Plant Physiol. Drug Metab Dispos
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Plant Physiology 71:562-567 (1983)
© 1983 American Society of Plant Biologists

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Articles

Temperature Dependence of Vegetative Growth and Dark Respiration: A Mathematical Model

Martin P. N. Gent and Herbert Z. Enoch1

Department of Ecology and Climatology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut 06504

A mathematical model of the processes involved in carbon metabolism is described that predicts the influence of temperature on the growth of plants. The model assumes that the rate of production of dry matter depends both on the temperature and the level of nonstructural carbohydrate. The level of nonstructural carbohydrate is determined by the rates of photosynthesis, growth, and maintenance respiration. The model describes the rate of growth and dark respiration, and the levels of carbohydrate seen in vegetative growth of carnation and tomato. The model suggests that the growth of plants at low temperatures is limited by a shortage of respiratory energy, whereas at high temperatures growth is limited by the shortage of carbohydrate. Thermoperiodism, wherein a warm day and cool night results in faster growth than does constant temperature, is explained by the model as an increase in the level of nonstructural carbohydrate which promotes the rate of growth relative to the rate of maintenance respiration.

1 Permanent address: Agricultural Research Organization, Volcani Center, Division of Agricultural Meterology, P.O.B. 6, Bet-Dagan, Israel.




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Copyright © 1983 by the American Society of Plant Biologists