Abstract
The pterocarpinoid phytoalexins, glyceollin, pisatin, and phaseollin, stimulated adventitious root formation in a mung bean rooting bioassay only in the presence of indoleacetic acid (rooting cofactor activity). Relatively low (5 to 50 micrograms per milliliter) concentrations of the phytoalexins were effective. The phytoalexins also increased the numbers of root primordia formed, therefore suggesting that they interacted with an early process in root formation.
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