Fig. 3.

Substitution mapping of a QTL controlling resistance to bacterial grain rot (BGR) on the long arm of chromosome 1 in recombinant BC₂F₇ lines. Each pair of lines (e.g., 1A and 1B) was identified from the progeny of a recombinant BC₂F₆ plant. Black bars indicate chromosome regions derived from Kele (resistant); white bars indicate chromosome regions derived from Hitomebore (susceptible). Positions are based on the International Rice Genome Sequencing Project (IRGSP) 1.0 pseudomolecules of the Nipponbare genome. The location of the candidate QTL (RBG2), indicated at the bottom, is based on the phenotypic data obtained in an inoculation test, tabulated on the right. The ratio of diseased spikelets (RDS) scores of the two lines in each pair was compared by using Student’s test. *P < 0.05; ns not significant, P > 0.05