Substitution mapping and characterization of brown planthopper resistance genes from indica rice variety, 'PTB33' (Oryza sativa L.)

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  • Nguyen Cuong Dinh
    The United Graduate School of Agricultural Sciences, Kagoshima University Biotechnology Department, College of Food Industry
  • Zheng Shao-Hui
    Faculty of Agriculture, Saga University
  • Sanada-Morimura Sachiyo
    Agro-Enviroment Research Division, Kyushu Okinawa Agricultural Research Center, NARO
  • Matsumura Masaya
    Division of Applied Entomology and Zoology, Central Region Agricultural Research Center, NARO
  • Yasui Hideshi
    Plant Breeding Laboratory, Faculty of Agriculture, Kyushu University
  • Fujita Daisuke
    Faculty of Agriculture, Saga University

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  • Substitution mapping and characterization of brown planthopper resistance genes from <i>indica</i> rice variety, ‘PTB33’ (<i>Oryza sativa</i> L.)

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<p>Rice (Oryza sativa L.) yield is severely reduced by the brown planthopper (BPH), Nilaparvata lugens Stål, in Asian countries. Increasing resistance in rice against BPH can mitigate yield loss. Previous reports indicated the presence of three BPH resistance genes, BPH2, BPH17-ptb, and BPH32, in durable resistant indica rice cultivar ‘PTB33’. However, several important questions remain unclear; the genetic locations of BPH resistance genes on rice chromosomes and how these genes confer resistance, especially with relationship to three major categories of resistance mechanisms; antibiosis, antixenosis or tolerance. In this study, locations of BPH2, BPH17-ptb, and BPH32 were delimited using chromosome segment substitution lines derived from crosses between ‘Taichung 65’ and near-isogenic lines for BPH2 (BPH2-NIL), BPH17-ptb (BPH17-ptb-NIL), and BPH32 (BPH32-NIL). BPH2 was delimited as approximately 247.5 kbp between RM28449 and ID-161-2 on chromosome 12. BPH17-ptb and BPH32 were located between RM1305 and RM6156 on chromosome 4 and RM508 and RM19341 on chromosome 6, respectively. The antibiosis, antixenosis, and tolerance were estimated by several tests using BPH2-NIL, BPH17-ptb-NIL, and BPH32-NIL. BPH2 and BPH17-ptb showed resistance to antibiosis and antixenosis, while BPH17-ptb and BPH32 showed tolerance. These results contribute to the development of durable BPH resistance lines using three resistance genes from ‘PTB33’.</p>

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