Relationship between Structure and Flower-inducing Activity of Benzoic Acid Derivatives in Lemna paucicostata 151

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Lemna paucicostata, strain 151, does not flower when grown in 1/10 strength M medium containing 1% sucrose, but easily flowers when benzoic acid or its substituted derivatives are added to the medium. The structure-activity relationship of benzoic acid derivatives are quantitatively analyzable by means of physicochemical parameters. Aromatic substituent constants a (electronic parameter) and Vw (van der Waals volume steric parameter) delineate the variations in the flower-inducing activity, i.e., the higher the electron-withdrawing ability as well as the less the bulkiness of the substituents, the higher the activity. The exceptions are the derivatives substituted with NO_2 at any position and with OH at meta and para positions. ; they exhibit an activity lower than expected from their substituent parameters. 2-Hydroxybenzoic acid (salicylic acid) exhibits activity higher than the calculated value, suggesting participation of the chelating effect in the flower-inducing activity besides electronic and steric effects. The molecular form responsible for the activity is suggested to be an undissociated neutral species.
日本植物生理学会の論文