Abstract
To make clear the influence of ALA on cucumber photosynthesis under suboptimal temperature(18 ℃/12 ℃)and light intensity(300 μmol·m-2·s-1),0.5 mg·L-1 ALA was applied by spraying,and the gas exchange parameters,chlorophyll fluorescence parameters,activities of RuBPCase and FDPase were investigated.The results showed that suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci).Furthermore,compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP).while application of 0.5 mg·L-1 ALA increased the Pn.Gs,CE,AQY,ΦPSⅡ,qP,Fv'/Fm',and activities of RuBPCase and FDPase,decreased the Ci,LCP and CCP of cucumber seedlings under suboptimal temperature and light intensity.These data suggested that non-stomatal limitation was the main cause of the decrease of Pn,ALA played a positive role in alleviating the effect of suboptimal temperature and light intensity on photosynthesis of cucumber seedlings.
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Claims 11
Claim · model-written summary
Suboptimal temperature and light reduced cucumber seedling net photosynthetic rate, stomatal conductance and carboxylation efficiency.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- suboptimal temperature and light intensitye0
- Outcome
- net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE)e0
- Direction
- decreasede0
- Comparator
- normal temperature and light intensitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY)”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
Suboptimal conditions reduced apparent quantum yield and actual PSII photochemical efficiency.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- suboptimal temperature and light intensitye1
- Outcome
- apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ)e0
- Direction
- decreasede0
- Comparator
- normal temperature and light intensitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ)”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
Suboptimal conditions reduced photochemical quenching, antenna transformation efficiency, and RuBPCase and FDPase activities.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- suboptimal temperature and light intensitye1
- Outcome
- photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPasee0
- Direction
- decreasede1
- Comparator
- normal temperature and light intensitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
Suboptimal conditions increased intercellular CO2 concentration.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- suboptimal temperature and light intensitye1
- Outcome
- intercellular CO2 concentration(Ci)e0
- Direction
- increasede0
- Comparator
- normal temperature and light intensitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the intercellular CO2 concentration(Ci)”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
Suboptimal conditions significantly decreased light and CO2 compensation points.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- suboptimal temperature and light intensitye0
- Outcome
- light compensation point(LCP)and CO2 compensation point(CCP)e0
- Direction
- decreasee0
- Comparator
- normal temperature and light intensitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
ALA increased photosynthetic rate, stomatal conductance and carboxylation efficiency under suboptimal conditions.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- 0.5 mg·L-1 ALAe0
- Outcome
- Pn.Gs,CEe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of 0.5 mg·L-1 ALA increased the Pn.Gs,CE,AQY,ΦPSⅡ,qP,Fv'/Fm',and activities of RuBPCase and FDPase”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
ALA increased apparent quantum yield, actual PSII efficiency and photochemical quenching under suboptimal conditions.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- 0.5 mg·L-1 ALAe0
- Outcome
- AQY,ΦPSⅡ,qPe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of 0.5 mg·L-1 ALA increased the Pn.Gs,CE,AQY,ΦPSⅡ,qP,Fv'/Fm',and activities of RuBPCase and FDPase”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
ALA increased antenna transformation efficiency and RuBPCase and FDPase activities under suboptimal conditions.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- 0.5 mg·L-1 ALAe0
- Outcome
- Fv'/Fm',and activities of RuBPCase and FDPasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of 0.5 mg·L-1 ALA increased the Pn.Gs,CE,AQY,ΦPSⅡ,qP,Fv'/Fm',and activities of RuBPCase and FDPase”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
ALA decreased intercellular CO2 concentration and light and CO2 compensation points under suboptimal conditions.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- 0.5 mg·L-1 ALAe3
- Outcome
- Ci,LCP and CCPe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased the Ci,LCP and CCP of cucumber seedlings under suboptimal temperature and light intensity”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
e3“application of 0.5 mg·L-1 ALA increased the Pn.Gs,CE,AQY,ΦPSⅡ,qP,Fv'/Fm',and activities of RuBPCase and FDPase”
Claim · model-written summary
Authors inferred nonstomatal limitation was the main cause of decreased photosynthetic rate under suboptimal conditions.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- decrease of Pne0
- Qualifier
- non-stomatal limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-stomatal limitation was the main cause of the decrease of Pn”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
Claim · model-written summary
Authors interpreted ALA as alleviating adverse suboptimal-condition effects on seedling photosynthesis.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- ALAe0
- Outcome
- photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ALA played a positive role in alleviating the effect of suboptimal temperature and light intensity on photosynthesis of cucumber seedlings”
e1“suboptimal temperature and light intensity decreased the net photosynthetic rate(Pn),stomatal conductance(Gs),carboxylation efficiency(CE),apparent quantum yield(AQY),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photochemical quenching(qP),antenna transformation efficiency(Fv'/Fm'),and activities of RuBPCase and FDPase of cucumber seedlings,but increased the intercellular CO2 concentration(Ci)”
e2“compared with the normal temperature and light intensity,suboptimal temperature and light intensity led to significant decrease in the light compensation point(LCP)and CO2 compensation point(CCP)”
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