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Abstract: The growth of the common mushroom fruit body was investigated with particular attention to hormonal principles. A convenient and sensitive procedure, the Agaricus test, was established by using appropriately trimmed fruit bodies. Various fractions of mushroom extracts were examined for their growth promoting effect. Amino acids and a few inorganic nitrogen compounds were found to be most effective. Auxins, free and bound, although they were found in abundance, were ineffective in promoting growth. Mushroom juice was found to possess the non-enzymatic property of converting tryptophan into auxin. The mode of action of amino acids was also investigated in relation to the general nitrogen metabolism affecting the growth, including research on translocation of amino acids by tracer experiments with labeled compounds. These amino acids appeared to act as stimulators or reactivators of the nitrogen metabolism rather than as mere structural materials.
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