Evaluation of the resistance effectiveness of elite varieties and rice’s lines against bacterial leaf blight under semi-controlled and field conditions in Burkina Faso

Abstract

Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae is one of the major diseases that threat rice production in Burkina Faso. The use of resistant rice varieties is the most effective and economical control method. To contribute to the genetic control of rice against bacterial leaf blight, elites rice varieties including FKR19, FKR43, FKR45N, FKR47N and FKR49N, known to be resistant in artificial inoculation to African Xoo strains diversity, were assessed in field in Di and Bagré sites during the 2017, 2018 and 2019 wet seasons. Then, thirty rice’s lines containing one to five resistance genes, developed by IRRI, were inoculated by Xoo BAI3 strain, the more virulent strain from Burkina Faso. All varieties including those used as susceptible control, exhibited no BLB symptoms. Furthermore, the lines IRBB57 (Xa4 + xa5 + Xa21), IRBB60 (Xa4 + xa5 + xa13 + Xa21) and IRBB63 (xa3 + Xa7 + xa13) were more effective against BAI3 strain. Therefore, pyramid genes lines and elite varieties are excellent genotypes for improving the resistance of adopted and susceptible varieties against Xoo in Burkina Faso.