Abstract
The effects of grafting on the photosynthesis and CO2 assimilation were studied with salt-tolerant pumpkin(Cucurbita maxima×Cucurbita moschata)'Qingzhen 1'as the rootstock and a cultivar cucumber'Jinyou 3'as the scion under iso-osmotic Ca(NO3)2 or NaCl stress.Results showed that the photosynthetic pigment content,net photosynthetic rate(Pn),the stomatal conductance(Gs),water use efficiency(WUE),the actual photochemical efficiency of photosystemⅡ(ΦPSⅡ),the photochemical quenching(qP),the content and activity of Rubisco,the expression of key genes of carbon assimilation in leaves of both rootstock-grafted and self-grafted seedlings were higher under Ca(NO3)2 stress than those of under NaCl stress.Intercellular CO2 concentration(Ci)was decreased by the Ca(NO3)2 treatment,while was increased by the NaCl treatment.The decline of Pn in seedlings was due to the decreased Rubisco activity under NaCl stress.The photosynthetic pigment content,Pn,Gs,Ci,WUE,ΦPSⅡ,qP,Rubisco activity and content in rootstock-grafted seedlings were more higher than those of self-grafted seedlings under iso-osmotic Ca(NO3)2 or NaCl stress.And the genes of RbcL(Rubisco large subunit),RCA(Rubisco activase)and PRK(5-phosphoribulokinase)were also up-regulated while RbcS(Rubisco small subunit)was down regulated by rootstock-grafted under salt stress.We concluded that grafting with salt-tolerant pumpkin could maintain higher activity of PSⅡand carbon assimilation capacity.
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Claims 13
Claim · model-written summary
Under calcium nitrate stress, grafted cucumber had higher photosynthetic pigments, photosynthetic rate and stomatal conductance than under sodium chloride stress.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- Ca(NO3)2 stresse1
- Outcome
- photosynthetic pigment content,net photosynthetic rate(Pn),the stomatal conductance(Gs)e0
- Direction
- highere1
- Comparator
- NaCl stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic pigment content,net photosynthetic rate(Pn),the stomatal conductance(Gs)”
e1“were higher under Ca(NO3)2 stress than those of under NaCl stress”
t0“cucumber”
Claim · model-written summary
Calcium nitrate stress gave higher water use efficiency and PSII photochemical efficiency and quenching than sodium chloride stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca(NO3)2 stresse1
- Outcome
- water use efficiency(WUE),the actual photochemical efficiency of photosystemⅡ(ΦPSⅡ),the photochemical quenching(qP)e0
- Direction
- highere1
- Comparator
- NaCl stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency(WUE),the actual photochemical efficiency of photosystemⅡ(ΦPSⅡ),the photochemical quenching(qP)”
e1“were higher under Ca(NO3)2 stress than those of under NaCl stress”
t0“cucumber”
Claim · model-written summary
Calcium nitrate stress gave higher Rubisco content and activity than sodium chloride stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca(NO3)2 stresse1
- Gene
- Rubiscoe0
- Outcome
- content and activity of Rubiscoe0
- Direction
- highere1
- Comparator
- NaCl stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content and activity of Rubisco”
e1“were higher under Ca(NO3)2 stress than those of under NaCl stress”
t0“cucumber”
Claim · model-written summary
Carbon assimilation gene expression was higher under calcium nitrate than sodium chloride stress.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leavese0
- Treatment
- Ca(NO3)2 stresse1
- Outcome
- expression of key genes of carbon assimilatione0
- Direction
- highere1
- Comparator
- NaCl stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the expression of key genes of carbon assimilation in leaves”
e1“were higher under Ca(NO3)2 stress than those of under NaCl stress”
t0“cucumber”
Claim · model-written summary
Calcium nitrate decreased intercellular CO2 concentration.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca(NO3)2 treatmente0
- 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)was decreased by the Ca(NO3)2 treatment”
t0“cucumber”
Claim · model-written summary
Sodium chloride increased intercellular CO2 concentration.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NaCl treatmente0
- Outcome
- Intercellular CO2 concentration(Ci)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercellular CO2 concentration(Ci)was decreased by the Ca(NO3)2 treatment,while was increased by the NaCl treatment”
t0“cucumber”
Claim · model-written summary
The authors attributed the decline in photosynthetic rate under sodium chloride stress to reduced Rubisco activity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NaCl stresse0
- Gene
- Rubiscoe0
- Outcome
- decline of Pne0
- Direction
- declinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline of Pn in seedlings was due to the decreased Rubisco activity under NaCl stress”
t0“cucumber”
Claim · model-written summary
Rootstock grafted seedlings had higher pigment content, photosynthetic rate and stomatal conductance than self grafted seedlings under either salt stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- rootstock-grafted seedlingse0
- Outcome
- photosynthetic pigment content,Pn,Gse0
- Direction
- highere0
- Qualifier
- under iso-osmotic Ca(NO3)2 or NaCl stresse0
- Comparator
- self-grafted seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic pigment content,Pn,Gs,Ci,WUE,ΦPSⅡ,qP,Rubisco activity and content in rootstock-grafted seedlings were more higher than those of self-grafted seedlings under iso-osmotic Ca(NO3)2 or NaCl stress”
t0“cucumber”
Claim · model-written summary
Rootstock grafted seedlings had higher Ci, WUE and PSII efficiency than self grafted seedlings under either salt stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- rootstock-grafted seedlingse0
- Outcome
- Ci,WUE,ΦPSⅡe0
- Direction
- highere0
- Comparator
- self-grafted seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic pigment content,Pn,Gs,Ci,WUE,ΦPSⅡ,qP,Rubisco activity and content in rootstock-grafted seedlings were more higher than those of self-grafted seedlings under iso-osmotic Ca(NO3)2 or NaCl stress”
t0“cucumber”
Claim · model-written summary
Rootstock grafted seedlings had higher photochemical quenching and Rubisco activity and content than self grafted seedlings.
- Taxon
- cucumberCucumis sativust0
- Treatment
- rootstock-grafted seedlingse0
- Outcome
- qP,Rubisco activity and contente0
- Direction
- highere0
- Comparator
- self-grafted seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“qP,Rubisco activity and content in rootstock-grafted seedlings were more higher than those of self-grafted seedlings under iso-osmotic Ca(NO3)2 or NaCl stress”
t0“cucumber”
Claim · model-written summary
Rootstock grafting upregulated RbcL, RCA and PRK under salt stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- rootstock-graftede0
- Outcome
- RbcL(Rubisco large subunit),RCA(Rubisco activase)and PRK(5-phosphoribulokinase)e0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genes of RbcL(Rubisco large subunit),RCA(Rubisco activase)and PRK(5-phosphoribulokinase)were also up-regulated while RbcS(Rubisco small subunit)was down regulated by rootstock-grafted under salt stress”
t0“cucumber”
Claim · model-written summary
Rootstock grafting downregulated RbcS under salt stress.
- Taxon
- cucumberCucumis sativust0
- Treatment
- rootstock-graftede0
- Outcome
- RbcS(Rubisco small subunit)e0
- Direction
- down regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RbcS(Rubisco small subunit)was down regulated by rootstock-grafted under salt stress”
t0“cucumber”
Claim · model-written summary
The authors concluded that pumpkin grafting maintains greater PSII activity and carbon assimilation.
- Taxon
- cucumberCucumis sativust0
- Treatment
- grafting with salt-tolerant pumpkine0
- Outcome
- activity of PSⅡand carbon assimilation capacitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grafting with salt-tolerant pumpkin could maintain higher activity of PSⅡand carbon assimilation capacity”
t0“cucumber”
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