The main
objective of this study was to combine KDML105 essential grain quality traits with BPH resistance from
the donor cultivar, ‘Rathu Heenati’. The linkage drag between Bph3 and Wxa alleles was successfully
broken by phenotypic and marker-assisted selections. All introgression line (ILs) developed in this study
showed a broad spectrum resistance against BPH populations in Thailand and had KDML105 grain quality
standards. Finally this study was revealed that the ILs can be directly developed into BPH resistant
varieties or can be used as genetic resources of BPH resistance to improve rice varieties with the Wxb
allele in rice breeding programs.