Submitted to: American Phytopathology Society
Publication Type: Proceedings
Publication Acceptance Date: 7/5/2008
Publication Date: 7/26/2008
Citation: Liu, G., Jia, Y., Correa-Victoria, F., McClung, A.M. 2008. Identification of quantitative trait loci (QTLs) responsible for sheath blight resistance in rice using recombinant inbred line population of Lemont X Jasmine 85 [abstract]. American Phytopathology Society. 98:S92.
Technical Abstract: Rice sheath blight (RSB) caused by the soil borne pathogen Rhizoctonia solani, is one of the most destructive diseases of rice, causing severe losses in rice yield and quality annually. The major gene (s) governing the resistance to RSB have not been found in cultivated rice worldwide. However, rice cultivars with different resistance reactions to RSB have been well documented. In this study, the disease reactions of 250 F5 recombinant inbred lines (RILs) of the cross of Lemont'Jasmine 85 population to RSB were evaluated in greenhouses using both micro-chamber and mist chamber method. A genetic linkage map was constructed with 199 evenly distributed simple sequence repeat (SSR) markers. Eight and nine quantitative trait loci (QTLs) responsible to RSB resistance were identified using phenotypical data from micro-chamber and mist chamber method, respectively. More chromosomes harboring QTLs were identified using mist chamber (Chromosomes 1, 2, 3, 5, 6, 9, 10 and 12) than using micro-chamber (Chromosome 1, 3, 5, 6 and 9). Three QTLs on Chromosomes 1, 5 and 9 were consistently identified using both micro-chamber and mist chamber methods. One major QTL associated with RM245 was determined to contribute 18.2% of phenotypic variation in micro-chamber condition and of 22.8% in mist chamber condition. Field evaluation of these RILs to RSB will be performed in three locations (Arkansas, Louisiana and Texas), and the further QTL analysis will be taken place to confirm these QTLs.