This study was made to demonstrate the relationship between certain growth inhibitors and Salkowski's color reaction inhibitors, and to identify these substances.
1) In ethanolic extract of
Helianthus leaves, there are three substances which inhibit the IAA induced growth of
Avena coleoptile sections.
2) Two of them also inhibit Salkowski's color reaction of IAA.
3) These two substances were identified with chlorogenic and isochlorogenic acid, respectively.
4) Chlorogenic acid inhibits, at 10
-4-10
-3M, the IAA induced growth of
Avena coleoptile and, in concentration of 10
-4M, promotes the elongation in absence of IAA.
5) These effects of chlorogenic acid on growth seem to depend on the change of pH of the test solution due to the addition of different concentration of the acid. But the facts that caffeic acid has an inhibitory effect on growth and the probable occurrence of chlorogenic acid in dormant bud, let the authors have an idea that chlorogenic acid has some role on growth of plant.
6) Chlorogenic acid decreases Salkowski's color development.
7) The growth curve of
Avena coleoptile sections in solutions containing various concentration of chlorogenic acid and the Rf value of chlorogenic acid resemble those of the accelerator-α of Bennet-Clark and Kefford.
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