Abstract
Indole-3-acetic acid (IAA) and abscisic acid (ABA) were identified by combined gas chromatography-mass spectrometry (GCMS) in fractions obtained by diffusion and extraction from bark peelings of Sitka spruce. A procedure is described for the quantitative analysis of IAA and ABA levels in the same extract using the GCMS technique of single-ion current monitoring. This procedure was used to measure the diffusible, free, and bound fractions of IAA and ABA in the cambial region of Sitka spruce throughout one year; the range in concentration for these fractions was 0.06–0.30, 0.46–3.85, and 0.04–0.20 μg/g oven-dry weight, respectively, for IAA, and 0–0.08, 0.03–2.21, and 0.13–0.66 μg/g oven-dry weight, respectively, for ABA. Movement in the cambial region was found to be polar for endogenous IAA and nonpolar for endogenous ABA. Recoveries of [14C]IAA internal standards showed that 73–99.5% of the IAA was lost during purification, and that there could be up to 5-fold differences in recovery between purifications, indicating that IAA loss shold be measured in quantitative analyses.
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Abbreviations
- ABA:
-
aoscisic acid
- GCMS:
-
combined gas chromatography-mass spectrometry
- IAA:
-
indole-3-acetic acid
- PVP:
-
polyvinylpyrrolidone
- SICM:
-
single ion current monitoring
- TMS:
-
trimethylsilyl
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Little, C.H.A., Heald, J.K. & Browning, G. Identification and measurement of indoleacetic and abscisic acids in the cambial region of Picea sitchensis (Bong.) Carr. by combined gas chromatography-mass spectrometry. Planta 139, 133–138 (1978). https://doi.org/10.1007/BF00387138
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DOI: https://doi.org/10.1007/BF00387138