Inhibition of Phototropism and Gravitropism in Cuttings of Bean (Phaseolus angularis) by Treatment with Myrmic Acid and Related Compounds

Abstract

Pelargonic acid, capric acid, 2-decenoic acid and myrmicacin (3-hydroxydecanoic acid) monocarboxylic acids [found in secretions of the South American leaf-cutting ant, Atta sexdens] inhibited positive phototropism and negative gravitropism in cuttings of bean (P. angularis) seedlings. However, no inhibition was observed when the dicarboxylic acids, azelaic acid and sebacic acid were used. In cuttings partially treated with 2-decenoic acid, phototropic activity remained only in the untreated parts.