Modeling of dormancy and cold hardiness in red-osier dogwood (Cornus sericea L.) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zk51vj84f

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  • Effects of temperature and growth stage on vegetative bud development and stem hardiness of red-osier dogwood during winter dormancy were investigated. Results were related to a degree growth stage model and were used to develop models to predict growth stages, to quantify development, and to predict hardiness. Maximum rest development was promoted by 5°-20°C with increasing rate with decreasing temperature. Developmental rates changed throughout this phase. Chilling temperatures to deepen rest were effective from vegetative maturity. Model predicted maximum rest by two days in both years and daily developmental status. In the decreasing rest phase, development was promoted by 5°-15°C with increasing rate with decreasing temperature. No development occurred at 20°C. Developmental rates changed throughout this phase. Chilling temperatures to decrease rest were effective from maximum rest. Model predicted end of rest by three days in both years and daily developmental status. In the quiescent phase, development was promoted by 5°-20°C with increasing rate with both increasing temperature and developmental stage. Model predicted spring bud break within three days for both years. Accuracy in predicting daily developmental status varied between years. Decreasing temperatures promoted increasing acclimation. Acclimation rates at 5°-20°C increased from vegetative maturity and were highest at maximum rest. In the decreasing rest phase, 7°-20°C caused deacc1imation. Early in the quiescent phase only 5°C promoted acclimation; later, all temperatures caused deacc1imation. Accuracy of models in predicting hardiness varied among developmental phases and between years with average deviations of 1.8° to 4.7°C.
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