Rice yellow mottle virus (RYMV), an emerging sobemovirus, is the cause of one of the most devastating rice diseases in Africa. In Burkina Faso, yield losses up to 100% have been reported. As the large majority of cultivated rice varieties are susceptible to this virus, the main alternatives for the control of the disease are the use of genetic resistance and the chemical control of the insect vector.
Here, 84 rice germplasm from INERA collection were screened for RYMV resistance/tolerance in order to support the development of other alternatives for disease control. Screening against three RYMV isolates was performed in a greenhouse. Resistance to infection was evaluated by RYMV inoculation followed by symptom assessment and ELISA. Disease incidence and severity were recorded. Among 84 genotypes, only three (3.57%) [NIL 130, WAB 2098 R, NIL 16] was resistant and four (4.76 %) [Tog5672, Tog5674, Tog5681, and Tog7291] highly resistant to infection with RYMV. Seven teen genotypes (20.24%) were classified as moderately resistant, 55 (65.48%) as susceptible, and five (5.95%) as highly susceptible [IR 841, Bouake 189, FKR 55, FKR 42, BG 90-2].
The resistant genotypes identified are good candidates for a breeding program for RYMV-resistant cultivars. Moderate resistant genotypes could be used by producers in cultivation under integrated production systems.
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2022: 6.012
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