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Detection and Serological Characterization of Rice Yellow Mottle Virus in Central African Republic

Agricultural Sciences 2016年第12期7卷 911-919页

作者： Régis Dimitri Sokpé Longué Innocent Zinga Silla Semballa Nicolas Barro Oumar Traoré Crop Production Department Institute of Environment and Agricultural Research Ouagadougou Burkina Faso Life Science Department University of Bangui Bangui Central African Republic Department of Biochemistry and Microbiology University of Ouagadougou I-Professor Joseph Ki-Zerbo Ouagadougou Burkina Faso

Serological and biological detection of Rice Yellow Mottle Virus (rymv) in leaf samples belonging from cultivated rice species and wild grasses revealed 201 positive detections. All these isolates occurred exclusively on cultivated rice species (Oryza sativa L. and O. glaberrima Steud). A relationship was found between cultural practices and presence of rymv in fields (X2 = 108.83, df = 1, P

关键词： rymv Detection Serological Characterization Central African Republic

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Pathogenic Variation and Occurrence of Multiple Resistance-Breaking <i>Rice yellow mottle virus</i>Strains in Tanzania

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American Journal of Plant Sciences 2017年第8期8卷 1820-1841页

作者： Judith Hubert Herman J. F. Lyimo Ashura Luzi-Kihupi Department of Crop Science and Horticulture Sokoine University of Agriculture Morogoro Tanzania

Rice yellow mottle virus (rymv) is a major biotic constraint for rice production in Africa. The resistance-breaking ability of Tanzanian rymv strains and phylotypes (S4lm (Tz526), S4lv (Tz516), S4ug (Tz508), S5 (Tz429, Tz445), S6c (Tz486) and S6w (Tz539)) were tested by inoculating rice cultivars with rymv1 resistant alleles (Gigante (rymv1-2), Tog12387 (rymv1-3), Tog5681 (rymv1-3), Tog5438 (rymv1-4), Tog5672 (rymv1-4+rymv2) and Tog5674 (rymv 1-5)) in a screen house. The results revealed multiple resistance-breaking strains and phylotypes on resistant cultivars Gigante, Tog12387, Tog5438 and Tog5681. However, the resistance breakdown was highly variable depending on the strain used, and disease severity ranged from 11% - 75.3%. The virulence potential of rymv phylotype S4lm (Tz526) was similar to phylotype S6w (Tz539). The impact of strains and phylotypes on yield and its components in rice cultivars revealed highly significant differences (P ≤ 0.001). The lowest percent plant height reduction (2.8%), number of tillers per plant (2.5%), 1000 grain weight (2.7%), spikelet sterility (3.5%) and yield (5%) was recorded in rice cultivar Gigante inoculated with rymv phylotype S6c (Tz486). Phylotype S6c (Tz486) despite being less virulent compared to other strains, its virus titer in rice cultivar Gigante (1.833) was higher than S5 (Tz429, Tz445) inoculated on Tog5674 (0.171, 0.207) and S6w (Tz539) inoculated on Tog5681 (0.283). The resistant-breaking strain S5 (Tz445) multiplied in resistant rice cultivar Tog5674 without inducing visible symptoms but showed positive reaction to ELISA with low virus titer. The strain S5 overcame wide range of resistant alleles including rymv1-2, rymv1-3, rymv1-4 and rymv1-5 resistance, with exception of rymv1-4 + rymv2. The current results gave a new perspective for future identification of resistance-breaking mutations through sequencing of the rymv genome in infected rice cultivars and mutagenesis of an infectious viral clone useful for

关键词： Pathogenic Variation Virulence Multiple Resistance-Breaking rymv Strains Yield Losses Tanzania

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