Abstract
SummaryChanges in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C. Abilities of carbon dioxide fixation and oxygen release measured in dark-stored leaves, which were subsequently light-adapted prior to analysis, were still retained even after 14 d. However, changes in carbon dioxide fixation of leaves during the course of storage and senescence did not provide a realistic pattern of photosynthetic performance since this was influenced by the stomatal aperture of both light-stored and dark-stored leaves. Meanwhile, the photochemical quenching and energy-quenching values of the leaves seemed to be maintained under both light and dark conditions but decreased greatly soon after the onset of leaf yellowing. On the other hand, the maximal variable fluorescence of leaves decreased in both light and dark but was kept higher in the light than in the dark before the onset of yellowing. This could indicate that a part of the photosystems in the chloroplasts may have already been denatured even before leaf yellowing of the dark-stored leaves becomes visually apparent and that functional or structural disorder in the leaf tissues may have occurred during dark storage. This could further imply that the photosynthetic structure of spinach leaves during postharvest storage is ably supported by low intensity light until the onset of leaf yellowing.
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Claims 9
Claim · model-written summary
Carbon dioxide fixation and oxygen release of dark-stored spinach leaves were still retained after 14 days.
- Taxon
- spinach
Spinacia oleraceae1 - Organ / stage
- mature leavese1
- Treatment
- dark storage conditions at 8°Ce1
- Outcome
- carbon dioxide fixation and oxygen releasee2
- Direction
- still retainede2
- Qualifier
- even after 14 de2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e2“Abilities of carbon dioxide fixation and oxygen release measured in dark-stored leaves, which were subsequently light-adapted prior to analysis, were still retained even after 14 d”
Claim · model-written summary
Changes in carbon dioxide fixation of stored spinach leaves were influenced by stomatal aperture in both light-stored and dark-stored leaves.
- Taxon
- spinachSpinacia oleraceae1
- Outcome
- changes in carbon dioxide fixatione3
- Qualifier
- influenced by the stomatal aperturee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e3“changes in carbon dioxide fixation of leaves during the course of storage and senescence did not provide a realistic pattern of photosynthetic performance since this was influenced by the stomatal aperture of both light-stored and dark-stored leaves”
Claim · model-written summary
Photochemical quenching and energy-quenching values of spinach leaves seemed to be maintained under both light and dark conditions.
- Taxon
- spinachSpinacia oleraceae1
- Treatment
- both light and dark conditionse4
- Outcome
- photochemical quenching and energy-quenching valuese4
- Direction
- maintainede4
- Qualifier
- seemede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e4“Meanwhile, the photochemical quenching and energy-quenching values of the leaves seemed to be maintained under both light and dark conditions but decreased greatly soon after the onset of leaf yellowing”
Claim · model-written summary
Photochemical quenching and energy-quenching values of spinach leaves decreased greatly soon after the onset of leaf yellowing.
- Taxon
- spinachSpinacia oleraceae1
- Outcome
- photochemical quenching and energy-quenching valuese4
- Direction
- decreased greatlye4
- Qualifier
- soon after the onset of leaf yellowinge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e4“Meanwhile, the photochemical quenching and energy-quenching values of the leaves seemed to be maintained under both light and dark conditions but decreased greatly soon after the onset of leaf yellowing”
Claim · model-written summary
Maximal variable fluorescence of spinach leaves decreased in both light and dark storage.
- Taxon
- spinachSpinacia oleraceae1
- Outcome
- maximal variable fluorescencee5
- Direction
- decreasede5
- Qualifier
- in both light and darke5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e5“On the other hand, the maximal variable fluorescence of leaves decreased in both light and dark but was kept higher in the light than in the dark before the onset of yellowing”
Claim · model-written summary
Maximal variable fluorescence of spinach leaves was kept higher in the light than in the dark before yellowing.
- Taxon
- spinachSpinacia oleraceae1
- Treatment
- in the lighte5
- Outcome
- maximal variable fluorescencee5
- Direction
- kept highere5
- Qualifier
- before the onset of yellowinge5
- Comparator
- in the darke5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e5“On the other hand, the maximal variable fluorescence of leaves decreased in both light and dark but was kept higher in the light than in the dark before the onset of yellowing”
Claim · model-written summary
A part of the photosystems in spinach chloroplasts may already have been denatured before yellowing of dark-stored leaves.
- Taxon
- spinachSpinacia oleraceae1
- Outcome
- photosystems in the chloroplastse6
- Qualifier
- may have already been denaturede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e6“This could indicate that a part of the photosystems in the chloroplasts may have already been denatured even before leaf yellowing of the dark-stored leaves becomes visually apparent”
Claim · model-written summary
Functional or structural disorder in spinach leaf tissues may have occurred during dark storage.
- Taxon
- spinachSpinacia oleraceae1
- Outcome
- functional or structural disorder in the leaf tissuese7
- Qualifier
- during dark storagee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Changes in the photosynthetic abilities of mature leaves of stored spinach were studied under light (45 μmole m–2 s–1, popular strength in market showcases) or dark storage conditions at 8°C”
e7“functional or structural disorder in the leaf tissues may have occurred during dark storage”
Claim · model-written summary
Low intensity light until the onset of yellowing may support the photosynthetic structure of spinach leaves in postharvest storage.
- Taxon
- spinachSpinacia oleraceae7
- Outcome
- photosynthetic structuree7
- Qualifier
- supported by low intensity light until the onset of leaf yellowinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“This could further imply that the photosynthetic structure of spinach leaves during postharvest storage is ably supported by low intensity light until the onset of leaf yellowing”
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15 papers in the same direction as this paper · 13 in the opposite direction
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See all 29 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.