Mung bean ( Phaseolus aureus Roxb.) cuttings and cucumber ( Cucumis sativus L. cv. Marketer) seedlings were cultured in water extracts of bark from silver maple ( Acer saccharinum L.) hackberry ( Celtis occidentalis L.), sycamore ( Platanus occidentalis L.) and cottonwood ( Populus deltoides Marsh.). Extracts of fresh silver maple bark inhibited root elongation of cucumbers and the adventitious rooting of mung bean. Composting the silver maple bark for 30 days prior to preparing the water extracts reduced inhibition. Pretreatment of fresh silver maple bark extracts with insoluble polyvinylpyrrolidone (PVP) reduced inhibition and indicated that the inhibitory compound was phenolic in nature. Chromatography and spectral analysis of common phenolic compounds and silver maple bark extracts revealed the toxic substance was similar to tannic acid.
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Still et al. (1976) studied this question.
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