Summary The effect of Triacontanol (TRIA) was tested in several bioassay systems and its activity compared to that of the commonly known growth regulants viz., Indole-3-yl acetic acid (IAA), Gibberellie acid (GA), and 6-aminofuifuryl purine (Kn). TRIA produced only slight growth responses in these bioassay systems. In combination with other growth substances, TRIA showed a slight synergism. The exact role and mode of action of TRIA in plant growth regulation still remain uncertain.
