Gibberellic Acid: A Growth Factor in the Unicellular Alga Gymnodinium breve

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Science  07 Aug 1970:
Vol. 169, Issue 3945, pp. 600-601
DOI: 10.1126/science.169.3945.600


Gibberellic acid stimulates growth in the unicellular alga Gymnodinium breve (dinoflagellate). The maximum effect was obtained with 10-7 molar gibberellic acid, whereas concentrations greater than 5 x 10-7 mole per liter were inhibitory. The effect of the compound is observed as a marked shortening of the lag period, which is normally 6 to 8 days after innoculation.

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