Cytomorphology of the wound healing process in the green filamentous algae, Ulothrix zonata (F. Weber & Mohr) K tzing 1833

Abstract. For the first time, we present a cytomorphological description of self-healing (repair) process damaged thalli sites, wound healing , in green filamentous algae, Ulothrix zonata (F. Weber & Mohr) K tzing 1833. In filaments this species from Lake Baikal and Angara (Baikal outflow), Zhilishche inflow) Ida (Angara rivers, light microscopy methods revealed dome-like conical protrusions elongations transverse cell walls directed into adjacent dead (without protoplast) defective (with deformed chloroplasts) cells. At same there were mostly patterns where two cells formed filament site between them, i.e. towards each other. The growth previously unconnected other led to their convergence adjacency. This had important physiological consequences that ensured restoration integrity. consequence was formation intercellular junctions. second one fusion protoplasts nuclei (cell fusion) with vegetative polyploid increased size. During subsequent divisions these cells, extended areas emerged two- three-fold increase diameter algal filaments. It also found promoted development giant hypnospores. We showed H-shaped septa algae not thickenings outer but sheaths preserved after reparation process. Analysis did migrate polarized regions retained central position, which testifies fixation protoplast. observed sporadic cases lateral U. due self-repair division during . A comparison various deformations allowed us determine characteristic stages zonata, have some similarities differences those marine red algae. Our study indicates is an evolutionarily developed genetically programmed adaptation may be widespread population