Abstract
Two dominant genes conferring complete resistance to specific isolates of the rice blast fungus, Pyricularia grisea Sacc., were located on the molecular map of rice in this study. Pi-l(t) is a blast resistance gene derived from the cultivar ‘LAC23’. Its map location was determined using a pair of nearly isogenic lines (NILs) and a B6F3 segregating population from which the isoline was derived. RFLP analysis showed that Pi-l(t) is located near the end of chromosome 11, linked to RZ536 at a distance of 14.0±4.5 centiMorgans (cM). A second gene, derived from the cultivar ‘Apura’, was mapped using a rice doubled-haploid (DH) population. This gene was located on chromosome 12, flanked by RG457 and RG869, at a distance of 13.5+-4.3 cM and 17.7+-4.5 cM, respectively. The newly mapped gene on chromosome 12 may be allelic or closely linked toPi-ta. (=Pi-4(t)), a gene derived from Tetep that was previously reported to be linked to RG869 at a distance of 15.4±4.7 cM. The usefulness of markers linked to blast resistance genes will be discussed in the context of breeding for durable blast resistance.
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Yu, Z.H., Mackill, D.J., Bonman, J.M. et al. Molecular mapping of genes for resistance to rice blast (Pyricularia grisea Sacc.). Theoret. Appl. Genetics 93, 859–863 (1996). https://doi.org/10.1007/BF00224086
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DOI: https://doi.org/10.1007/BF00224086