New Zealand Journal of Botany abstracts

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361 CO₂ EXCHANGE OF PLANTS 2. RESPONSE OF SIX SPECIES TO TEMPERATURE AND LIGHT INTENSITY

D. Scott* and P. H. Menalda

Plant Physiology Division, Department of Scientific and Industrial Research, Palmerston North

Abstract The CO₃ exchange of shoots of Trifolium repens, Fragaria chiloensis x 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 COj.g-Vhr-¹ respectively, and for the remaining species at 270W.m~² were 45, 49, and 4 mg CO..g-^a.hr-¹ respectively.CO₂ release in the dark, increased 5- to 10-fold over the range 2°-3O°c. At high light intensities Celmisia spectabilis and Chionochloa 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.

Received for publication 4 July 1969) N.Z.Jl Bot.8: 361-8

PDF file of entire paper: medium quality (414K); (scanned from paper original: notes about this process)

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