Abstract
Pi-z is a disease resistance gene that has been effectively used to combat a broad-spectrum of races of the rice blast fungus Magnaporthe grisea. Although DNA markers have been reported for selection of the Pi2(t) and Pi-z resistance genes at the Pi-z locus, markers that are more tightly linked to the Pi-z locus would benefit rapid and effective cultivar development. Analysis of the publicly available genome sequence of Nipponbare near the Pi-z locus revealed numerous SSRs that could be converted into markers. Three SSRs on rice PAC AP005659 were found to be very tightly linked to the Pi-z locus, with one marker, AP5659-3, co-segregating with the Pi-z resistance reaction. The Pi-z factor conferring resistance to two races of blast was mapped to a 57 kb region on the physical map of Nipponbare in a location where the Pi2(t) gene was physically mapped. Two SSR marker haplotypes were unique for cultivars carrying the Pi-z gene, which indicates these markers are useful for selection of resistance genes at the Pi-z locus in rice germplasm.
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Abbreviations
- SSR:
-
simple sequence repeat
- BAC/PAC:
-
bacterial/P1-derived artificial chromosome
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Fjellstrom, R., McClung, A.M. & Shank, A.R. SSR Markers Closely Linked to the Pi-z Locus are Useful for Selection of Blast Resistance in a Broad Array of Rice Germplasm. Mol Breeding 17, 149–157 (2006). https://doi.org/10.1007/s11032-005-4735-4
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DOI: https://doi.org/10.1007/s11032-005-4735-4