Seasonal Levels of Abscisic Acid in Buds and Stems of Acer saccharum

Abstract

Changes in abscisic acid (ABA) were followed in the buds and youngest stems of 6‐year‐old sugar maple (Acer saccharum Marsh.) saplings at approximately monthly intervals during the year. High levels present in the buds in July and August showed a moderate decline through early October, but subsequently increased following leaf fall and reached the maximum values detected during the study in November and December. Thereafter ABA fell sharply, reaching its lowest point immediately prior to budbreak in early May. While ABA in the stems followed a somewhat similar pattern, only minor changes were observed in the relatively low values detected between June and November. Except for the spring months, when concentrations of ABA in the stems and buds were at minimum levels, the buds always contained several times more inhibitor per unit dry weight of tissue. Analysis of selected samples from both tissues showed that bound (alkaline‐hydrolyzable) ABA increased during the overwintering season, with the highest values noted in the spring. Although the patterns of change observed in this study are indicative of a role for ABA in the overwintering process, ABA does not appear to be the primary endogenous factor responsible for initiation of the dormant state.

ABA and GA3 increase carbon allocation in different organs of grapevine plants by inducing accumulation of non‐structural carbohydrates in leaves, enhancement of phloem area and expression of sugar transporters

“…Experiments with ABA show contrasting results. Inhibition of cambium growth through a hypothetical negative interaction with IAA has been suggested (Dumbroff et al , Little and Wareing ), whereas ABA sprayed on maize plants increased phloem and xylem areas in female inflorescences thus enhancing transport of water, nutrients and photoassimilates to grains (Travaglia et al ).…”

8. The role of plant growth regulators in dormancy in forest trees

“…(24) observed that ABA levels in buds and stems of A . (24) observed that ABA levels in buds and stems of A .…”

Multiplication végétative de l'Acer saccharum: contribution à la micropropagation

“…Lorsque les explants sont prélevés sur des bourgeons dont la dormance a été levée par un entreposage au froid suffisamment long, les délais de culture sont grandement réduits, diminuant ainsi les coûts de production. Dumbroff et al (1979) rapportent que la concentration d'acide abscissique diminue en fonction de la durée d'entreposage au froid des érables à sucre, atteignant une concentration minimale juste avant le débourrement des bourgeons, ce qui expliquerait la réduction du temps de réactivité des explants en culture in vitro. Dès que la dormance est levée, la vitesse de débourrement des bourgeons est maximale (Kriebel et Wang 1962;Olmsted 1951).…”