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Resistance

Resistance to Race 0 of Phytophthora parasitica var. nicotianae in Tissue Cultures of a Tobacco Breeding Line with Black Shank Resistance Derived from Nicotiana longiflora. Dale M. Maronek, Department of Horticulture and Plant Pathology, University of Kentucky, Lexington, KY 40506; James W. Hendrix, Department of Horticulture and Plant Pathology, University of Kentucky, Lexington, KY 40506. Phytopathology 68:233-234. Accepted for publication 20 July 1977. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-233.

Tissue cultures derived from stems of tobacco (Nicotiana tabacum) plants either susceptible to races 0 and 1 of Phytophthora parasitica var. nicotianae ‘Burley 21’ or with resistance to race 0 derived from N. longiflora ‘L8’ were inoculated with race 0 or 1 of the pathogen. Tissue cultures derived from Burley 21 plants were susceptible to both races, whereas cultures derived from L8 plants were resistant to race 0 and susceptible to race 1. These results correlate with the reactions of stems or roots of these cultivars to races 0 and 1 and provide further evidence of the similarity of black shank resistance of N. longiflora and N. plumbaginifolia.