High-resolution mapping of , a gene from (Sharma et Shastry) conferring resistance to green rice leafhopper ( Uhler).

The green rice leafhopper (GRH), Uhler, is a major insect pest of cultivated rice, L., throughout the temperate regions of East Asia. GRH resistance had been reported in the wild species but genetic basis of GRH resistance in wild rice accession has not been clarified. Here, we found a major QTL, , on chromosome 4 conferred GRH resistance with 14.1 of the logarithm of odds (LOD) score explaining 67.6% of phenotypic variance in the BCF population derived from a cross between the susceptible cultivar 'Taichung 65' (T65) and accession IRGC105715. has been identified as between the markers RM5414 and C60248 in a BCF population derived from two BCF plants resistant to GRH. In a high-resolution mapping, the region was delimited between the markers G6-c60k and 7L16f, and corresponded to an 31.2-kbp region of the 'Nipponbare' genome. Understanding the genetic basis of GRH resistance will facilitate the use of GRH resistance genes in marker-assisted breeding in rice.