Towards this
end, surveys have identified rice cultivars with one Pi-ta
haplotype that confers resistance and three pi-ta haplotypes
that confer susceptibility (Jia et al. 2003). Conserved poly-morphisms between the Pi-ta and pi-ta DNA sequences
allow the development of dominant and codominant markers
from portions of the Pi-tagene to be used in identification
and incorporation of the Pi-tagene in MAS