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Rice yellow mottle virus (RYMV) is one of the most important disease affecting rice production in Africa. This research aimed to estimate the effect of RYMV disease on some yield-related traits in Korean rice germplasm recently introduced into Ghana and identify new sources of RYMV resistance for use in breeding. One hundred and seventy-six (176) rice genotypes including two highly resistant and a susceptible check, were used for this research. The experiment was laid in 4 × 44 lattice design with four replications in RYMV inoculated and non-RYMV inoculated environments in a screen house at CSIR-Crops Research Institute (CRI), Fumesua, Ghana, in 2019. The non- RYMV inoculated environment served as a control. Significant positive correlations were observed between disease severity and percentage grain yield reduction. RYMV reduced the culm length, tiller number, plant height, panicle number, biomass, and grain yield. The first five principal components explained 92.39% of the variation in the germplasm, with panicle number, tiller number, heading date, grain yield/plant and disease severity being the main discriminatory traits. The biplot indicated that genotypes 8261112 and 8261119, together with Gigante and Tog7291 (resistant checks), were the least impacted by the disease. We identified four main clusters from the hierarchical cluster analysis. Five highly resistant and 10 resistant genotypes were identified. The newly identified resistant genotypes will be used in breeding for resistance to RYMVdisease in Africa.
Amadu et al. (Fri,) studied this question.