Abstract
Ethiopia is the center of origin and diversity for Arabica coffee with high morphological diversity between accessions as compared to commercial cultivars. Coffee germplasm collection and molecular characterization are crucial steps towards its conservation, breeding, and development of superior genotypes for various end uses. Hence, this study was initiated with the objective of studying the genetic diversity of Coffea arabica accessions collected from different regions of Ethiopia, using SSR markers. A total of 20 SSR markers were used to genotype 86 accessions and produced a total of 112 alleles, with an average of 5.6 alleles per locus. All the loci across the entire populations were found to be highly polymorphic with a mean of 0.6 PIC value. Average observed heterozygosity and allelic richness across all populations ranged from 0.22 to 0.27 and 3.52–4.26, with a mean of 2.43 and 3.97, respectively. AMOVA showed high variation within population based on geographical origin. The smaller Fst (0.037) observed indicates the presence of lower population genetic differentiation as a result of higher gene flow (Nm = 2.45) across populations and the lowest mean genetic distance (0.21) observed between populations. The UPGMA, PCoA, and structure analysis poorly grouped the individuals into distinct clusters indicating the presence of population admixture. The observed higher genetic variability in all populations indicates that the country has huge coffee genetic diversity which can be used for future coffee improvement. Our results revealed an unexploited highly diverse genetic resource particularly from Omo, Ilubabor, and Benchi Maji that should be considered in future coffee breeding program and germplasm conservation.
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Full passport data of the 86 coffee samples representing the 10 populations used in the present study is provided in Table 1. The other datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The study was conducted by financial support provided by Ethiopian Institute of Agricultural Research Institute, National Agricultural Biotechnology Research Center. The authors are grateful to the Ethiopian Biodiversity Institute for providing the coffee germplasm.
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This work was supported by grants from the Ethiopian Institute of Agricultural Research Institute, National Agricultural Biotechnology Research Center.
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Material preparation, data collection, and analysis were performed by GD and TD. The first draft of the manuscript was written by GD and all authors commented on previous versions of the manuscript. All authors participated in designing the experiment, interpreting the data, drafting and revising the manuscript and approved the final manuscript.
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Dida, G., Bantte, K. & Disasa, T. Molecular characterization of Arabica Coffee (Coffea arabica L.) germplasms and their contribution to biodiversity in Ethiopia. Plant Biotechnol Rep 15, 791–804 (2021). https://doi.org/10.1007/s11816-021-00721-1
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DOI: https://doi.org/10.1007/s11816-021-00721-1