Abstract
Gibberellic acid (GA) counteracted the inhibitory effect of continuous tungsten irradiation on the germination of seeds of Phacelia tanacetifolia. The extent of reversal of the inhibition varied with the level of irradiation, temperature, and concentration of GA and was nearly complete under 2 ft-c at 10⚬ C with 250 ppm GA. GA and the factors involved in the radiation-inhibition appeared to act independently. No evidence was found for the involvement of auxin metabolism in the response.
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