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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Identification of a second major resistance gene to Rice yellow mottle virus, RYMV2, in the African cultivated rice species, O. glaberrima
Theoretical and Applied Genetics, Volume 121, No. 1, Year 2010
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Description
Rice yellow mottle virus (RYMV) is the most damaging rice-infecting virus in Africa. However, few sources of high resistance and only a single major resistance gene, RYMV1, are known to date. We screened a large representative collection of African cultivated rice (Oryza glaberrima) for RYMV resistance. Whereas high resistance is known to be very rare in Asian cultivated rice (Oryza sativa), we identified 29 (8%) highly resistant accessions in O. glaberrima. The MIF4G domain of RYMV1 was sequenced in these accessions. Some accessions possessed the rymv1-3 or rymv1-4 recessive resistance alleles previously described in O. glaberrima Tog5681 and Tog5672, respectively, and a new allele, rymv1-5, was identified, thereby increasing the number of resistance alleles in O. glaberrimato three. In contrast, only a single allele has been reported in O. sativa. Markers specific to the different alleles of the RYMV1 gene were developed for marker-assisted selection of resistant genotypes for disease management. In addition, the presence of the dominant susceptibility allele (Rymv1-1) in 15 resistant accessions suggests that their resistance is under different genetic control. An allelism test involving one of those accessions revealed a second major resistance gene, i. e., RYMV2. The diversity of resistance genes against RYMV in O. glaberrima species is discussed in relation to the diversification of the virus in Africa. © 2010 Springer-Verlag.
Authors & Co-Authors
Thiemele, D.
France, Perpignan
Université de Perpignan Via Domitia
Cote D'ivoire, Abidjan
Université de Cocody-abidjan
Boisnard, Arnaud
France, Perpignan
Université de Perpignan Via Domitia
United Kingdom, Sheffield
The University of Sheffield
Ndjiondjop, Marie Noëlle
Benin, Cotonou
Africa Rice Center Contonou
Chéron, Sophie
France, Perpignan
Université de Perpignan Via Domitia
Séré, Yacouba
Benin, Cotonou
Africa Rice Center Contonou
Aké, Sévérin
Cote D'ivoire, Abidjan
Université de Cocody-abidjan
Ghesquiére, Alain
France, Perpignan
Université de Perpignan Via Domitia
Albar, Laurence
France, Perpignan
Université de Perpignan Via Domitia
Statistics
Citations: 91
Authors: 8
Affiliations: 4
Identifiers
Doi:
10.1007/s00122-010-1300-2
ISSN:
00405752
Research Areas
Genetics And Genomics