Yordanov I. author Velikova V. author Tsonev T. author text journal article 2000 At the whole plant level, the effect of stress is usually perceived as a decrease in photosynthesis and growth. That is why this review is focused mainly on the effect of drought on photosynthesis, its injury, and mechanisms of adaptation. The analysed literature shows that plants have evolved a number of adaptive mechanisms that allow the photochemical and biochemical systems to cope with negative changes in environment, including increased water deficit. In addition, the acquisition of tolerance to drought includes both phenotypic and genotypic changes. The approaches were made to identify those metabolic steps that are most sensitive to drought. Some studies also examined the mechanisms controlling gene expression and putative regulatory pathways. chlorophyll; fluorescence induction; high temperature; net photosynthetic rate; photosystem 2; ribulose-1 5-bisphosphate carboxylase/oxygenase; stomatal conductance; water stress; water use efficiency; xanthophylls 10.1023/A:1007201411474 https://ps.ueb.cas.cz/artkey/phs-200002-0003.php https://ps.ueb.cas.cz/artkey/phs-200002-0003.php continuing 38 2 171 186 2000 03003604 periodical academic journal