ISSN:
1435-8107
Schlagwort(e):
Auxin-binding protein 1
;
Binding affinities
;
Elongation growth
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Abstract 4-Chlorindole-3-acetic acid (4-CI-IAA), an endogenous auxin in certain plant species of Fabaceae, has a higher efficiency in stimulating cell elongation of grass coleoptiles compared with indole-3-acetic acid (IAA), particularly at low concentrations. However, some investigations reported a 1,000-fold discrepancy between growth stimulation and binding affinity of 4-CI-IAA to auxin-binding protein 1 (ABP1) from maize. Here we report binding data of 4-CI-IAA and three alkylated IAA derivatives using purified ABP1 in equilibrium dialysis. There is a clear correlation between the growth-promoting effects and the binding affinity to ABP1 of the different IAA analogues measured by competition of [3H]naphthalene-1-acetic acid binding. Our data are consistent with the hypothesis that ABP1 mediates auxin-induced cell elongation.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00213127
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