Abstract
To gain a physiological understanding of the effects of light intensity on the cucumber (Cucumis sativus L.), we subjected ‘Jinchun No. 5’ seedlings to shading treatment in three plots with light transmission of 100% (unshaded), 80%, and 60% in strong light periods for 45 days, and examined active oxygen species, senescence indicators and photosynthetic properties on the 15th, 30th, and 45th days of shading treatment respectively. The amounts of active oxygen species superoxide anions and hydrogen peroxide in leaves fell with decreasing light intensity on each of the 15th, 30th, and 45th days of shading treatment respectively. The amounts of chlorophyll and protein also decreased and that of malondialdehyde increased — all indicators of senescence — with decreasing light intensity on each of the 15th, 30th, and 45th days of shading treatment respectively. The photosynthetic property stomatal conductance in the 80% and 60% transmission plots exceeded that in the 100% transmission plot on the 15th and 30th days of shading treatment. No significant difference was seen in sub-stomatal CO2 concentration between all three light transmission plots. Both transpiration and net photosynthesis rates rose with decreasing light intensity. These results suggest that the shading treatment during strong light periods may suppress the generation and accumulation of active oxygen species, inhibit senescence and also ameliorate photosynthesis in cucumber ‘Jinchun No. 5’ seedlings.
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Claims 6
Claim · model-written summary
Leaf superoxide anion and hydrogen peroxide amounts fell with decreasing light intensity compared with unshaded plants.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- leavese1
- Treatment
- decreasing light intensitye1
- Outcome
- amounts of active oxygen species superoxide anions and hydrogen peroxidee1
- Direction
- felle1
- Comparator
- unshadede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“The amounts of active oxygen species superoxide anions and hydrogen peroxide in leaves fell with decreasing light intensity”
e2“100% (unshaded)”
Claim · model-written summary
Chlorophyll and protein amounts decreased with decreasing light intensity compared with unshaded plants.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- amounts of chlorophyll and proteine1
- Direction
- decreasede1
- Comparator
- unshadede2
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“The amounts of chlorophyll and protein also decreased”
e2“100% (unshaded)”
Claim · model-written summary
Malondialdehyde amount increased with decreasing light intensity compared with unshaded plants.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- malondialdehydee1
- Direction
- increasede1
- Comparator
- unshadede2
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“that of malondialdehyde increased”
e2“100% (unshaded)”
Claim · model-written summary
Stomatal conductance in the 80% and 60% transmission plots exceeded that in the 100% transmission plot on the 15th and 30th days of shading.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- 80% and 60% transmission plotse1
- Outcome
- stomatal conductancee1
- Direction
- exceedede1
- Qualifier
- 15th and 30th days of shading treatmente1
- Comparator
- 100% transmission plote1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“stomatal conductance in the 80% and 60% transmission plots exceeded that in the 100% transmission plot on the 15th and 30th days of shading treatment”
Claim · model-written summary
No significant difference in sub-stomatal CO2 concentration was seen between the three light transmission plots.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- all three light transmission plotse1
- Outcome
- sub-stomatal CO2 concentratione1
- Direction
- No significant differencee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“No significant difference was seen in sub-stomatal CO2 concentration between all three light transmission plots”
Claim · model-written summary
Transpiration and net photosynthesis rates rose with decreasing light intensity.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- decreasing light intensitye1
- Outcome
- transpiration and net photosynthesis ratese1
- Direction
- rosee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Both transpiration and net photosynthesis rates rose with decreasing light intensity”
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