CO2exchange of plants

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Abstract
The CO2 exchange of shoots of Trifolium repens, Fragaria chiloensis × virginiana, Celmisia spectabilis, Lycopersicum esculentum, Lolium perenne, and Chionochloa rubra were determined at exposed leaf temperatures of 4° to 55°c and five light intensities. The maximum rates of exchange for the first three species at a photosynthetic irradiance of 340 W.m−2 were 58, 23, and 5 mg CO2.g−1.hr−1 respectively, and for the remaining species at 270 W.m−2 were 45, 49, and 4 mg CO2.g−1.hr−1 respectively. CO2 release in the dark increased 5- to 1O-fold over the range 2° -30°c. At high light intensities {itCelmisia spectabilis} and {itChionochloa rubra} had their maximum rates of uptake at the lowest temperatures. The other four species had their maximum rate of uptake in the 20°_35°c exposed-leaf temperature range, the rate decreasing rapidly to a net release in the 40° -50°c range.