The biosynthesis and conjugation of indole-3-acetic acid in germinating seed and seedlings ofDalbergia dolichopetala |
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Authors: | A M Monteiro A Crozier G Sandberg |
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Institution: | (1) Department of Botany, Glasgow University, G12 8QQ Glasgow, UK;(2) Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-901 83 Umeå, Sweden;(3) Present address: Departmento de Fisiologia Vegetal, I.B., UNICAMP, 13081 Campinas, S.P., Brazil |
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Abstract: | Germinating seed ofDalbergia dolichopetala converted both 2H5]l-tryptophan and 2H5]indole-3-ethanol to 2H5]indole-3-acetic acid (IAA). Metabolism of 2 -14C]IAA resulted in the production of indole-3-acetylaspartic acid (IAAsp), as well as several unidentified components, referred to as metabolites I, II, IV and V. Re-application of 14C]IAAsp to the germinating seed led to the accumulation of the polar, water-soluble compound, metabolite V, as the major metabolite, together with a small amount of IAA. Metabolites I, II and IV were not detected, nor were these compounds associated with the metabolism of 2 -14C]IAA by shoots and excised cotyledons and roots from 26-d-oldD. dolichopetala seedlings. Both shoots and cotyledons converted IAA to IAAsp and metabolite V, while IAAsp was the only metabolite detected in extracts from excised roots. The available evidence indicates that inDalbergia, and other species, IAAsp may not act as a storage product that can be hydrolysed to provide the plant with a ready supply of IAA.Abbreviations HPLC-RC
high-performance liquid chromatography-radiocounting
- IAA
indole-3-acetic acid
- IAAsp
indole-3-acetylaspartic acid
- IAlnos
2-O-indole-3-acetyl-myo-inositol
- IEt
indole-3-ethanol |
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Keywords: | Auxin (biosynthesis conjugation) Dalbergia Indole-3-acetylaspartic acid Seed germinating |
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