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Evaluation of resistance of USDA spinach germplasm to Stemphylium vesicarium
EP32865
Poster Title: Evaluation of resistance of USDA spinach germplasm to Stemphylium vesicarium
Submitted on 03 Aug 2020
Author(s): Bo Liu1, Gehendra Bhattarai2, Ainong Shi2, Chunda Feng1, and James C. Correll1,
Affiliations: 1 Dept. Plant Pathology, University of Arkansas, Fayetteville, AR 72701; 2 Horticulture Dept., University of Arkansas, Fayetteville, AR 72701
This poster was presented at APS anual meeting 2020
Poster Views: 117
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Poster Information
Abstract: Leaf spot disease of spinach, caused by Stemphylium vesicarium, can reduce yield and quality, and are a major constraint in spinach production in the U.S. Screening spinach germplasm to identify resistant material will be a critical component for disease management. A total of 148 USDA spinach lines and 169 commercial cultivars, including a subset of contemporary cultivars, were screened for disease severity by inoculating 34 to 39-day-old spinach plants with an isolate S. versicarium (Sb-1-St001) at a spore concentration of 1 x 106. Non-inoculated controls (Viroflay) were sprayed with distilled water and subjected to the same conditions. After inoculation, plants were incubated in a dew chamber for 48 h at 20 to 22°C. Plants were then transferred to the greenhouse (20 to 30°C) and disease severity was rated on scale of 0 to 4.0 from 7-16 days after inoculation. The disease severity (DS) scale used was 0 = no symptoms on leaves; 1 = 1 – 25% leaf area infected; 2 = 26 – 50% leaf area infected; 3 = 51 – 75% leaf area infected; 4 = 76 – 100% leaf area infected. Of the lines and cultivars tested, 35% were considered highly susceptible (DS = 4.0), 35% were susceptible (DS = 3.0-4.0), 17% were moderately resistant (DS = 2.0-3.0), and 14% were highly resistant (DS = 1.0-2.0). Phenotypic evaluation of the USDA germplasm and commercial cultivars identified a number of lines that were resistant and others that could be used to accelerate disease resistance breeding to Stemphylium leaf spot. Summary: Evaluation of resistance of USDA spinach germplasm to Stemphylium vesicarium. Phenotypic evaluation of the USDA germplasm and commercial cultivars identified a number of lines that were resistant and others that could be used to accelerate disease resistance breeding to Stemphylium leaf spot. References: du Toit, L.J., and Derie, M.L. 2001. Stemphylium botryosum pathogenic on spinach seed crops in Washington. Plant Dis. 85:920.
du Toit, L.J., and Hernandez-Perez, P. 2005. Efficacy of hot water and chlorine for eradication of Cladosporium variabile, Stemphylium botryosum, and Verticillium dahliae from spinach seed. Plant Dis. 89:1305-1312.
Liu, B., Stein, L.A., Cochran, K., du Toit, L., Feng, C.D., and Correll, J.C. 2020. Characterization of spinach leaf spot pathogens from several spinach production areas in the U.S. Plant Disease 104:1994-2004.
Villarroel-Zeballos, M.I., Feng, C.D. Iglesias, A., du Toit, L.J., and Correll, J.C. 2012. Screening for resistance to Verticillium wilt in spinach and isolation of Verticillium dahliae from seed of spinach accessions. HortScience 47:1297-1303.

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