Table 5.

Pairwise population differentiation according to groups of populations as measured by F st

Populationsa	1	2	3	4	5	6
1	0.000
2	0.029 ns	0.000
3	0.049 ns	0.038 ns	0.000
4	0.254**	0.233*	0.258**	0.000
5	0.089*	0.153**	0.142**	0.349**	0.000
6	0.093*	0.143**	0.180**	0.346**	0.035 ns	0.000

^a 1)Thai improved cultivars, 2)Thai breeding lines, 3)Thai landraces, 4) The other Oryz a species 5)IRRI improved cultivars, and 6) IRRI breeding lines.

** Significant at P < 0.001, * Significant at P < 0.05, ^ns Not Significant.