Data from: A novel resistance gene for bacterial blight in rice, Xa43(t) identified by GWAS and confirmed by QTL mapping using a bi-parental population

Bacterial blight (BB) caused by the Xanthomonas oryzae pv. oryzae (Xoo)
pathogen is a significant disease in most rice cultivation areas. The
disease is estimated to cause annual rice production losses of 20–30
percent throughout rice-growing countries in Asia. The discovery and
deployment of durable resistance genes for BB is an effective and
sustainable means of mitigating production losses. In this study QTL
analysis and fine mapping were performed using an F2 and a BC2F2
population derived from a cross with a new R-donor having broad spectrum
resistance to Korean BB races. The QTL qBB11 was identified by composite
interval mapping and explained 31.25% of the phenotypic variation (R2)
with LOD values of 43.44 harboring two SNP markers. The single major
R-gene was designated Xa43 (t). Through dissection of the target region we
were able to narrow the region to within 27.83–27.95 Mbp, a physical
interval of about 119-kb designated by the two flanking markers
IBb27os11_14 and S_BB11.ssr_9. Of nine ORFs in the target region two ORFs
revealed significantly different expression levels of the candidate genes.
From these results we developed a marker specific to this R-gene, which
will have utility for future BB resistance breeding and/or R-gene
pyramiding using marker assisted selection. Further characterization of
the R-gene would be helpful to enhance understanding of mechanisms of BB
resistance in rice.