Abstract
To reveal and quantify the interactive effects of drought stresses and elevated CO2 concentration [CO2] on photochemistry efficiency of cucumber seedlings, the portable chlorophyll meter was used to measure the chlorophyll content, and the Imaging-PAM was used to image the chlorophyll fluorescence parameters and rapid light response curves (RLC) of leaves in two adjacent greenhouses. The results showed that chlorophyll content of leaves was reduced significantly with drought stress aggravated. Minimal fluorescence (Fo) was increased while maximal quantum yield of PSII (Fv/Fm) decreased significantly by severe drought stress. The significant decrease of effective quantum yield of PSII (Y(II)) accompanied by the significant increase of quantum yield of regulated energy dissipation (Y(NPQ)) was observed under severe drought stress condition, but there was no change of quantum yield of nonregulated energy dissipation (Y(NO)). We detected that the coefficient of photochemical quenching (qP) decreased, and non-photochemical quenching (NPQ) increased significantly under severe drought stress. Furthermore, we found that maximum apparent electron transport rate (ETR(max)) and saturating photosynthetically active radiation (PPFD(sat)) decreased significantly with drought stress aggravated. However, elevated [CO2] significantly increased Fv/Fm, qP and PPFD(sat), and decreased NPQ under all water conditions, although there were no significant effects on chlorophyll content, Fo, Y(II), Y(NPQ), Y(NO) and ETR(max). Therefore, it is concluded that CO2-fertilized greenhouses or elevated atmospheric [CO2] in the future could be favorable for cucumber growth and development, and beneficial to alleviate the negative effects of drought stresses to a certain extent.
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Claims 14
Claim · model-written summary
Chlorophyll content of leaves decreased significantly as drought stress aggravated
- Taxon
- Cucumber Seedlings
Cucumis sativust0 - Organ / stage
- leavese1
- Treatment
- drought stress aggravatede1
- Outcome
- chlorophyll contente1
- Direction
- reducede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e1“chlorophyll content of leaves was reduced significantly with drought stress aggravated”
Claim · model-written summary
Minimal fluorescence (Fo) increased under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stresse2
- Outcome
- Minimal fluorescence (Fo)e2
- Direction
- increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e2“Minimal fluorescence (Fo) was increased while maximal quantum yield of PSII (Fv/Fm) decreased significantly by severe drought stress”
Claim · model-written summary
Maximal quantum yield of PSII (Fv/Fm) decreased significantly under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stresse2
- Outcome
- maximal quantum yield of PSII (Fv/Fm)e2
- Direction
- decreasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e2“Minimal fluorescence (Fo) was increased while maximal quantum yield of PSII (Fv/Fm) decreased significantly by severe drought stress”
Claim · model-written summary
Effective quantum yield of PSII (Y(II)) decreased significantly under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stress conditione3
- Outcome
- effective quantum yield of PSII (Y(II))e3
- Direction
- decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e3“The significant decrease of effective quantum yield of PSII (Y(II)) accompanied by the significant increase of quantum yield of regulated energy dissipation (Y(NPQ)) was observed under severe drought stress condition”
Claim · model-written summary
Quantum yield of regulated energy dissipation (Y(NPQ)) increased significantly under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stress conditione3
- Outcome
- quantum yield of regulated energy dissipation (Y(NPQ))e3
- Direction
- increasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e3“The significant decrease of effective quantum yield of PSII (Y(II)) accompanied by the significant increase of quantum yield of regulated energy dissipation (Y(NPQ)) was observed under severe drought stress condition”
Claim · model-written summary
Quantum yield of nonregulated energy dissipation (Y(NO)) did not change under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stress conditione3
- Outcome
- quantum yield of nonregulated energy dissipation (Y(NO))e4
- Direction
- no changee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e4“but there was no change of quantum yield of nonregulated energy dissipation (Y(NO))”
e3“under severe drought stress condition”
Claim · model-written summary
Coefficient of photochemical quenching (qP) decreased under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stresse5
- Outcome
- coefficient of photochemical quenching (qP)e5
- Direction
- decreasede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e5“We detected that the coefficient of photochemical quenching (qP) decreased, and non-photochemical quenching (NPQ) increased significantly under severe drought stress”
Claim · model-written summary
Non-photochemical quenching (NPQ) increased significantly under severe drought stress
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- severe drought stresse5
- Outcome
- non-photochemical quenching (NPQ)e5
- Direction
- increasede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e5“We detected that the coefficient of photochemical quenching (qP) decreased, and non-photochemical quenching (NPQ) increased significantly under severe drought stress”
Claim · model-written summary
Maximum apparent electron transport rate (ETR(max)) and saturating PAR (PPFD(sat)) decreased significantly with drought stress aggravated
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- drought stress aggravatede6
- Outcome
- maximum apparent electron transport rate (ETR(max)) and saturating photosynthetically active radiation (PPFD(sat))e6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e6“maximum apparent electron transport rate (ETR(max)) and saturating photosynthetically active radiation (PPFD(sat)) decreased significantly with drought stress aggravated”
Claim · model-written summary
Elevated [CO2] significantly increased Fv/Fm, qP and PPFD(sat) under all water conditions
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- elevated [CO2]e7
- Outcome
- Fv/Fm, qP and PPFD(sat)e7
- Direction
- increasede7
- Qualifier
- under all water conditionse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e7“elevated [CO2] significantly increased Fv/Fm, qP and PPFD(sat), and decreased NPQ under all water conditions”
Claim · model-written summary
Elevated [CO2] significantly decreased NPQ under all water conditions
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- elevated [CO2]e7
- Outcome
- NPQe7
- Direction
- decreasede7
- Qualifier
- under all water conditionse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e7“elevated [CO2] significantly increased Fv/Fm, qP and PPFD(sat), and decreased NPQ under all water conditions”
Claim · model-written summary
Elevated [CO2] had no significant effect on chlorophyll content, Fo and Y(II)
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- elevated [CO2]e7
- Outcome
- chlorophyll content, Fo, Y(II)e1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e7“elevated [CO2] significantly increased Fv/Fm, qP and PPFD(sat), and decreased NPQ under all water conditions”
e1“there were no significant effects on chlorophyll content, Fo, Y(II), Y(NPQ), Y(NO) and ETR(max)”
Claim · model-written summary
Elevated [CO2] had no significant effect on Y(NPQ), Y(NO) and ETR(max)
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- elevated [CO2]e7
- Outcome
- Y(NPQ), Y(NO) and ETR(max)e1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e7“elevated [CO2] significantly increased Fv/Fm, qP and PPFD(sat), and decreased NPQ under all water conditions”
e1“there were no significant effects on chlorophyll content, Fo, Y(II), Y(NPQ), Y(NO) and ETR(max)”
Claim · model-written summary
Elevated or CO2-fertilized greenhouse conditions could be favorable for cucumber growth and development and alleviate drought effects to a certain extent
- Taxon
- Cucumber SeedlingsCucumis sativust0
- Treatment
- CO2-fertilized greenhouses or elevated atmospheric [CO2]e1
- Outcome
- cucumber growth and developmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber Seedlings”
e1“CO2-fertilized greenhouses or elevated atmospheric [CO2] in the future could be favorable for cucumber growth and development, and beneficial to alleviate the negative effects of drought stresses to a certain extent”
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