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Resistance to Rice yellow mottle virus in rice germplasm in Madagascar

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Abstract

Rice yellow mottle virus (RYMV) is a recent and major threat to rice production in Madagascar. A large scale screening of resistance to RYMV in rice germplasm in Madagascar was conducted by visual symptom scoring and virus-assessment through ELISA tests. The response to virus inoculation of 503 local or introduced rice accessions was assessed. Most of them were susceptible to RYMV. A few cultivars expressed partial resistance at a level similar to the partially resistant Oryza sativa japonica cv. Azucena. Only one O. sativa cultivar expressed high resistance characterised by a lack of symptoms and an undetectable level of virus. It was a Malagasy traditional indica cultivar, named Bekarosaka, which originated from the northwest of the country. It was selected by farmers for its field resistance to RYMV. The response of cv. Bekarosaka to four pathotypes of RYMV was similar to that of cv. Gigante, the only other highly resistant indica cultivar. The sequence of the middle domain of the eIF(iso)4G, the genetic determinant of Rymv1 resistance on chromosome 4, of cv. Bekarosaka was similar to that of cv. Gigante. Subsequently, cvs Bekarosaka and Gigante probably carried the same resistance allele Rymv1-2. Rymv1-2 resistance was efficient against isolates of the major strains of RYMV, but was readily overcome by a pathotype from the northwest of Madagascar.

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Acknowledgements

We thank J. Aribi for technical assistance, E. Hébrard and N. Poulicard for helpful discussions, and J. M. Thresh for constructive criticisms of the manuscript. Funding by SIST and by the ECOGER action of the French National Programme ANR ‘Ecosphère continentale: processus, modélisation et risques environnementaux’ supported by INRA is acknowledged.

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Authors and Affiliations

  1. FOFIFA, BP 289, Mahajanga, 401, Madagascar

    M. Rakotomalala

  2. UMR RPB, IRD, BP 64501, 34394, Montpellier Cedex 5, France

    A. Pinel-Galzi & D. Fargette

  3. UMR GDP, IRD, BP 64501, 34394, Montpellier Cedex 5, France

    L. Albar & A. Ghesquière

  4. Direction Générale, FOFIFA, BP 1690, Antananarivo, 101, Madagascar

    Y. Rabenantoandro

  5. Faculté des Sciences, Département de Biologie et Ecologie Végétale, Université d’Antananarivo, BP 906, Antananarivo, 101, Madagascar

    P. Ramavovololona

Authors
  1. M. Rakotomalala
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  2. A. Pinel-Galzi
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  3. L. Albar
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  4. A. Ghesquière
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  5. Y. Rabenantoandro
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  6. P. Ramavovololona
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  7. D. Fargette
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Correspondence to D. Fargette.

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Rakotomalala, M., Pinel-Galzi, A., Albar, L. et al. Resistance to Rice yellow mottle virus in rice germplasm in Madagascar. Eur J Plant Pathol 122, 277–286 (2008). https://doi.org/10.1007/s10658-008-9282-5

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  • DOI: https://doi.org/10.1007/s10658-008-9282-5

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