Energetics of the response of maize coleoptile tissue to indoleacetic acid |
| |
| Authors: | Paul C. Anderson Rex E. Lovrien Mark L. Brenner |
| |
| Affiliation: | (1) Department of Biochemistry, Gortner Laboratory, College of Biological Sciences, University of Minnesota, 55108 St. Paul, MN, USA;(2) Department of Horticultural Science and Landscape Architecture, College of Agriculture, University of Minnesota, 55108 St. Paul, MN, USA;(3) Present address: Pfizer Central Research, Eastern Point Road, 06340 Groton, CT, USA |
| |
| 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.Abbreviation IAA indole-3-acetic acid |
| |
| Keywords: | Auxin Calorimetry Coleoptile Energetics Growth regulator Zea |
| 本文献已被 SpringerLink 等数据库收录！ |
|
