XVI International Botanical Congess

The purpose of our work was to study water state (WS), ion homeostasis (IH) and actin cytoskeleton during the flowering induction (FI) of short-day plants by a favorable photoperiod and floral stimulus (FS). Flower inducing activity was shown in extracts from flowering tobacco plants M. Mammoth using bioassay with vegetating plants Chenopodium rubrum. FI by photoperiod and FS resulted in the emergence of new fractions of water, sharp changes in the content of one-and two-valent ions, characteristic distribution of F-actin filaments in AM cells. General regularities of WS and IH observed also during induction in long-day plants are considered in the discussion concerning the signal markers of the floral induction in photoperiodically sensitive plants.