Abstract
ABSTRACT Effects of silicon (Si) application on photosynthesis of solution-cultured cucumber seedlings were investigated under osmotic stress and unstressed conditions. In unstressed conditions, silicon application had no effect on growth and photosynthetic parameters. The responses of the photosynthetic parameters to abruptly imposed osmotic stress did not differ between silicon treatments. After 1 week exposure to osmotic stress, growth reduction was observed, but it was less severe in seedlings grown with silicon than in those without silicon. Although there were no differences between silicon treatments in stomatal conductance, transpiration rate, cuticular transpiration, or xylem sap exudation rate under osmotic stress, leaf intercellular carbon dioxide (CO2) concentration was significantly lower and photosynthetic rate tended to be higher in seedlings supplied with silicon. These results suggested that the silicon-induced alleviation of growth reduction under osmotic stress in cucumber was due to amelioration of stress-induced damage of leaf tissues rather than to improvement of leaf water status. Keywords: Cucumis sativus L.osmotic stressphotosynthesissilicon ACKNOWLEDGMENTS This study was supported by a grant for the 21st Century Center of Excellence program from the Japan Society for the Promotion of Science. Notes ∗ P < 0.05, ∗∗∗ P < 0.001, N.S. not significant, based on ANOVA. ∗ P < 0.05, ∗∗∗ P < 0.001, N.S. not significant, based on ANOVA.
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Claims 8
Claim · model-written summary
Silicon application had no effect on growth and photosynthetic parameters of unstressed cucumber seedlings.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- silicon applicatione0
- Outcome
- growth and photosynthetic parameterse0
- Direction
- no effecte0
- Qualifier
- unstressed conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In unstressed conditions, silicon application had no effect on growth and photosynthetic parameters”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Responses of photosynthetic parameters to abruptly imposed osmotic stress did not differ between silicon treatments.
- Taxon
- cucumberCucumis sativust0
- Treatment
- abruptly imposed osmotic stresse0
- Outcome
- responses of the photosynthetic parameterse0
- Direction
- did not differe0
- Comparator
- silicon treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The responses of the photosynthetic parameters to abruptly imposed osmotic stress did not differ between silicon treatments”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Silicon made osmotic-stress growth reduction in cucumber seedlings less severe than without silicon.
- Taxon
- cucumberCucumis sativust0
- Treatment
- osmotic stresse0
- Outcome
- growth reductione0
- Direction
- less severee0
- Comparator
- without silicone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 1 week exposure to osmotic stress, growth reduction was observed, but it was less severe in seedlings grown with silicon than in those without silicon”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Leaf intercellular CO2 concentration was significantly lower in cucumber seedlings supplied with silicon.
- Taxon
- cucumberCucumis sativust0
- Treatment
- silicone0
- Outcome
- leaf intercellular carbon dioxide (CO2) concentratione0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf intercellular carbon dioxide (CO2) concentration was significantly lower and photosynthetic rate tended to be higher in seedlings supplied with silicon”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Photosynthetic rate tended to be higher in cucumber seedlings supplied with silicon.
- Taxon
- cucumberCucumis sativust0
- Treatment
- silicone0
- Outcome
- photosynthetic ratee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf intercellular carbon dioxide (CO2) concentration was significantly lower and photosynthetic rate tended to be higher in seedlings supplied with silicon”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Under osmotic stress, there were no differences between silicon treatments in stomatal conductance, transpiration rate or cuticular transpiration.
- Taxon
- cucumberCucumis sativust0
- Treatment
- osmotic stresse0
- Outcome
- stomatal conductance, transpiration rate, cuticular transpiratione0
- Direction
- no differencese0
- Comparator
- silicon treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although there were no differences between silicon treatments in stomatal conductance, transpiration rate, cuticular transpiration, or xylem sap exudation rate under osmotic stress”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Under osmotic stress, there was no difference between silicon treatments in xylem sap exudation rate.
- Taxon
- cucumberCucumis sativust0
- Treatment
- osmotic stresse0
- Outcome
- xylem sap exudation ratee0
- Direction
- no differencese0
- Comparator
- silicon treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although there were no differences between silicon treatments in stomatal conductance, transpiration rate, cuticular transpiration, or xylem sap exudation rate under osmotic stress”
t0“Young Cucumber Seedlings”
Claim · model-written summary
Silicon alleviated osmotic-stress growth reduction in cucumber by ameliorating leaf tissue damage rather than by improving leaf water status.
- Taxon
- cucumberCucumis sativust0
- Treatment
- silicone0
- Outcome
- alleviation of growth reductione0
- Qualifier
- amelioration of stress-induced damage of leaf tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggested that the silicon-induced alleviation of growth reduction under osmotic stress in cucumber was due to amelioration of stress-induced damage of leaf tissues rather than to improvement of leaf water status”
t0“Young Cucumber Seedlings”
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