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- Title
Identification of a second major resistance gene to Rice yellow mottle virus, RYMV2, in the African cultivated rice species, O. glaberrima.
- Authors
Thiémélé, Deless; Boisnard, Arnaud; Ndjiondjop, Marie-Noëlle; Chéron, Sophie; Séré, Yacouba; Aké, Séverin; Ghesquière, Alain; Albar, Laurence
- Abstract
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. glaberrima to 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.
- Subjects
AFRICA; RICE tungro spherical virus; RICE genetics; VIRAL genetics; GENE frequency
- Publication
Theoretical & Applied Genetics, 2010, Vol 121, Issue 1, p169
- ISSN
0040-5752
- Publication type
Article
- DOI
10.1007/s00122-010-1300-2