Barley yellow dwarf virus-host plant interactions affecting winter stress tolerance in cereals
1990
Paliwal, Y.C. | Andrews, C.J. (Agriculture Canada, Ottawa, Ontario (Canada))
Production of winter cereals in temperature climate is greatly affected by winter stresses and disease incidence. In controlled environment studies, barley yellow dwarf virus (BYDV) infection reduced low temperature tolerance of plants most severly in oats (Avena sativa L.) and barley (Hordeum vulgare L.) and less severely in wheat (Triticum aestivum L.) OC but had no effect in rye C (Secale cereale L.) although rye developed high concentrations of the virus. BYDV caused a rise in the LT50 (temperature at which 50 % of the plants are killed) of 4 to 8degrees Celsius in barley and 2 to 4degrees Celsius in wheat; a change of even 0.5degrees Celsius in LT50 can significantly affect long-term field survival of plants. Survival in ice of infected plants was reduced by 70 to 90 % in barley and 30 to 40 % in wheat. The effects of long (34 days) or short (18 days) disease development periods with and without preinfection cold hardening are discussed, as well as the effects of BYDV on low temperature tolerance and ice survival after flooding. More CO2 and ethanol were accumulated in infected barley and wheat plants during ice encasement. Carbohydrate content of plant crowns and leaf bases is discussed.
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