The total contents of ITCs (lmol/g d.w.) in plant samples determined either as ITC-NAC conjugates by the NAC derivatization method (grey bars) or as BDTT by Zhang’s
method (white bars). Two scales are applied in the graph depending on ITC content in samples analyzed. The conditions of derivatization reactions were as described under
Materials and Methods. The values are means ± SD of 3–6 independent determinations.