Abstract
A water culture experiment with 1/2 Hoagland solution was carried out to study the effects of exogenous 24-epibrassinolide (EBR) on the leaf photosynthetic characteristics and polyamines (PAs) content of cucumber seedlings under hypoxia stress. Under the stress, the leaf net photosynthetic rate (Pn), stomatal conductance (g(s)), transpiration rate (Tr), and intercellular CO2 concentration (Ci) decreased significantly while the chlorophyll content was in adverse, and the seedling growth was inhibited. Hypoxia stress increased the leaf Put, Spd, and Spm contents and Put/PAs ratio significantly, but decreased the (Spd+Spm)/Put. Under the stress, exogenous EBR not only increased the Pn, g(s), Tr, and chlorophyll content significantly, but also increased the contents of free Spm, conjugated Spd and Spm, and bound Put, Spd, and Spm significantly. Meanwhile, the PAs content and (Spd + Spm)/Put ratio were further increased, and the Put/PAs ratio decreased. The results suggested that exogenous EBR could regulate the formation and form transformation of PAs in cucumber seedling leaf, made the leaf keep a higher photosynthetic performance, promote the increase of leaf area and dry mass, and alleviate the damage of hypoxia stress.
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Claims 16
Claim · model-written summary
Hypoxia significantly reduced Pn, stomatal conductance and transpiration.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- hypoxia stresse1
- Outcome
- leaf net photosynthetic rate (Pn), stomatal conductance (g(s)), transpiration rate (Tr)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the stress, the leaf net photosynthetic rate (Pn), stomatal conductance (g(s)), transpiration rate (Tr), and intercellular CO2 concentration (Ci) decreased significantly”
t0“cucumber”
e1“cucumber seedlings under hypoxia stress”
Claim · model-written summary
Hypoxia significantly reduced intercellular CO2 concentration.
- Taxon
- cucumberCucumis sativust0
- Treatment
- hypoxia stresse1
- Outcome
- intercellular CO2 concentration (Ci)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercellular CO2 concentration (Ci) decreased significantly”
t0“cucumber”
e1“cucumber seedlings under hypoxia stress”
Claim · model-written summary
Hypoxia increased chlorophyll content.
- Taxon
- cucumberCucumis sativust0
- Treatment
- hypoxia stresse1
- Outcome
- chlorophyll contente0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased significantly while the chlorophyll content was in adverse”
t0“cucumber”
e1“cucumber seedlings under hypoxia stress”
Claim · model-written summary
Hypoxia inhibited seedling growth.
- Taxon
- cucumberCucumis sativust0
- Treatment
- hypoxia stresse1
- Outcome
- seedling growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the seedling growth was inhibited.”
t0“cucumber”
e1“cucumber seedlings under hypoxia stress”
Claim · model-written summary
Hypoxia significantly increased leaf Put, Spd and Spm contents.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Hypoxia stresse0
- Outcome
- leaf Put, Spd, and Spm contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hypoxia stress increased the leaf Put, Spd, and Spm contents and Put/PAs ratio significantly, but decreased the (Spd+Spm)/Put.”
t0“cucumber”
Claim · model-written summary
Hypoxia significantly increased Put/PAs ratio.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Hypoxia stresse0
- Outcome
- Put/PAs ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hypoxia stress increased the leaf Put, Spd, and Spm contents and Put/PAs ratio significantly, but decreased the (Spd+Spm)/Put.”
t0“cucumber”
Claim · model-written summary
Hypoxia decreased (Spd+Spm)/Put.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Hypoxia stresse0
- Outcome
- (Spd+Spm)/Pute0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hypoxia stress increased the leaf Put, Spd, and Spm contents and Put/PAs ratio significantly, but decreased the (Spd+Spm)/Put.”
t0“cucumber”
Claim · model-written summary
Under hypoxia EBR significantly increased Pn, conductance and transpiration.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous EBRe0
- Outcome
- Pn, g(s), Tre0
- Direction
- increasede0
- Qualifier
- Under the stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the stress, exogenous EBR not only increased the Pn, g(s), Tr, and chlorophyll content significantly”
t0“cucumber”
Claim · model-written summary
Under hypoxia EBR significantly increased chlorophyll.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous EBRe0
- Outcome
- chlorophyll contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the stress, exogenous EBR not only increased the Pn, g(s), Tr, and chlorophyll content significantly”
t0“cucumber”
Claim · model-written summary
EBR significantly increased free Spm and conjugated Spd and Spm.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous EBRe1
- Outcome
- free Spm, conjugated Spd and Spme0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but also increased the contents of free Spm, conjugated Spd and Spm, and bound Put, Spd, and Spm significantly.”
e1“Under the stress, exogenous EBR”
t0“cucumber”
Claim · model-written summary
EBR significantly increased bound Put, Spd and Spm.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous EBRe1
- Outcome
- bound Put, Spd, and Spme0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but also increased the contents of free Spm, conjugated Spd and Spm, and bound Put, Spd, and Spm significantly.”
e1“Under the stress, exogenous EBR”
t0“cucumber”
Claim · model-written summary
EBR further increased PAs content and (Spd + Spm)/Put ratio.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous EBRe1
- Outcome
- PAs content and (Spd + Spm)/Put ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Meanwhile, the PAs content and (Spd + Spm)/Put ratio were further increased, and the Put/PAs ratio decreased.”
e1“Under the stress, exogenous EBR”
t0“cucumber”
Claim · model-written summary
EBR decreased Put/PAs ratio.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous EBRe1
- Outcome
- Put/PAs ratioe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Meanwhile, the PAs content and (Spd + Spm)/Put ratio were further increased, and the Put/PAs ratio decreased.”
e1“Under the stress, exogenous EBR”
t0“cucumber”
Claim · model-written summary
EBR could regulate polyamine formation and form transformation in cucumber leaves.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- exogenous EBRe0
- Outcome
- formation and form transformation of PAse0
- Qualifier
- coulde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous EBR could regulate the formation and form transformation of PAs in cucumber seedling leaf”
Claim · model-written summary
EBR could maintain higher photosynthetic performance and promote leaf area and dry mass increases.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- exogenous EBRe0
- Outcome
- leaf area and dry masse0
- Direction
- increasee0
- Qualifier
- higher photosynthetic performancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous EBR could regulate the formation and form transformation of PAs in cucumber seedling leaf, made the leaf keep a higher photosynthetic performance, promote the increase of leaf area and dry mass, and alleviate the damage of hypoxia stress.”
Claim · model-written summary
EBR could alleviate hypoxia damage.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- exogenous EBRe0
- Outcome
- damage of hypoxia stresse0
- Direction
- alleviatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous EBR could regulate the formation and form transformation of PAs in cucumber seedling leaf, made the leaf keep a higher photosynthetic performance, promote the increase of leaf area and dry mass, and alleviate the damage of hypoxia stress.”
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