Metabolic Responses to Auxin. V. Dissociation by Carbon Monoxide of Effects of Indoleacetic Acid on Growth and Respiration

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Abstract
In isolated pea internode segments the effect of indoleacetic acid on O2 uptake is completely and light reversibly suppressed by a CO/O2 ratio of 2.8:1, which inhibits only 20-25% of the basal respiration. Under the same condition, the auxin still stimulates growth by cell extension. The absolute growth values of the segments treated with indoleacetic acid and CO appear consistently higher than those of the controls in distilled water and air, in spite of the fact that the O2 uptake of the former is about 25% lower than that of the latter. These results are interpreted as showing that the activation of overall oxidative metabolism is not a necessary prerequisite for the effect of auxin on growth.