ACTIVITY OF THE NADP-REDUCING SYSTEM AND RIBULOSE-BISPHOSPHATE CARBOXYLASE IN ONTOGENY OF THE WHEAT FLAG LEAF

We investigated the potential for formation of the reducing agent NADP H and rubisco activity in leaf of two cultivars of wheat (Triticum aes tivum L.) with different productivity. It is demonstrated that changes occur in activity of the NADP-reducing system and rubisco during the process of leaf development. Changes are also clarified in the content of chlorophyll, ferredoxin, plastocyanin, ferrodoxin-NAD(P)H oxidored uctase, and rubisco, in the number of PSI reaction centers; and in the ir ratio. It is hypothesized that unidirectional quantitative changes in content of thylakoid membrane components on the terminal sector of the electron transport chain and content of rubisco constitute the bas is of regulation of the coupled processes of reducing agent formation and CO2 assimilation in the chloroplasts.