Abstract
Abstract Short periods of chilling in the presence of light (up to 6 h: 1°C; 270 W/m 2 ) decreased the subsequent apparent photosynthesis and chlorophyll fluorescence of leaf discs of Cucumis sativus L. cv. Kleine Groene Scherpe. The extent of the injury depended on the duration of the chilling pretreatment. After 6 h the subsequent apparent photosynthesis even reached a negative value, and it increased only slightly during the next 2 1/2 h. The decrease of apparent photosynthesis was not a consequence of increased dark respiration but was of photooxidative origin since the presence of both light and oxygen was required. Preincubation in the light for 2 h at 20°C sensitized leaf discs to subsequent photooxidation during chilling. Prompt and delayed chlorophyll fluorescence decreased simultaneously after chilling and light treatment. The corresponding decrease of photosynthesis and chlorophyll fluorescence is discussed in relation to primary photooxidative damage to the photosystems in the chloroplast membrane.
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Claims 7
Claim · model-written summary
Chilling in light decreased subsequent apparent photosynthesis.
- Taxon
- Cucumis sativus L.
Cucumis sativuse0 - Material
- Kleine Groene Scherpee0
- Organ / stage
- leaf discse0
- Treatment
- chilling in the presence of lighte0
- Outcome
- apparent photosynthesise0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short periods of chilling in the presence of light (up to 6 h: 1°C; 270 W/m 2 ) decreased the subsequent apparent photosynthesis and chlorophyll fluorescence of leaf discs of Cucumis sativus L. cv. Kleine Groene Scherpe.”
Claim · model-written summary
Chilling in light decreased chlorophyll fluorescence.
- Taxon
- Cucumis sativus L.Cucumis sativuse0
- Material
- Kleine Groene Scherpee0
- Organ / stage
- leaf discse0
- Treatment
- chilling in the presence of lighte0
- Outcome
- chlorophyll fluorescencee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short periods of chilling in the presence of light (up to 6 h: 1°C; 270 W/m 2 ) decreased the subsequent apparent photosynthesis and chlorophyll fluorescence of leaf discs of Cucumis sativus L. cv. Kleine Groene Scherpe.”
Claim · model-written summary
The extent of chilling injury depended on pretreatment duration.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- duration of the chilling pretreatmente0
- Outcome
- extent of the injurye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of the injury depended on the duration of the chilling pretreatment.”
e1“Cucumis sativus L. cv. Kleine Groene Scherpe”
Claim · model-written summary
After six hours of chilling, apparent photosynthesis became negative and recovered only slightly over the next 2.5 hours.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Outcome
- apparent photosynthesise0
- Direction
- negative valuee0
- Qualifier
- After 6 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 6 h the subsequent apparent photosynthesis even reached a negative value, and it increased only slightly during the next 2 1/2 h.”
e1“Cucumis sativus L. cv. Kleine Groene Scherpe”
Claim · model-written summary
Loss of apparent photosynthesis required light and oxygen and was attributed to photooxidation.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Outcome
- decrease of apparent photosynthesise0
- Qualifier
- photooxidative origine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease of apparent photosynthesis was not a consequence of increased dark respiration but was of photooxidative origin since the presence of both light and oxygen was required.”
e1“Cucumis sativus L. cv. Kleine Groene Scherpe”
Claim · model-written summary
Preincubation in light at 20°C sensitized leaf discs to chilling photooxidation.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- Preincubation in the light for 2 h at 20°Ce0
- Outcome
- subsequent photooxidatione0
- Direction
- sensitizede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preincubation in the light for 2 h at 20°C sensitized leaf discs to subsequent photooxidation during chilling.”
e1“Cucumis sativus L. cv. Kleine Groene Scherpe”
Claim · model-written summary
Prompt and delayed chlorophyll fluorescence decreased together following chilling and light.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- chilling and light treatmente0
- Outcome
- Prompt and delayed chlorophyll fluorescencee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Prompt and delayed chlorophyll fluorescence decreased simultaneously after chilling and light treatment.”
e1“Cucumis sativus L. cv. Kleine Groene Scherpe”
The same questions in other papers
cold · physiology: photosynthesis · Cucumis sativus (cucumber)Results differ
32 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- positive
- positive
35 papers more in this group
See all 39 papers →light · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
30 papers in the same direction as this paper · 30 in the opposite direction
- no effect
- positive
- positive
57 papers more in this group
See all 61 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.