GENETICS OF RESISTANCE TO XANTHOMONAS ORYZAE PV. ORYZAE (lSHIYAMA) DYE IN ORYZA SATIVA L.

Abstract

The inheritance of resistance and allelic relationships in three lines of rice, i.e. B 76, Kogyoku and CNGS 20083, was studied against pathotype Ix08 of Xanthomonas oryzae pv. oryzae, causing bacterial leaf blight (BLB). The resistance of line B76 is governed by single dominant gene. The cultivar Kogyoku has two independently inherited dominant genes for resistance.Asingle recessive gene confers resistance in lineCNGS20083. Studyof allelic relationships showed that genes for BLB resistance in the cultivarsllines B76, Kogyoku and CNGS 20083 are different. Crosses of the line B 76 with other genotypes having already known resistance genes demonstrated that B76 contains gene(s) which are different than Xal, Xa3, Xa Kg (Xa12), Xa6, Xa7 and Xall.