Abstract
Carboxylase activities of the key enzyme of carbon metabolism, ribulose-bisphosphate carboxylase/oxygenase (RuBisCO; EC 4.1.1.39), and phosphoenolpyruvate carboxylase (PEPC; EC 4.1.1.31), as well as intensities of carbon dioxide photosynthetic assimilation in young seedlings and adult leaves of the wheat Triticum aestivum L. cultivars Mironovskaya 808 (a more tolerant) and Lyutestsens 758 (a less tolerant), were compared under conditions of progressive water deficiency. The water stress had more pronounced negative effects on all the studied characteristics of photosynthetic apparatus of cultivar Lyutestsens 758 photosynthetic machinery of the cultivar Lyutestsens 758. Its seedlings were more sensitive to water stress. Compounds with a cytokinin activity (6-benzylaminopurine, thidiazuron, cartolin 2, and cartolin 4) played a protective role, increasing the stability of the photosynthetic machinery under conditions of water deficiency. Preparations of cartolins displayed the maximum protective effect.
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