Abstract
The effects of pyridine and pyrazine carboxylic acids derivatives on growth, floral induction, and the contents of niacin and NAD in the short-day plant Lemna paucicostata 151 were investigated. Among the compounds which promoted plant growth, cinchomeronic acid and trigonelline were the most effective. Picolinic acid was the strongest inhibitor of plant growth among tested. These effects may be concerned with the biosynthesis and metabolism of NAD. The results obtained in this study suggested that the substituents on the third position of the pyridine ring require large volume and high electronegativity to promote plant growth. Floral induction was observed with nicotinamide, isonicotinamide, pyrazinamide, etc.
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