Abstract
Taking a relatively heat-resistant cucumber (Cucumis sativus) cultivar 'Jinchun No. 4' as test material, a sand culture experiment was conducted in growth chamber to investigate the effects of foliar spraying spermidine (Spd) on the lipid peroxidation, membrane proton pump activity, and corresponding gene expression of cucumber seedling leaves under high temperature stress. Compared with the control, foliar spraying Spd increased the plant height, stem diameter, dry and fresh mass, and leaf area significantly, and inhibited the increase of leaf relative conductivity, malondialdehyde (MDA) content, and lipoxygenase (LOX) activity effectively. Foliar spraying Spd also helped to the increase of leaf plasma membrane- and tonoplast H(+)-ATPase activity, but no significant difference was observed in the gene expression levels. These results suggested that exogenous Spd could significantly decrease the leaf lipid peroxidation and increase the proton pump activity, and thus, stabilize the leaf membrane structure and function, alleviate the damage induced by high temperature stress, and enhance the heat tolerance of cucumber seedlings.
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Claims 4
Claim · model-written summary
Spermidine significantly increased cucumber plant height, stem diameter, masses and leaf area.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- foliar spraying Spde0
- Outcome
- plant height, stem diameter, dry and fresh mass, and leaf areae0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the control, foliar spraying Spd increased the plant height, stem diameter, dry and fresh mass, and leaf area significantly”
t0“cucumber”
Claim · model-written summary
Spermidine inhibited increases in cucumber leaf conductivity, MDA content and LOX activity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- foliar spraying Spde0
- Gene
- lipoxygenase (LOX)e0
- Outcome
- leaf relative conductivity, malondialdehyde (MDA) content, and lipoxygenase (LOX) activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar spraying Spd increased the plant height, stem diameter, dry and fresh mass, and leaf area significantly, and inhibited the increase of leaf relative conductivity, malondialdehyde (MDA) content, and lipoxygenase (LOX) activity effectively.”
t0“cucumber”
Claim · model-written summary
Spermidine helped increase leaf plasma membrane and tonoplast H(+)-ATPase activity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Foliar spraying Spde0
- Gene
- H(+)-ATPasee0
- Outcome
- leaf plasma membrane- and tonoplast H(+)-ATPase activitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar spraying Spd also helped to the increase of leaf plasma membrane- and tonoplast H(+)-ATPase activity, but no significant difference was observed in the gene expression levels.”
t0“cucumber”
Claim · model-written summary
Spermidine did not significantly alter gene expression levels.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Foliar spraying Spde0
- Outcome
- gene expression levelse0
- Direction
- no significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar spraying Spd also helped to the increase of leaf plasma membrane- and tonoplast H(+)-ATPase activity, but no significant difference was observed in the gene expression levels.”
t0“cucumber”
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