Genetic diversity analysis of sub-Saharan Africa (O. glaberrima) rice germplasm using microsatellite markers
2008
Adorada, D.L., International Rice Research Inst., DAPO Box 7777, Metro Manila 1301 (Philippines) | Athanson, B. | Gregorio,G.B., IRRI c/o International Inst. for Tropical Agriculture, Oyo Road PMB 5320, Ibadan (Nigeria)
Understanding the genetic diversity and population structure of germplasm collections is an important foundation for crop improvement. In this study 114 rice accessions from the IRRI germplasm collection, including 102 from sub-Saharan Africa (SSA) countries and 12 from Asian countries were characterized using 65 microsatellite markers. They were also evaluated for their reactions to soil stresses including salinity. Fe toxicity, Zn deficiency, and rice blast disease. A total of 437 alleles were detected at the 65 simple sequence repeat loci, with a average of 6.72 alleles perlocus across all accessions, and an average polymorphism information content value of 0.55. Cluster analysis revealed a narrow genetic diversity among SSA germplasm, with germplasm clusters either from SSA or from Asia and a very distinct cluster of SSA accessions coming from Senegal. The Senegal accession cluster was moderately tolerant to tolerant of Fe toxic condition, demonstrating that population groups identified solely based on molecular marker analysis may also have distinct phenotypic characteristics. This germplasm presents a valuable source of diversity for future breeding and association mapping efforts.
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