FIGURE 2.
Artificial hybridization-introgression for genetic improvement of Oryza sativa. O. sativa group was descent from Oryza rufipogon and Oryza nivara. Species of Oryza genus including O. rufipogon and O. nivara are rich in genetic diversity and favorable traits/alleles. Some elite genes/alleles were transferred into Asian cultivated rice and gained several breakthroughs in rice breeding. Further hybridization-introgression among interspecies and inter-subgroups will provide more chances to enlarge genetic diversity and gain breeding achievements in O. sativa.