Description:
<p>Phytohemagglutinin (Difco) stimulates germination and early seedling growth in Phaseolus coccineus, but not in Ph. vulgaris, the species from which the compound is extracted. The differences to the controls reach a maximum at day 8, then they disappear. Root growth in Allium cepa is enhanced by phytohemagglutinin during the first 12 days of treatment, but only at temperatures below 20° C.</p>