Possible role of N-malonyl-D-tryptophan as an auxin precursor

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Abstract
N-malonyl-D-tryptophan (MT) and D-tryptophan added to the medium instead of auxin stimulated growth of soybean and tomato cell and tissue cultures. Effects of 50–100 μmol 1-1 MT and 100 –300 μmol 1-1 D-tryptophan were equal to the effect of 3–10 μmol 1-1 IAA. Soybean cells grown in the presence of 100 μmol 1-1 MT contained 125–170 ng IAA per 1 g fresh mass (as determined by spectrofluorimetric indole-α-pyrone method), whereas the cells grown in the presence of NAA 10. 7 μmol 1-1 contained 50 –60 ng IAA and the cells grown in the absence of auxin failed to show endogenous IAA. MT as proposed can be hydrolyzed by plant cells with liberation of D-tryptophan, which in turn can be used in IAA synthesis. It is proposed that MT is a possible source of endogenous auxin in plants.