RESULTS
Identification of BB-resistant wild rice accessions and study
of inheritance of BB resistance. Eighteen accessions of O.
nivara were observed to be resistant to all seven virulent strains of
X. oryzae pv. oryzae, with an average lesion length of 1.6 to 3.8
cm in repeated inoculation tests under controlled conditions.
Inheritance of BB resistance in these wild rice accessions was
studied by crossing them with the BB-susceptible varieties TN1
and Samba Mahsuri. Among the F1s generated from the 18
crosses, 17 showed near-complete to partial spikelet sterility with
very little or no F2 seed set. The F1s derived from the cross IRGC