Abstract
Levels of abscisic acid (ABA) in the roots of sugar maple ( Acer saccharum Marsh.) were monitored at monthly intervals throughout the year. The highest concentrations were observed during the period of maximum shoot extension in May and June while low levels were associated with the periods of vigorous root growth that occur prior to bud break in spring and in the fall. Alkaline hydrolyzable abscisic acid (ABA) was not detected in any of the samples examined which suggests that conversion of abscisic acid (ABA) to a storage form is probably not an important mechanism for controlling levels of free abscisic acid (ABA) in the roots of sugar maple. Although moisture content of the roots was high when abscisic acid (ABA) levels were elevated, a causal relationship between the two factors was not apparent. Percent water in the roots rose to a spring and summer plateau several weeks prior to the June increase in abscisic acid (ABA).
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