Analysis of Resistance to Blast Isolates and Mapping of Rice Blast Resistance Gene in T2

To understand the genetic mechanisms of space-induced rice mutants′resistance to blast,T2,an in-dica rice mutant from Taihang 68,was researched in this study.Resistant spectrum,genetic analysis and gene map-ping were applied in this study.It was found that T2 conferred broader resistance spectrum than most of main culti-vars from Guangdong Province.By genetic analysis,the R gene was controlled by a single dominant gene,temporari-ly designed as PiTH gene,which was further mapped between T5 and K10 on chromosome 1 1 using SSR and InDel markers.PiTH might be a novel resistance gene in the Pik cluster,which conditioned differential reactions against many isolates and contained higher resistance.