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Physiology and Biochemistry

Effect of Sweet Potato Cultivars and Pathogens on Ipomeamarone Content of Diseased Tissue. W. J. Martin, Professor of Plant Pathology, Louisiana State University Agricultural Experiment Station, Baton Rouge, LA 70803; V. C. Hasling(2), E. A. Catalano(3), and H. P. Dupuy(4). (2)(3)(4)Chemists, respectively, U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, New Orleans, LA 70179. Phytopathology 68:863-865. Accepted for publication 18 November 1977. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-863.

Diseased tissue from the roots of 21 sweet potato cultivars that were inoculated artificially with each of three pathogens, Ceratocystis fimbriata, Sclerotium rolfsii, and Diplodia tubericola were analyzed for ipomeamarone content. The data from three replications of each cultivar-pathogen combination were analyzed statistically. Differences in ipomeamarone content were significant among cultivars (P = 0.01), among pathogens (P = 0.05), and for cultivar × pathogen interaction (P = 0.01). Weight of diseased tissue and amount of ipomeamarone (mg/g) were significantly correlated (P = 0.01) with D. tubericola (r = –0.47) and with S. rolfsii (r = –0.44), but not with C. fimbriata (r = +0.16). The diameter of lesions caused by C. fimbriata was not significantly correlated with amount of ipomeamarone (r = +0.12).