Acid growth effects in maize roots: Evidence for a link between auxin-economy and proton extrusion in the control of root growth |
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| Authors: | M M Moloney M C Elliott R E Cleland |
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| Institution: | (1) School of Life Sciences, Leicester Polytechnic, LE1 9BH Leicester, UK;(2) Department of Botany, University of Washington, 98105 Seattle, WA, USA;(3) Present address: Institut de Biologie et de Physiologie Végétales, Université de Lausanne, CH-1005 Lausanne, Switzerland |
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| Abstract: | The role of proton excretion in the growth of apical segments of maize roots has been examined. Growth is stimulated by acidic buffers and inhibited by neutral buffers. Organic buffers such as 2N-morpholino] ethane sulphonic acid (MES) — 2-amino-2-(hydroxymethyl)propane-1,3 diol (Tris) are more effective than phosphate buffers in inhibiting growth. Fusicoccin(FC)-induced growth is also inhibited by neutral buffers. The antiauxins 4-chlorophenoxyisobutyric acid (PCIB) and 2-(naphthylmethylthio) propionic acid (NMSP) promote growth and H+-excretion over short time periods; this growth is also inhibited by neutral buffers. We conclude that growth of maize roots requires proton extrusion and that regulation of root growth by indol-3yl-acetic acid (IAA) may be mediated by control of this proton extrusion.Abbreviations IAA
indol-3yl-acetic acid
- ABA
abscisic acid
- FC
fusicoccin
- PCIB
4-chlorophenoxy-isobutyric acid
- MES
2(N-morpholino)ethane sulphonic acid
- Tris
2-amino-2-(hydroxymethyl) propane-1,3-diol
- NMSP
2-(naphthylmethylthio)propionic acid |
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| Keywords: | Acid growth Auxin Growth Root Zea |
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