The most frequent stress effect experienced by
plants and their photosynthetic apparatus is water defi-
ciency. The greenhouse effect (which becomes more
and more pronounced), increased evaporation and
reduction of water basins, elevation of mean annual
temperature, and augmented contamination of the
atmosphere by anthropogenic microadulterants (first of
all, methane and oxides of carbon and nitrogen) [5, 6]
may disrupt gas exchange, dark and light reactions of
photosynthesis [7–9], and the unified hydrodynamic
system of water supply, transport, and transpiration,
which ensures normal water homeostasis in plants