THE EFFECT OF LIGHT CONDITIONS ON REGENERATION AND LEVEL OF ENDOGENOUS GROWTH REGULATORS IN MUSCARI RACEMOSUM /L./ MILL. BULB-SCALE SECTIONS CULTURED IN VITRO
The activities of endogenous growth regulators were determined by means of bioassays: 1/ at the moment of culture establishment in the tissues of the basal halves of the bulbs, 2/ after four months of culture in tissues of explants growing: a/ in light, b/ in the dark. Determination of growth regulators in investigated basal halves of bulb tissues revealed low activities of auxin- and gibberellin-like substances and increased activity of cytokinin. Light treatment of explants cultured in vitro caused an insinificant increase of auxin activity and slightly decreased the activity of gibberellin. Greater differences were observed in the activities of cytokinins, which was distinctly higher in light-grown explants.