Abstract
Genetic diversity of 35 Psidium guajava L. accessions and three related species (P. guineense Sw., P. sartorianum (O. Berg) Nied. and P. friedrichsthalianum (O. Berg) Nied.) maintained at the U.S. Department of Agriculture (USDA), National Plants Germplasm System, Hilo, HI, was characterized using 20 simple sequence repeat (SSR) markers. Diversity analysis detected a total of 178 alleles ranging from 4 to 16 alleles per locus. The observed mean heterozygosity (0.2) and inbreeding coefficient (0.8) indicated a high level of inbreeding among the accessions tested. Multi-locus DNA fingerprints based on the 20 SSR loci unambiguously differentiated all accessions and revealed the absence of duplicated samples. Ordination and cluster analyses suggested that the genetic relationships between majorities of the accessions could be explained by geographic origin, mainly including tropical America, Southeast Asia and Hawaii. A Bayesian cluster analysis partitioned the accessions into two groups and the partition was largely compatible with the result of ordination analyses. Distance-based cluster analyses further indicated that accessions from same geographical region or breeding programs grouped together in spite of the inter-regional exchange of germplasm. Accessions from Southeast Asia were dominantly white fleshed, whereas accessions from tropical America and Hawaii exhibited diverse flesh colors. The results also indicated that accessions from the same region were likely derived from a small number of common ancestors or progenitors. All 20 SSRs were transferable to P. guineense, P. sartorianum and P. friedrichsthalianum, indicating a close relationship between the cultigens and wild relatives. Application of SSR markers in the USDA/Agricultural Research Service germplasm collection provides new insight into the diversity of the guava germplasm, which will be valuable in future breeding endeavors and the conservation of guava genetic resources.
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Financial support of the USDA-CSREES through an award Agreement 2004-38814-15128 to The Fort Valley State University is greatly appreciated.
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Sitther, V., Zhang, D., Harris, D.L. et al. Genetic characterization of guava (Psidium guajava L.) germplasm in the United States using microsatellite markers. Genet Resour Crop Evol 61, 829–839 (2014). https://doi.org/10.1007/s10722-014-0078-5
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DOI: https://doi.org/10.1007/s10722-014-0078-5