Abstract
The effect of the atmospheric oxidant, peroxyacetyl nitrate (PAN) on photosynthetic phosphorylation, NADP plus reduction, and CO/sub 2/ fixation by chloroplasts prepared from spinach and bean plants has been studied. When this gaseous oxidant was passed through reaction mixtures in the light, inhibition of the photosynthetic reactions occurred. Inhibition in ATP and NADPH formation and the fixation of C-1402 was prevented by the addition of ascorbate to the reaction mixture. Also NADP plus reduction was maintained by adding either excess photosynthetic pyridine nucleotide reductase (PPNR) or heat inactivated PPNR preparations. Gassing the individual components, chloroplasts or PPNR in the light or dark prior to their use in a complete reaction, did not cause inhibition. 14 references, 1 figures, 8 tables.
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Claims 5
Claim · model-written summary
PAN inhibited photosynthetic reactions in chloroplasts from spinach and bean plants when passed through illuminated reaction mixtures.
- Taxon
- spinach and bean plantse0
- Treatment
- peroxyacetyl nitrate (PAN)e0
- Outcome
- photosynthetic reactionse0
- Direction
- inhibitione0
- Qualifier
- in the lighte0
Not reportedComparator
Verbatim
e0“The effect of the atmospheric oxidant, peroxyacetyl nitrate (PAN) on photosynthetic phosphorylation, NADP plus reduction, and CO/sub 2/ fixation by chloroplasts prepared from spinach and bean plants has been studied. When this gaseous oxidant was passed through reaction mixtures in the light, inhibition of the photosynthetic reactions occurred.”
Claim · model-written summary
Ascorbate prevented PAN inhibition of ATP and NADPH formation and carbon fixation.
- Taxon
- spinach and bean plantst0
- Treatment
- addition of ascorbatee0
- Outcome
- ATP and NADPH formation and the fixation of C-1402e0
- Direction
- preventede0
Not reportedComparator
Verbatim
e0“Inhibition in ATP and NADPH formation and the fixation of C-1402 was prevented by the addition of ascorbate to the reaction mixture.”
t0“spinach and bean plants”
Claim · model-written summary
Excess PPNR maintained NADP plus reduction.
- Taxon
- spinach and bean plantst0
- Treatment
- excess photosynthetic pyridine nucleotide reductase (PPNR)e0
- Gene
- photosynthetic pyridine nucleotide reductase (PPNR)e0
- Outcome
- NADP plus reductione0
- Direction
- maintainede0
Not reportedComparator
Verbatim
e0“Also NADP plus reduction was maintained by adding either excess photosynthetic pyridine nucleotide reductase (PPNR) or heat inactivated PPNR preparations.”
t0“spinach and bean plants”
Claim · model-written summary
Heat inactivated PPNR preparations maintained NADP plus reduction.
- Taxon
- spinach and bean plantst0
- Treatment
- heat inactivated PPNR preparationse0
- Outcome
- NADP plus reductione0
- Direction
- maintainede0
Not reportedComparator
Verbatim
e0“Also NADP plus reduction was maintained by adding either excess photosynthetic pyridine nucleotide reductase (PPNR) or heat inactivated PPNR preparations.”
t0“spinach and bean plants”
Claim · model-written summary
Prior light or dark gassing of individual chloroplasts or PPNR did not inhibit the complete reaction.
- Taxon
- spinach and bean plantst0
- Treatment
- Gassing the individual componentse0
- Outcome
- inhibitione0
- Direction
- did not causee0
Not reportedComparator
Verbatim
e0“Gassing the individual components, chloroplasts or PPNR in the light or dark prior to their use in a complete reaction, did not cause inhibition.”
t0“spinach and bean plants”
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