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Articles

Gain of the Feedback Loop Involving Carbon Dioxide and Stomata

Theory and Measurement ¹

MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

The physiological and physical components of the feedback loop involving intercellular CO₂ concentration (c_i) and stomata are identified. The loop gain (G) is a measure of the degree of homeostasis in a negative feedback loop [the expression 1/(1-G) represents the fraction to which feedback reduces a perturbance]. Estimates are given for the effects of G on responses of stomata and c_i to changes in ambient CO₂ concentration, light intensity, and perturbations in the water relations of a leaf. At normal ambient CO₂ concentration, the gain of the loop involving stomatal conductance and c_i was found to be –2.2 in field-grown Zea mays, –3.6 if plants of this species were grown in a growth chamber, and zero in well watered Xanthium strumarium in the vegetative state.

¹ Research supported by the United States Department of Energy under Contract EY-76-C-02-1338. Part of a M.S. thesis by D. R. D.

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