Abstract
Triacontanol at concentrations from 2.3 × 10‐9M to 2.3 × 10‐7M did not affect the germination of lettuce (Lactuca sativa L., cv. Grand Rapids) seeds in darkness, stimulated by light at 25°C or by benzyladenine at 31°C. Stimulation of seed germination by gibberellin A3 (10‐5M) was significantly inhibited by triacontanol; the most effective concentration was 4.6 × 10‐8M. Pulse experiments demonstrated that triacontanol was ineffective when applied later than gibberellin, whereas an inverse sequence of treatment caused an inhibition comparable to that resulting from continuous treatment of seeds with both factors. Possible interaction of triacontanol with gibberellin receptor is discussed.
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