Resistance to the ShB pathogen
is quantitative in nature (Pinson et al. 2005) and 16
quality trait loci (QTLs) providing ShB resistance across
different genetic backgrounds have been identified in
different QTL mapping studies (Srinivasachary et al.
2011). qSBR11-1 is a major QTL that has been found to
be effective against the ShB pathogen consistently over
time and at different locations (Channamallikarjuna
et al. 2010).