Molecular characterization of the wild relatives of wheat using CAAT-box derived polymorphism

Abstract

A molecular assessment of genetic diversity was performed on a set of 228 selected accessions belonging to the different Aegilops and Triticum species using CAAT-box derived polymorphism (CBDP) markers. Fifteen CBDP primers generated 141 polymorphic fragments with an average of 9.40 per primer. The average of polymorphic information content and resolving power revealed a high efficiency of CBDP markers in analyzing genetic diversity among different wheat genotypes. The diversity indexes including polymorphic loci percent, number of observed and effective alleles, Shannon’s index and gene diversity among different populations were 76.24%, 1.67, 1.49, 0.42 and 0.28, respectively. These essentially coincided with the analysis of molecular variance results, indicating that 86, 68, and 59.46% of genetic variation were found within two Aegilops and Triticum genera and their populations, respectively. Genetic relationships inferred from cluster analysis was matched with STRUCTURE analysis, disclosing the accessions were grouped based on their genomic constitution. Furthermore, these results were confirmed by principal coordinate analysis (PCoA). Taken together, our results suggest that CBDP markers will be useful for genetic diversity assessment in the domesticated and wild relatives of wheat.

Keywords:

• Wheat germplasm
• genetic diversity
• CBDP polymorphisms
• gene flow
• population structure

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Erratum

Acknowledgement

The authors acknowledge with thanks the technical and lab facilities support from the Plant Biotechnology Research Center of Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.