New Zealand Journal of Botany abstracts

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CO EXCHANGE OF PLANTS 1. TECHNIQUE, AND RESPONSE OF SEVEN SPECIES TO LIGHT INTENSITY

D. Scott,* P. H. Menalda, and J. A. Rowley

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

Abstract The apparatus is described and measurements are given of net CO₂ exchange of shoots of holium perenne, Trifolium repens, Lycopersicon esculentum, Cucurbita maxima, Xanthium orientate, Chionochloa rubra, and Celmisia spectabilis at various light intensities. The maximum rates at a photosynthetic irradiance of 300 W.m-² ranged from 35 mg CO₂.g dry weight-^] .hr~¹ for the first three species down to 5 mg.g ^{- 1}.hr - ¹ for the last two, which are indigenous alpine species. The relationship between the species was altered when rates of exchange were expressed per unit leaf area or unit projected leaf area.

(Received for publication 9 October 1968) N.Z. Jl Bot. 8: 82-90

PDF file of entire paper: medium quality (444K); (scanned from paper original: notes about this process)

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