than that of the tested rice germplasms obtained from IRRI. Our molecular analysis indicated that some of our cultivars were japonica rice, and genetic diversity is
present in this set of the available germplasms. Differentiation analysis indicated that groups of IRRI germplasm were significantly different from Thai groups. Thus, these
germplasm can be used to broaden the genetic base and trait improvements in rice breeding programs. Cluster and structure analyses showed concordant results having six distinct groups, and differentiation analysis supported that they were significantly different from each other.
The results also indicate that TGMS lines which could
be used as female parents were different from the other
groups making them good candidates used to create rice
hybrids having high yields. Genetic diversity and genetic
relationship among these germplasms will be useful for
parental line selection used in rice breeding programs
and in hybrid production.