Abstract
For cherry breeding it may be of importance to know the factors affecting the growth and development of cherry seedlings. Since it is known from the literature that the photoperiod is an important factor in the annual growth cycle in woody plants, experiments on the influence of the photoperiod were started in the phytotron of our Institute. The effect of 8 and 16-hr. photoperiods on the shoot growth of first- and second-year seedlings of Limburgse boskriek (P. avium L.) was studied at a constant temperature of 20°C. In one experiment the influence of a 24-hr. photoperiod in second-year seedlings was also studied. It was found that under the conditions of these experiments first- and second-year cherry seedlings respond differently to the photoperiod as regards termination of shoot growth. In first-year seedlings many of the plants under 8 and 16-hr. photoperiods terminated their growth at the same time. However, some of the plants under an 8-hr. photoperiod terminated growth much sooner, while a number of plants grown under a 16-hr. photoperiod terminated their growth considerably later. In second-year seedlings growth was terminated at about the same time under 8, 16 and 24-hr. photoperiods.
Accepted Version
Published Version
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