Author
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Strausbaugh, Carl |
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Eujayl, Imad |
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MARTIN, F - US Department Of Agriculture (USDA) |
Submitted to: Phytopathology
Publication Type: Abstract Only Publication Acceptance Date: 5/8/2015 Publication Date: 11/17/2015 Citation: Strausbaugh, C.A., Eujayl, I.A., Martin, F.N. 2015. Pathogenicity, vegetative compatibility, and genetic diversity in verticillium dahliae from sugar beet and historical strains. Phytopathology. 105:S4.132. Interpretive Summary: Technical Abstract: Verticillium wilt of sugar beet is a disease problem that has received very little attention in the literature, but has been reported to reduce sucrose production and purity. To improve our understanding of Verticillium wilt, a survey of sugar beet plants with wilt symptoms (leaves with yellow or necrotic vein delimited sectors) in Idaho was conducted in 2007 (5 roots from 40 fields; 200 roots total) and 2008 (5 roots from 45 fields; 225 roots total). Verticillium dahliae was isolated from all plants, while Fusarium oxysporum was also isolated from 19 and 21% of the plants in 2007 and 2008, respectively. From a collection of 109 V. dahliae sugar beet isolates, all isolates had the MAT1-2 mating type and 95% of isolates evaluated for vegetative compatibility group (VCG) were 4A (1, 1, and 3% were non-compatible, VCG 4B, and VCG 2B, respectively). All the VCG 4A isolates had the same mitochondrial haplotype based on sequencing from regions 3 (cox3 to nad6) and 5 (cox1 to rnl). In greenhouse pathogenicity tests on sugar beet cultivar Monohikari, the VCG 4A isolates produced more foliar symptoms (P < 0.0001) than VCG 1, 1A, 2A, 2B, 3, and 4B isolates, but none of the VCGs could consistently reduce root or top weight. |