Near-isogenic lines for resistance to brown planthopper with the genetic background of Indica Group elite rice (<i>Oryza sativa</i> L.) variety ‘IR64’

The brown planthopper (BPH), Nilaparvata lugens Stål, is an insect pest that severely damages rice (Oryza sativa L.) in Asia, causing huge yield loss. Use of resistant variety a cost-effective and eco-friendly strategy for maintaining BPH populations below the economic injury level. However, current have been changed to virulence against varieties. In this study, estimate effective combinations among eight resistance genes (BPH32, BPH17-ptb, BPH20, BPH17, BPH3, BPH25, BPH26 qBPH6), near-isogenic lines with genetic background Indica Group ‘IR64’ (IR64-NIL) were developed using marker-assisted selection. genome recoveries these NILs ranged from 89.3% 98.8% agronomic traits them similar those ‘IR64’. modified seed box screening test, level IR64-NILs was higher than antibiosis high adult mortalities (from 56.0% 97.0%) observed NILs, comparison Among IR64-NILs, line carrying BPH17 showed highest at all tests. Thus, multiple could be valuable breeding enhancing levels by gene pyramiding multiline variety.