Abstract
Abstract Seedlings of Malus hupehensis Rehd., M. domestica Borkh. cv. Northern Spy and Betula papyrifera Marsh were grown under short and long photoperiods, with other environmental conditions being similar. M. hupehensis seedlings stopped elongation under short days (SD) and continued growth under long days (LD). There was no significant difference in abscisic acid (ABA) content in shoot tips taken from seedlings under either photoperiod. ‘Northern Spy’ seedlings ceased growth under SD, but neither did they grow vigorously under LD. Shoot tips of these seedlings were not significantly higher in ABA content when grown under SD. Betula seedlings discontinued elongation under short photoperiods, while LD promoted growth. Betula shoot tips from LD seedlings had more ABA than from seedlings grown under SD. These data do not support the hypothesis that SD causes cessation of shoot elongation by inducing a build up of ABA.
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