A reassessment of the binding of napthaleneacetic acid by membrane preparations from maize |
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Authors: | George J P Murphy |
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Institution: | (1) A.R.C. Unit of Developmental Botany, 181A Huntingdon Road, CB3 ODY Cambridge, UK;(2) Present address: Plant Breeding Institute, Maris Lane, Trumpington, CB2 2LQ Cambridge, UK |
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Abstract: | Naphthalene-1-acetic acid (NAA) binding by membrane fractions derived from maize has been re-evaluated. Using a computer curve-fitting procedure only one major type of NAA binding, in terms of binding affinity, could be identified. Auxins, antiauxins and structurally related compounds have been tested for their competitive effect on NAA binding and the inhibitor constants for a number of these have been determined. Extracts from various plant species have been examined for their NAA binding ability, but all showed much less binding than maize leaf or coleoptile preparations. The possibility of the NAA binding by maize extracts being due to a true hormone receptor is discussed.Abbreviations BA
benzoic acid
- CPIB
p-chlorophenoxyisobutyric acid
- 2,4-D
2,4-dichlorophenoxyacetic acid
- DCB
2,4-dichlorobenzoic acid
- IAA
indolyl-3-acetic acid
- NAA
napthalene-1-acetic acid
- 2-NAA
napthalene-2-acetic acid
- NAOA
napthalene-2-oxyacetic acid
- PA
phenylacetic acid
- PU
phenylurea
- 2,4,5-T
2,4,5-trichlorophenoxyacetic acid
- TIBA
2,3,5-triiodobenzoic acid |
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Keywords: | Auxin binding Site number Zea |
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