Ovrutska I. Morphologic-anatomical description of leaves of air-water plants of Alisma plantago-aquatica L. and Sium latifolium L. under various conditions growth.

The results of researches on morphologic-anatomical alterations of sheet plates of air-water and terrestrial ecotypes of Alisma plantago-aquatica L. and of Sium latifolium L. plants in the phases of budding and flowering-fruiting in a natural environment at the conditions of different water supply are presented in the dissertation. The role of lignin is studied, as well as the role of heterospecific peroxidase and polysaccharide of callose in adaptation of air-water plants to the lack of moisture in soil. Influence of moderate water deficit on the morphologic-anatomical signs of sheets of the investigated plants, is set namely: a habitus of plant, sizes of sheets, cages, and also cellular mechanisms of changes without substantial alteration of anatomic organization. An ultrastructure of surface of epidermis, type and closeness of stomata on the epidermis of leaves sheets are species-specific signs regardless of ecotypes of the investigated plants. There is a correlation between changes of activity of heterospecific peroxidase and content of lignin in leave sheets of the investigated types of plants in dependence on the phase of ontogenesis and terms of growth. Variation in localization and size of activity of heterospecific peroxidase and content of lignin is inferior to general pathway of lignin synthesis in cell walls. Cytochemical studies have shown that callose is typical polysaccharide of cell wall for all tissues of sheet plates of Alisma plantago-aquatica L. and Sium latifolium L. in the phases of budding and flowering-fruiting regardless of the water regime. Сontent of callose in cell walls changes depending on tissue type, phase of ontogenesis and terms of growth of Alisma plantago-aquatica L. and Sium latifolium L. The cell walls of mesophyll and vessels contain the highest amount of callose. It testifies participation of this polysaccharide in the apoplasmatic transport of water via mesophyll and vessels regardless of type of plants.