Abstract
Using high performance liquid chromatography, the content of gibberellic acid (GA) and abscisic acid (ABA) was examined in white ash seeds (Fraxinus americana) ranging in age from 1 to 10 years. The youngest seeds exhibited the highest level of GA, after which the GA content decreased rapidly. The greatest concentration of ABA was found in 4-yrold seed. Germination tests showed that germination rate could be enhanced in older seeds with lower concentrations of exogenous GA. Furthermore, the germination of seeds receiving no exogenous GA showed a high positive correlation to fluctuations in the endogenous GA:ABA ratio. Thus, the initiation of germination in white ash seeds appears to be affected by the relative concentrations of these two hormones.
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