Abstract
Indole-3-acetic acid (IAA) promotes an increase in steady-state heat production by corn (Zea mays L.) coleoptile tissue; this increase is associated with an elevation in aerobic respiration rates. A detailed time dependence of the exothermic response to IAA was obtained using flow calorimetry. The latent period and magnitude of response were evaluated as a function of IAA concentration and pH. The data indicate that more than one response may occur. The optimal change in heat production was produced by an IAA concentration of 3·10-5 M. It was initiated within 5 min after the start of the IAA treatment, and reached a magnitude in excess of 25% of the tissue's basal heat production. Concentrations of IAA greater than 1·10-4 M resulted in diminished response(s), but the effect was strongly pH dependent. Several possibilities for the increased heat production triggered by IAA are discussed.
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Abbreviations
- IAA:
-
indole-3-acetic acid
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Anderson, P.C., Lovrien, R.E. & Brenner, M.L. Energetics of the response of maize coleoptile tissue to indoleacetic acid. Planta 151, 499–505 (1981). https://doi.org/10.1007/BF00387426
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DOI: https://doi.org/10.1007/BF00387426