Two allelic genes Pita and Pita-2 were initially identified on
chromosome 12 in japonica cultivars (Rybka et al. 1997) and
an indica cultivar Tadukan was indicated as the probable
ancestor for the Pita and Pita-2 genes (Bryan et al. 2000).
However, in this investigation, a new blast resistance gene has
been identified in this cultivar, which mapped on rice
chromosome 11. Tadukan was known to carry many resistance
genes against different blast isolates (Ou 1985) and this is
supported by the present observations