Virulence adaptation in a rice leafhopper: Exposure to ineffective genes compromises pyramided resistance

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dc.creatorHorgan, Finbarr G.
dc.creatorBernal, Carmencita C.
dc.creatorVu, Quynh
dc.creatorAlmazan, Maria Liberty P.
dc.creatorRamal, Angelee Fame
dc.creatorYasui, Hideshi
dc.creatorFujita, Daisuke
dc.date2018-11
dc.date2024-12-19T12:54:18Z
dc.date2024-12-19T12:54:18Z
dc.date.accessioned2026-06-27T04:14:19Z
dc.descriptionPyramiding resistance genes is predicted to increase the durability of resistant rice varieties against phloem-feeding herbivores. We examined responses by the green leafhopper, Nephotettix virescens (Hemiptera: Cicadellidae), to near-isogenic rice lines with zero, one and two resistance genes. The recurrent parent (T65) and monogenic lines (GRH2-NIL and GRH4-NIL) with genes for resistance to the green rice leafhopper, Nephotettix cincticeps (Hemiptera: Cicadellidae), were susceptible to the green leafhopper, but the pyramided line (GRH2/GRH4-PYL) was highly resistant to the green leafhopper. We selected green leafhoppers, N. virescens, from five sites in the Philippines for over 20 generations on each of the four lines. Populations selected on GRH2/GRH4-PYL gained partial virulence (feeding and development equal to that on T65) to the pyramided line within 10 generations and complete virulence (egg-laying equal to that on T65) within 20 generations. After 20 generations of rearing on the susceptible monogenic lines, green leafhoppers were also capable of developing and laying eggs on GRH2/GRH4-PYL. Furthermore, green leafhoppers reared on the susceptible GRH4-NIL for 20 generations showed equal preferences for T65 and GRH2/GRH4-PYL in choice bioassays. Our results indicate that previous long-term exposure to ineffective genes (including unperceived resistance genes) could dramatically reduce the durability of pyramided resistance. We suggest that informed crop management and deployment strategies should be developed to accompany rice lines with pyramided resistance and avoid the build-up of virulent herbivore populations.
dc.identifierhttps://hdl.handle.net/10568/164777
dc.identifier.urihttp://hdl.handle.net/123456789/26146
dc.languageen
dc.publisherElsevier
dc.rightsOpen Access
dc.sourceHorgan, Finbarr G.; Bernal, Carmencita C.; Vu, Quynh; Almazan, Maria Liberty P.; Ramal, Angelee Fame; Yasui, Hideshi and Fujita, Daisuke. 2018. Virulence adaptation in a rice leafhopper: Exposure to ineffective genes compromises pyramided resistance. Crop Protection, Volume 113 p. 40-47
dc.subjectbioassays
dc.subjectcrop management
dc.subjectdisease resistance
dc.subjectgenetic markers
dc.subjectintegrated pest management
dc.subjectpathogenicity
dc.subjectpesticide resistance
dc.subjectplant breeding
dc.subjectplant protection
dc.titleVirulence adaptation in a rice leafhopper: Exposure to ineffective genes compromises pyramided resistance
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)