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Influence of Temperature and Light on Spore Production of Puccinia graminis tritici. A. S. Prabhu, Rockefeller Foundation Postdoctoral Fellow, 1968-1969, Division of Mycology and Plant Pathology, Indian Agricultural Research Institute, Delhi; Jack R. Wallin, Research Plant Pathologist, ARS, USDA, Iowa State University, Ames 50010. Phytopathology 61:120-121. DOI: 10.1094/Phyto-61-120.

From a single rust (Puccinia graminis tritici) pustule on a Baart wheat plant subjected to a 12-hour photoperiod and sampled hourly for 7 days, significantly more spores were produced during the light period than during the dark. The number of spores produced during the light period was significantly greater than those produced during the dark period when rust pustules were subjected to a 12-hour photoperiod for 9 days. There were no significant differences in spore production on plants exposed to 800 or 150 ft-c. There were highly significant differences in spore production at different temperatures on plants placed in continuous light and programmed for successive 6-hour periods of 24, 29, 18, and 13 C for 11 days; the greatest number were produced at 29 and the fewest at 13 C. Differences in spore production between individual days also were highly significant.