Photosynthesis is particularly sensitive to effects of
water deficiency and increased temperature. Even a
small decrease in the water potential of a plant causes
its stomata to close, which entails ëé2 deficiency in
photosynthesizing tissues and decreases the intensity of
photosynthetic assimilation of CO2 (which is the integral
parameter of the process). As the degree of hydration
of the tissues decreases, the photosynthetic apparatus
of plants undergoes functional changes, which further
develop into disruption of its structure