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By using a set of 315 recombinant inbred lines (RILs) from the cross Lemont (japonica)×Teqing (indica) and a complete linkage map with 186 well distributed RFLP markers and 3 morphological markers, a major gene (Xa4) and 10 QTLs and 9 pairs of epistasis loci conferring horizontal resistance to three strains of %Xanthomonas oryza% pv %oryza (Xoo)% were mapped. The Teqing allele at Xa4 on chromosome 11 acts as a dominant resistant gene against pathogen race CR4 and CX08, but as an additive QTL with a significantly (47%) reduced effect {against the} virulent strain, CR6. The major gene Xa4 exhibited stronger degree of race specificity. Most QTLs showed consistent levels of resistance against all three %Xoo% strains. The results suggest that a high level durable resistance to %Xoo% may be achieved by cumulative effects of multiple QTL.
By using a set of 315 recombinant in lines (RILs) from the cross Lemont (japonica) × Teqing (indica) and a complete linkage map with 186 RFLP markers and 3 morphological markers, a major gene (Xa4) and 10 QTLs and 9 pairs of epistasis loci conferring horizontal resistance to three strains of % Xanthomonas oryza % pv % oryza (Xoo) % were mapped. The Teqing allele at Xa4 on chromosome 11 acts as a dominant resistant gene against pathogen Most of the QTLs showed consistent levels of resistance (race Q4 with CX08, but as an additive QTL with a significant (47%) reduced effect {against the } virulent strain, CR6. The results suggest that a high level durable resistance to % Xoo % may be achieved by cumulative effects of multiple QTL.