Joint Action of Gibberellic Acid and Coumarin in Germination

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THE stimulatory effect of gibberellic acid on germination has been recently observed1–3 and the possible modes by which this is brought to pass have been discussed by Brian4. Coumarin is well known as a germination inhibitor5,6 and is also known to induce light sensitivity in certain seeds not normally requiring light for their germination7. It seemed of interest therefore to determine whether gibberellic acid, like light, could reverse inhibition in coumarin treated seeds. Lettuce seeds, variety Grand Rapids, were allowed to germinate for 48 hr. at 25° C. in the dark in water, or solutions of coumarin, gibberellic acid (sodium salt), or mixtures of the two. The results are shown in Table 1.

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MAYER, A. Joint Action of Gibberellic Acid and Coumarin in Germination. Nature 184, 826–827 (1959) doi:10.1038/184826a0

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