The effect of the photoperiod on the level of endogenous growth regulators in pine pinus sylvestris seedlings
Kriesel, K.; Ciesielska, S.
Acta Societatis Botanicorum Poloniae 51(1): 59-70
The investigations were performed on pine seedlings growing under 12, 16 and 20 h photoperiods. In 4 succesive stages of seedling development, i.e., after 2, 12, 18 and 30 wk of culture morphological characters of the seedlings were measured and the levels of auxins-, gibberellins-, cytokinins- and abscisic acid-like inhibitor were determined. The intensity of growth development of juvenile leaves, needles and of the shoot was the lowest in plants growing under 12-h photoperiod conditions. As the length of the photoperiod increased so did the intensity of these processes. Under the 12 h photoperiod the development of scale leaves, axillary buds and the formation of the terminal bud started earliest. This process reached completion under the 12-h photoperiod and the bud remained in a state of dormancy. Seedlings growing under the 12-h photoperiod were characterized by a low level of stimulators, and at the same time by a high level of inhibitors. On the other hand in seedlings grown at 16 and 20 h photoperiods the content of stimulators was higher and that of inhibitors lower. A high growth and development processes was correlated with a high level of stimulators while a high level of inhibitors was correlated with a low intensity of these processes. The obtained results suggest the participation of gibberellins and cytokinins in the processes of regulation of the initiation of scale leaves and axiliary buds, and the participation of these hormones and of abscisic acid in the regulation of needle elongation.