Photosynthesis and Root Respiration in Ilex crenata `Rotundifolia' at Supraoptimal Root-zone Temperatures

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  • 1 Ornamental Horticulture Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611

Rooted stem cuttings of Ilex crenata Thunb. `Rotundifolia' were grown in a controlled-environment growth chamber. Root-zone temperatures were controlled with an electric system. Shoot carbon exchange and root respiration rates were determined in response to root-zone temperatures of 28, 32, 36, and 40C for 6 hour·day–1 for 7 days. Photosynthesis was decreased by root zones ≥ 32C, while root respiration increased with increasing root-zone temperature. Decreased photosynthetic rates were not due to increased stomatal resistance.

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