Abstract
Arachidonic acid and PGE1 (10-4 M) hastened the time to flowering of Pharbitis nil plantlets which developed from excised shoot apices under inductive conditions (short days). Gentisic acid, acetylsalicylic acid, salicylic acid and oleic acid, all known inhibitors of prostaglandin synthetase, inhibited flowering of plantlets under inductive conditions. Arachidonic acid and PGE1, PGE2, PGF1a, PGF2a, PGA1, PGA2, PGB1, and PGB2, (10-4 M, 10-5 M and 10-6 M) did not induce flowering in plantlets which were kept under long days. However, leaf blade growth was reduced by the treatments. A hypothetical scheme is presented for the possible regulation of flowering by prostaglandins and phenolic acids (salicylic acid).
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