The leaf mesophyll cells ultrastructure and pigment content of heterophyllous aquatic plants Nuphar lutea (L.) Smith. and Nymphaea alba L. are reported. The ultrastructural differences of submerged and floating leaves were determined. Submerged leaf chloroplasts are located along the periclinal cell walls. They have significantly greater linear dimensions, contain grana with a large number of thylakoids, and have greater partial volume of photosynthetic membranes. The difference in the content of pigments in leaves was demonstrated: submerged leaves had the highest content of chlorophyll and carotenoids per unit of dry weight; floating leaves had the lowest one. The opposite trend was observed in the content of pigments per unit area. Based on the analysis of the obtained data and the literature data on the plasticity of the photosynthetic apparatus of plants, a model of underwater leaves adaptation to the aquatic environment was proposed.

Keywords: Nuphar lutea, Nymphaea alba, leaf, heterophylly, ultrastructure, pigments

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