Genetic Diversity and Population Structure of Barley Cultivars Released in Turkey and Bulgaria using iPBS-retrotransposon and SCoT markers

Abstract

To improve quantitative traits, it is essential to acknowledge genetic structure and diversity of the crop plants. In this study, 54 barley cultivars released from 1963 to date by different institutes in both Turkey and Bulgaria were screened with 18 iPBS and four SCoT markers to evaluate population structure and genetic diversity. According to the results, while total polymorphic band numbers was identified as 560, the polymorphic ones were found as 530 (438 and 92 amplified bands for iPBS and SCoT markers, respectively). In addition, the average polymorphic band number was found as 24.09. While the average polymorphism information content (PIC) value was 0.48, the average PIC value was 0.48 for iPBS and 0.48 for SCoT markers. The highest PIC value was determined as 0.50. The highest effective number of alleles, Shannon’s information index, and Nei’s genetic diversity were detected from the iPBS2271 marker at 1.61, 0.52 and 0.35, respectively among the iPBS markers while the highest values were obtained from SCoT-71 marker as 1.55, 0.32 and 0.48, respectively. As a result of a distribution of the 530 amplified bands in 54 barley cultivars, structure analysis showed that the subpopulations in the barley cultivars as a value of k=5. The average expected heterozygosity and fixation indices were identified as 0.234 and 0.322, respectively. Based on DICE similarity index, Martı and Zahir cultivars were found the most similar barley cultivars with 75% genetic similarity, whereas Özdemir and Karatay 94 and Tosunpaşa and Konevi cultivars were found 73% similar. On the other hand, Bayrak and Avcı-2002 were found the most diverse cultivars with 19.9% genetic similarity. As a result, the barley cultivars released in Turkey and Bulgaria were found varying and, the genetic diversity and statistics index analysis indicated that iPBS and SCoT markers are powerful markers to perform genetic diversity analysis.

Keywords

• Barley
• genetic diversity
• iPBS-retrotransposons
• SCoT marker
• structure analysis

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