Abstract
The relative roles of assimilatory and photorespiratory electron flows on one side and of the Mehler‐peroxidase pathway on the other side in sustaining electron transport and providing protection against photoinhibition were investigated in leaves of spinach ( Spinacia oleracea L.) and sunflower ( Helianthus annuus L.). After inhibiting photosynthesis and photorespiration of intact leaves by either HCN or glycolaldehyde, light‐dependent linear electron transport was decreased by more than 90% at a photon flux density of 800 µmol m −2 s −1 . Remaining electron transport exhibited characteristics of the Mehler reaction. Nonphotochemical quenching of chlorophyll fluorescence increased after inhibition of CO 2 assimilation and photorespiration indicating effective dissipation of excess excitation energy. Nevertheless, appreciable photoinactivation was observed under these conditions not only of photosystem II but also of photosystem I. This damage was oxygen‐dependent. It was much reduced or absent when the oxygen concentration of the atmosphere was reduced from 21 to 1%.
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Claims 5
Claim · model-written summary
Inhibited photosynthesis and photorespiration reduced linear electron transport by more than 90%.
- Taxon
- spinach
Spinacia oleraceae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of spinach ( Spinacia oleracea L.) and sunflower ( Helianthus annuus L.)”
e1“After inhibiting photosynthesis and photorespiration of intact leaves by either HCN or glycolaldehyde, light‐dependent linear electron transport was decreased by more than 90% at a photon flux density of 800 µmol m −2 s −1”
Claim · model-written summary
Remaining transport exhibited Mehler reaction characteristics.
- Taxon
- spinachSpinacia oleraceae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Remaining electron transport exhibited characteristics of the Mehler reaction”
e1“leaves of spinach ( Spinacia oleracea L.) and sunflower ( Helianthus annuus L.)”
Claim · model-written summary
Inhibition increased nonphotochemical quenching of chlorophyll fluorescence.
- Taxon
- spinachSpinacia oleraceae0e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nonphotochemical quenching of chlorophyll fluorescence increased after inhibition of CO 2 assimilation and photorespiration”
e1“leaves of spinach ( Spinacia oleracea L.) and sunflower ( Helianthus annuus L.)”
Claim · model-written summary
Photoinactivation affected photosystem II under inhibited assimilation and photorespiration.
- Taxon
- spinachSpinacia oleraceae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“appreciable photoinactivation was observed under these conditions not only of photosystem II but also of photosystem I”
e1“leaves of spinach ( Spinacia oleracea L.) and sunflower ( Helianthus annuus L.)”
Claim · model-written summary
Photoinactivation was oxygen-dependent and was reduced or absent at 1% versus 21% oxygen.
- Taxon
- spinachSpinacia oleraceae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This damage was oxygen‐dependent. It was much reduced or absent when the oxygen concentration of the atmosphere was reduced from 21 to 1%”
e1“leaves of spinach ( Spinacia oleracea L.) and sunflower ( Helianthus annuus L.)”
The same questions in other papers
co2 · physiology: photosynthesis · Spinacia oleracea (spinach)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.