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Carbohydrate Accumulation and Depletion by Winter Cereals Differing in Resistance to Typhula idahoensis. R. K. Kiyomoto, Former Research Assistant, Department of Plant Pathology, Washington State University, Pullman, WA 99163, Present address of senior author: Del Monte Corporation, P.O. Box 36, San Leandro, CA 94577; G. W. Bruehl, Professor, Department of Plant Pathology, Washington State University, Pullman, WA 99163. Phytopathology 67:206-211. Accepted for publication 14 May 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-206.

The wheat selection C. I. 14106, which is resistant to Typhula idahoensis, accumulated available carbohydrates in its crown tissues early in the cold-hardening process; but resistant C. I. 9342, moderately resistant Moro, and susceptible Nugaines accumulated less carbohydrates and at a slower rate. Early acquisition of carbohydrate in the crown of C. I. 14106 was correlated with early acquisition of resistance. Moro and C. I. 9342 required longer periods of cold hardening to acquire carbohydrates and resistance. During incubation at 0.5 C in the dark, carbohydrate concentration declined in Nugaines at a faster rate than in C. I. 14106, C. I. 9342, or Moro. The F1 progeny of reciprocal crosses were intermediate between their respective resistant parents and Nugaines in carbohydrate accumulation during cold hardening, carbohydrate use under snow mold conditions, and in resistance. This indicated no cytoplasmic inheritance either of resistance or of patterns of carbohydrate metabolism. Resistance in F1s was partially dominant. Only F1 progeny of C. I. 14106 accumulated carbohydrates rapidly. Under snow mold conditions, progenies of C. I. 14106 and C. I. 9342 used carbohydrate at a slower rate after 30 days than did Nugaines. There was no correlation between snow mold resistance and crown carbohydrate content of 15 wheats sampled in the field in early autumn, but there was a high correlation if they were sampled in the spring after snow melt.