INDOLEACETIC-NICOTINIC ACID INTERACTIONS IN THE ETIOLATED PEA PLANT

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Abstract
Various physiological interactions between indoleacetic acid (IAA) and nicotinic acid (NA) have been demonstrated in the etiolated pea epicotyl. For example, NA enhances the root initiation activity of IAA (synergism), but IAA reverses the bud-growth stimulation produced by NA (antagonism). Evidence from bioassays indicates that tryptophan may be converted rapidly to IAA and slowly to NA, the latter conversion apparently occurring through kynurenine and 3-hydroxyanthranilic acid as intermediates. It is suggested that the various IAA-NA interactions may be explained on the basis of their origin from a common precursor, tryptophan.