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Background  Rice blast is the most serious disease afflicting rice and there is an urgent need for the use of disease resistance (R) genes in blast tolerance breeding programs.  Pb1  is classified as a quantitative resistance gene and it does not have fungal specificity.  Pb1 -mediated resistance develops in the latter stages of growth. However, some cultivars, such as Kanto209 (K209), cultivar name Satojiman, despite possessing  Pb1 , do not exert resistance to rice blast during the reproductive stage.    Results  We found that the expression of  WRKY45  gene downstream of  Pb1  was weakly induced by rice blast inoculation at the full heading stage in K209. Genetic analysis using the SNP-based Golden Gate assay of K209 crossing with Koshihikari Aichi SBL (KASBL) found at least four regions related to the resistance in the rice genome (Chr8, Chr9, Chr7, Chr11). Mapping of QTL related to Chr7 confirmed the existence of factors that were required for the resistance of  Pb1  in the 22 to 23 Mbp region of the rice genome.    Conclusion  We clarified how the K209 cultivar is vulnerable to the blast disease despite possessing  Pb1  and found the DNA marker responsible for the quantitative resistance of  Pb1 . We identified the QTL loci required for  Pb1 -mediated resistance to rice panicle blast.  Pb1  was negatively dependent on at least three QTLs, 7, 9 and 11, and positively dependent on one, QTL 8, in the K209 genome. This finding paves the way for creating a line to select optimal QTLs in order to make use of  Pb1 -mediated resistance more effectively.    Electronic supplementary material  The online version of this article (doi:10.1186/s12284-017-0175-0) contains supplementary material, which is available to authorized users.

Panicle blast 1 (Pb1) resistance is dependent on at least four QTLs in the rice genome