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Genetic diversity among isolates of Rhizoctonia solani and sources of resistance in Vicia faba



Genetic diversity among isolates of Rhizoctonia solani and sources of resistance in Vicia faba



Canadian Journal of Plant Pathology 15(1): 23-28



The virulence of nine isolates of Rhizoctonia solani (AG-2T2, AG-4, and AG-5) from Vicia faba on 20 V. faba genotypes of divers origin was investigated under controlled greenhouse conditions. Infested PDA discs were used as inoculum. A wide range of virulence was displayed among the R. solani isolates on the different faba bean genotypes. Isolates RS-5(AG-5) and RS-6 (AG-4) were the least virulent on most faba bean genotypes. Isolates RS-2 (AG-4), RS-12 (AG-4), RS-13 (AG-2T2), RS-20 (AG-2T2), RS-58(AG-4), and RS-59 (AG-2T2) were moderately virulent on 3-10 genotypes. Isolate RS-1 (AG-40 was highly virulent on all genotypes. A large number of faba bean accessions and cultivars were evaluated under field conditions for their reaction to R. solani isolates RS-12 and RS-58 (AG-4). A 1:1 mixture of proso millet seed infested with each of the two isolates was used as inoculum at the time of seeding. More than 60% of the plants were resistant to seed rot in 25 accessions, to seedling blight in 171 accessions, and to both diseases in 5 accessions. The percentages of plants resistant to seeding blight declined after each of three cycles of selection, selfing, and testing to isolate RS-58 under controlled conditions.

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Accession: 002390712

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DOI: 10.1080/07060669309500845


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