INHERITANCE AND ALLELIC RELATIONSHIPS BETWEEN GENES CONFERRING RESISTANCE TO XANTHOMONAS CAMPESTRIS PV. ORYZAE (ISHIYAMA) DYE IN RICE (ORYZA SATIVA L.)

Abstract

The inheritance of resistance to a pathotype IX05 collected from north western India was studied in three lines of rice B 76, ARC 10464 and CNGS 20083. These lines were crossed to a susceptible cultivar Taichung Native 1 to generate Fl, F2 and F3 generations. The' reaction of Fl and segregation pattern in F2 and F3 generations suggest that the resistance of B 76 and CNGS 20083 was conditioned by a dominant and a recessive gene respectively. Breeding lines ARC 10464 carried two independently inherited dominant genes. Since the F2 generations obtained from intercrosses of these three lines segregated for susceptible plants it is concluded that B 76, ARC 10464 and CNGS 20083 have different genes conferring resistance to pathotype IXC5 of X. c. pv. oryzae.