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Ecology and Epidemiology

Pathological Factors Affecting Survival of Winter Barley Following Controlled Freeze Tests. Myrtle N. Smith, Laboratory Research Technician III, Department of Crop and Soil Sciences, Michigan State University, and Agriculture Research Service, U.S. Department of Agriculture, East Lansing, MI 48824; C. R. Olien, Plant Physiologist, Department of Crop and Soil Sciences, Michigan State University, and Agriculture Research Service, U.S. Department of Agriculture, East Lansing, MI 48824. Phytopathology 68:773-777. Accepted for publication 31 October 1977. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-773.

Recovery from freeze injury is one component of winter hardiness in barley. The intent of this study was to determine to what extent pathogens and nutritional factors introduced during the recovery phase would modify survival of barley following a freeze test. Hardiness, as measured by development of new roots from crown meristems after controlled freeze tests, was depressed by inoculation with Fusarium roseum f. sp. cerealis 'Avenaceum'. Supplementation of the fungus with glucose and amide nitrogen, compounds known to accumulate in hardened plants, further reduced survival.

Additional keywords: predisposition, plastic strain, stress.