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- W2034779733 abstract "In order to study the relative contributions of the autocatalytic increase in the level of substrates and the light activation of enzymes to the control of the induction phase or “lag” in wheat chloroplasts, we measured the light-induced reductive activation of fructose 1,6-bisphosphatase, phosphoglycerate kinase, NADP+-dependent glyceraldehyde-phosphate dehydrogenase, ribulose 1,5-bisphosphate carboxylase, and phosphoribulokinase in isolated chloroplasts. Each was rapidly activated to levels more than adequate to support the maximum rate of photosynthesis. Induction in wheat chloroplasts is characterized by a period of about 1 min during which no O2 is evolved. If small quantities of intermediates such as dihydroxyacetone phosphate (DHAP) or 3-phosphoglycerate (PGA) are added, maximum rates of photosynthesis are achieved within the first minute of illumination. The presence of PGA did not affect the activation of any of the above-mentioned enzymes. Each of the enzymes was therefore capable of sustaining maximum rates of photosynthesis in the presence of PGA, even though there was no O2 evolution from those chloroplasts incubated with CO2 alone as substrate. The inclusion of PGA did not give rise to abnormally high levels of DHAP, FBP, or fructose 6-phosphate in the stroma. We conclude that the levels of substrates or cofactors are the principal, if not the sole, determinants of the rate of photosynthetic carbon assimilation during induction in wheat chloroplasts." @default.
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- W2034779733 date "1980-04-01" @default.
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- W2034779733 title "Autocatalysis and light activation of enzymes in relation to photosynthetic induction in wheat chloroplasts" @default.
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- W2034779733 doi "https://doi.org/10.1016/0003-9861(80)90389-6" @default.
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