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- W4207072703 abstract "Abstract Plants use ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) to fix CO2 during photosynthesis. RuBisCO also reacts with O2, lowering productivity through inevitable photorespiration and increasing the CO2 compensation point of C3 plants to 50 to 70 bar. The Km value for CO2 of RuBisCO is 10 to 15 μM and CO2 activation is necessary for activity (Roy and Andrews, 2000). Diffusion barriers to CO2 in the stomata, plasma membranes, cytosolic fluid and chloroplast envelopes lower CO2 concentrations around RuBisCO to approximately 7 μM during active photosynthesis (von Caemmerer and Evans, 1991; Noctor et al., 2002), even with the aid of aquaporins for quick diffusion at plasma membranes (Terashima and Ono, 2002; Uehlein et al., 2003). Consequently, less than 20% of all RuBisCO catalytic sites actually participate in photosynthetic CO2 fixation in chloroplasts (McCurry et al., 1981). Nevertheless, plants fix a total of 200 Gtons of CO2 every year by investing a large amount of nitrogen in RuBisCO synthesis and by maximizing the density of stomata per leaf unit area and the size of stomatal apertures (Terashima et al., 2005)." @default.
- W4207072703 created "2022-01-26" @default.
- W4207072703 creator A5024029677 @default.
- W4207072703 creator A5060352866 @default.
- W4207072703 creator A5077963842 @default.
- W4207072703 date "2006-01-11" @default.
- W4207072703 modified "2023-10-15" @default.
- W4207072703 title "WATER STRESS" @default.
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