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PLANT PHYSIOLOGY , Vol 108, Issue 3 1043-1047, Copyright © 1995 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
A Microscale Technique for Gas Chromatography-Mass Spectrometry Measurements of Picogram Amounts of Indole-3-Acetic Acid in Plant Tissues
A. Edlund, S. Eklof, B. Sundberg, T. Moritz and G. Sandberg
Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-901 83 Umea, Sweden
A microscale technique has been developed for routine quantifications of
picogram amounts of indole-3-acetic acid (IAA) in plant tissues by combined
gas chromatography-mass spectrometry. Low- and high-resolution
selected-ion-monitoring and selected-reaction-monitoring mass spectrometry
techniques were compared for selectivity and precision. The best
selectivity was obtained with selected-reaction-monitoring analysis, and
1-mg samples containing 500 fg of IAA could be analyzed accurately with
this method. This technique was used to investigate the IAA distribution
pattern along the longitudinal axis of tobacco (Nicotiana tabacum [L.])
leaves. In young, developing leaves an increase of endogenous IAA from the
leaf tip to the base of the leaf was observed, whereas the level of IAA was
uniform along this axis in mature leaves.
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