PT  - JOURNAL ARTICLE
AU  - C.L. Stinemetz
AU  - B.R. Roberts
TI  - An Analysis of the Gibberellic and Abscisic Acid Content of White Ash Seeds
AID  - 10.48044/jauf.1984.060
DP  - 1984 Oct 01
TA  - Arboriculture & Urban Forestry (AUF)
PG  - 283--285
VI  - 10
IP  - 10
4099  - http://auf.isa-arbor.com/content/10/10/283.short
4100  - http://auf.isa-arbor.com/content/10/10/283.full
AB  - 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-yr-old 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.