An influence of drought stress on the dynamics of activities of ribulose 1.5-bisphosphate carboxylase/oxygenase (Rubisco) and carbonic anhydrase (CA) in bread and durum wheat genotypes differing in their drought tolerance and productivity was investigated under field conditions. Rubisco activity was primarily constant in plants with normal watering and subjected to drought, while it decreased at the duration of vegetation in all genotypes. CA activity increased during the first period of drought in flag leaves of drought resistance genotypes, but decreased at the last stage of vegetation. The activities of Rubisco and CA were lower in ear elements at an early stage in generative development than in flag leaves and decreased less in flag leaves under water stress.

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