European Journal of Biotechnology and Bioscience

Authors
Lincoln Mandal, Sunil Kumar Verma, Anil S Kotasthane, Satish B Verulkar

Abstract
Brown spot disease is widely distributed and known to cause yield losses in rice. The RIL lines along with parents were planted and evaluated following the standard evaluation system developed by IRRI for the brown spot tolerance. The RILs exhibited nearly normal distribution, which indicated that neither parent contained all the alleles for resistance or susceptibility. In this investigation, the genotypic and phenotypic data of 122 RIL population derived from a cross Danteshwari × Dagad deshi was used to identify QTLs for brown spot disease tolerance. A total of three QTLs, “qBS1.1”, “qBS5.1” and “qBS5.2” were mapped for brown spot tolerance on chromosomes 1, 5 and 5, respectively. The QTLs on chromosome 5 were identified with high phenotypic variance and not reported earlier, will be good candidates for fine mapping and positional cloning studies. The QTLs, “qBS5.1” and “qBS5.2” identified may be used in resistance breeding of brown spot tolerance.