Near-isogenic lines for resistance to brown planthopper with the genetic background of Indica Group elite rice (Oryza sativa L.) variety 'IR64'

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  • Kamal Md. Mostofa
    The United Graduate School of Agricultural Sciences, Kagoshima University Agrotechnology Discipline, Khulna University
  • Nguyen Cuong Dinh
    The United Graduate School of Agricultural Sciences, Kagoshima University Biotechnology Department, College of Food Industry
  • Sanada-Morimura Sachiyo
    Agro-Enviroment Research Division, Kyushu Okinawa Agricultural Research Center, NARO
  • Zheng Shao-Hui
    Faculty of Agriculture, Saga University
  • Fujita Daisuke
    Faculty of Agriculture, Saga University

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

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

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