Our results from the analysis of the 3 main rice groups showed that the other Oryza species had the highest genetic diversity, followed by Thai rice lines and IRRI germplasm. Similar to the study using Indian germplasm, the genetic diversity of the other Oryza species in this report is higher than that of the cultivated rice (Ram
et al. 2007). However, the genetic diversity of the other Oryza species used in this report (0.55) is higher than the genetic diversity of the 7 wild rice species (0.436)
reported by Ram et al. (2007). Our results indicated that Oryza brachyantha, No. 40, (FF genome) is the most divergent species among the other Oryza species, which is
also in agreement with reports from previous studies (Joshi et al. 2000, Jacquemin et al. 2009; Lu et al. 2009). Similarly, Oryza officinalis No. 42, (CC genome) and
Oryza latifolia No. 41, (CCDD genome) are grouped together, and separated from Oryza brachyantha, supporting that they are in the officinalis complex, including
diploid CC and tetraploid CCDD genomes(Joshi et al. 2000).