Genetic basis of multiple resistance to the brown planthopper (Nilaparvata lugens Stal) and the green rice leafhopper (Nephotettix cincticeps Uhler) in the rice cultivar 'ASD7' (Oryza sativa L. ssp. indica)

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  • Van Mai Tan
    Plant Breeding Laboratory, Faculty of Agriculture, Graduate School, Kyushu University Present address: Center of International Plant Research Vietnam and Japan, Vietnam National University of Agriculture
  • Fujita Daisuke
    Plant Breeding Laboratory, Faculty of Agriculture, Graduate School, Kyushu University Global Human Resources Development Project, Faculty of Agriculture, Kyushu University Present address: Faculty of Agriculture, Saga University
  • Matsumura Masaya
    NARO Kyushu Okinawa Agricultural Research Center
  • Yoshimura Atsushi
    Plant Breeding Laboratory, Faculty of Agriculture, Graduate School, Kyushu University
  • Yasui Hideshi
    Plant Breeding Laboratory, Faculty of Agriculture, Graduate School, Kyushu University

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  • Genetic basis of multiple resistance to the brown planthopper (<i>Nilaparvata lugens</i> Stål) and the green rice leafhopper (<i>Nephotettix cincticeps</i> Uhler) in the rice cultivar ‘ASD7’ (<i>Oryza sativa</i> L. ssp. <i>indica</i>)

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The rice cultivar ASD7 (Oryza sativa L. ssp. indica) is resistant to the brown planthopper (BPH; Nilaparvata lugens Stål) and the green leafhopper (Nephotettix virescens Distant). Here, we analyzed multiple genetic resistance to BPH and the green rice leafhopper (GRH; Nephotettix cincticeps Uhler). Using two independent F2 populations derived from a cross between ASD7 and Taichung 65 (Oryza sativa ssp. japonica), we detected two QTLs (qBPH6 and qBPH12) for resistance to BPH and one QTL (qGRH5) for resistance to GRH. Linkage analysis in BC2F3 populations revealed that qBPH12 controlled resistance to BPH and co-segregated with SSR markers RM28466 and RM7376 in plants homozygous for the ASD7 allele at qBPH6. Plants homozygous for the ASD7 alleles at both QTLs showed a much faster antibiosis response to BPH than plants homozygous at only one of these QTLs. It revealed that epistatic interaction between qBPH6 and qBPH12 is the basis of resistance to BPH in ASD7. In addition, qGRH5 controlled resistance to GRH and co-segregated with SSR markers RM6082 and RM3381. qGRH5 is identical to GRH1. Thus, we clarified the genetic basis of multiple resistance of ASD7 to BPH and GRH.

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