Concentrations of IAA in the stem base of cuttings were analysed on a Varian Saturn 2200 ion-trap mass spectrometer connected to a CP-3800 gas chromatograph (Agilent, Santa Clara, CA, USA) using (2H)2-IAA as internal calibration standard. The general extraction and clean-up protocols of samples, parameters of gas chromatography and settings of mass spectrometry of IAA are described by Ahkami et al. (2013) (link).
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