Abstract
SummaryUsing the oat mesocotyl test (NITSCH and NITSCH, 1956) it could be demonstrated be that numerous, naturally-occurring substances can act as strong synergists of 3-indolylacetic acid (IAA) in promoting elongation. A mathematical expression of synergism is given. Strong synergists of IAA are: chlorogenic and iso-chlorogenic acids, protocatechuic acid, glutathione and its components, quercetin and its derivatives such as quercitin and rutin, kaempferol, α-tocopherol and vitamin K1. Strong inhibitors are (trans)-p-coumaric acid, naringenin and naringin, coumarin and scopoletin. Other compounds, such as ortho- and meta-coumaric acids or phytol did not have strong effects. Gibberellic acid gave no synergistic response with IAA. In general, the mentionned synergists showed no synergism with -naphthylacetic acid nor with gibberellic acid. The possible physiological significance of natural synergists is pointed out in the case of dormancy (glutathione), flowering (α-tocopherol) and volubilism (flavonoids).
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