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Environmental and Stress Physiology

Whole Plant CO₂ Exchange Measurements for Nondestructive Estimation of Growth ¹

Department of Horticultural Science, University of Guelph, Guelph, Ontario, Canada

A computer controlled semiclosed net CO₂ exchange measurement system, employing an infrared gas analyzer and mass flow controllers to inject pure CO₂ at preset rates, has been developed for measuring whole plant net CO₂ exchange and net C gain in a controlled environment (i.e. CO₂, light, and temperature). Data for tomato (Lycoperscicon esculentum cv Campbell 19 VF) and rose (Rosa hybrida cv Samantha) plants grown for 4 and 17 day periods, respectively, clearly show that net C gain measured and computed using nondestructive CO₂ analysis equaled the increase in C content determined by chemical analysis following destruction of the test plants. The analysis of C gain based on CO₂ exchange allows estimation of biomass production and growth of a single population of plants under varying light and CO₂ conditions without physically handling the test plants.

¹ Supported by grants from the Natural Science and Engineering Research Council of Canada, and Agriculture Canada and the Cecil Delworth Foundation to M. J. T. and B. G.

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