© 1986 Heron Publishing—Victoria, Canada
Effects of ABA application on cessation of shoot elongation in long-day grown Norway spruce seedlings
Ola M. Heide
Department of Botany, Agricultural University of Norway, P.O. Box 14, N-1432 Aas-NLH, Norway / Received December 19, 1985
Summary
Abscisic acid (ABA) was applied in lanolin to apical buds of Norway spruce (Picea abies (L.) Karst.) seedlings actively growing in a 24 h photoperiod. At a rate of 100 μg per plant, ABA suspended shoot elongation
for about three weeks in the majority of plants but failed to induce normal winter buds. The role of ABA in the induction
of dormancy is thus uncertain in conifers as well as in deciduous woody plants.
