Abstract
To detect the genetic variation and relationships among different Salvia ecotypes/species, the gene targeted CAAT box-derived polymorphism (CBDP) markers were employed in terms of their efficiency. In this study, 25 CBDP primers amplified a total of 323 different polymorphic fragments that discriminate all 26 Salvia ecotypes/species and produced an informative and differentiated dendrogram and population structure. The CBDP markers were found to be effective in Salvia genetic diversity estimation with regard to the averages polymorphism (100%), polymorphism information content (\(\hbox {PIC}=0.89\)), marker index (\(\hbox {MI}=4.5\)) and the effective multiplex ratio (\(\hbox {EMR}=5.01\)) which were higher than other reported markers on Salvia. The extent of heterozygosity (\(0.034{\le }H{\le }0.223\)) and Shannon index (\(0.042{\le }I{\le }0.278\)) indicated a high level of genetic variation among Salvia species. The species containing the highest basic chromosome number (\(\hbox {X}=12\)) revealed the highest values for the number of different (\(N_{\mathrm{a}}\)) and effective (\(N_{\mathrm{e}}\)) alleles, Shannon index (I), and heterozygosity (H). Additionally, the tetraploid species showed high values of \(N_{\mathrm{a}}\), \(N_{\mathrm{e}}\), I and H compared to the diploid species. Mean of gene differentiation (\(G_{\mathrm{st}}\)) among Salvia species was 0.792, and the estimation of gene flow (\(N_{\mathrm{m}}\)) was 0.13, indicating high genetic differentiation. Remarkably, similar results were obtained from the principal co-ordinate analysis (PCoA) as compared with the cluster analysis, in which all different Salvia species formed individual groups. In conclusion, because the CBDP markers are derived from the gene containing regions of the genome, consequently, the high genetic diversity among studied Salvia species would be more useful for crop improvement programmes, such as hybridization between species and QTL mapping. The potential of CBDPs for analysing the phylogeny and genetic diversity of Salvia species is another key result with practical implications.
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Authors thank the Genetics and Genomics Laboratory at Imam Khomeini International University for their assistance.
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Corresponding Editor: Manoj Prasad
Experimental design, S. Fabriki-Ourang; laboratory work, H. Karimi; statistical data analysis, H. Karimi; interpretation of results, writing the manuscript and critical revision: S. Fabriki-Ourang.
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Fabriki-Ourang, S., Karimi, H. Assessment of genetic diversity and relationships among Salvia species using gene targeted CAAT box-derived polymorphism markers. J Genet 98, 75 (2019). https://doi.org/10.1007/s12041-019-1121-2
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DOI: https://doi.org/10.1007/s12041-019-1121-2