema et al, 2020). The differentiation of the population into different subpopulations by fastSTRUCTURE is based on frequencies of relatedness of the genotypes to each of the subpopulations as hypothesized (Nielsen et al, 2014;Chao et al, 2010).…”

Genetic Diversity and Population Structure in Türkiye Bread Wheat Genotypes Revealed by Simple Sequence Repeats (SSR) Markers

“…Collection, conservation and management of genetic resources are key issues in sustainable agriculture development [ 47 ]. Assessing levels and patterns of genetic diversity allows accurate classification of species and identification of individuals with desirable traits [ 48 ]. Existing genetic resources, their geographic location and relationships are commonly used to determine population diversity [ 49 ].…”