Abstract
Two distinct patterns of whole-plant transpiration were observed in potted roses using an acquisition network that integrated a Dansk Gartneri Teknik climate computer, Dynamax heat-balance sap-flow gauges, Fisher electronic-balance lysimeters, and Everest infrared leaf temperature sensors. One pattern consisted of a steady rate of transpiration in a stable greenhouse environment. The second pattern consisted of large oscillations in transpiration that were unrelated to any known microclimate rhythms. These oscillations had a sine-wave pattern with periods between 60-90 minutes and ranges between 3 and 37 g·hr-1 in natural light and 2 and 69 g·hr-1 in artificial light during the night. Leaf temperatures also oscillated, but were inversely related to the transpiration cycles. Oscillatory transpiration has not been reported in roses.Oscillatory transpiration is an example of the phenomena that may now be investigated by integrating climate computers and sensors that monitor plant physiological processes. When plant responses to microclimate variables can be predicted and monitored in real time, the `speaking plant approach' can be used, in which plants directly control their greenhouse environment.
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