Abstract
Two greenhouse experiments were conducted in order to investigate the effects of different levels of water stress on gas exchange, chlorophyll fluorescence, chlorophyll content, antioxidant enzyme activities, lipid peroxidation, and yield of tomato plants (Solanum lycopersicum cv. Jinfen 2). Four levels of soil water content were used: control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%). The controlled irrigation was initiated from the third leaf stage until maturity. The results of two-year trials indicated that the stomatal conductance, net photosynthetic rate, light-saturated photosynthetic rate, and saturation radiation decreased generally under all levels of water stress during all developmental stages, while compensation radiation and dark respiration rate increased generally. Water stress also declined maximum quantum yield of PSII photochemistry, electron transfer rate, and effective quantum yield of PSII photochemistry, while nonphotochemical quenching increased in all developmental stages. All levels of water stress also caused a marked reduction of chlorophyll a, chlorophyll b, and total chlorophyll content in all developmental stages, while activities of antioxidant enzymes, such as superoxide dismutase, peroxidase, and catalase, and lipid peroxidation increased.
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Claims 8
Claim · model-written summary
Water stress decreased tomato stomatal conductance, net photosynthetic rate, light-saturated photosynthetic rate.
- Taxon
- tomato
Solanum lycopersicume1 - Material
- Jinfen 2e1
- Treatment
- water stresse0
- Outcome
- stomatal conductance, net photosynthetic rate, light-saturated photosynthetic ratee0
- Direction
- decreasede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stomatal conductance, net photosynthetic rate, light-saturated photosynthetic rate, and saturation radiation decreased generally under all levels of water stress during all developmental stages”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress decreased tomato saturation radiation.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse0
- Outcome
- saturation radiatione0
- Direction
- decreasede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stomatal conductance, net photosynthetic rate, light-saturated photosynthetic rate, and saturation radiation decreased generally under all levels of water stress during all developmental stages”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress increased tomato compensation radiation and dark respiration rate.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse2
- Outcome
- compensation radiation and dark respiration ratee0
- Direction
- increasede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while compensation radiation and dark respiration rate increased generally”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress declined tomato maximum quantum yield of PSII photochemistry, electron transfer rate, and effective quantum yield of PSII photochemistry.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse2
- Outcome
- maximum quantum yield of PSII photochemistry, electron transfer rate, and effective quantum yield of PSII photochemistrye0
- Direction
- declinede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress also declined maximum quantum yield of PSII photochemistry, electron transfer rate, and effective quantum yield of PSII photochemistry”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress increased tomato nonphotochemical quenching.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse2
- Outcome
- nonphotochemical quenchinge0
- Direction
- increasede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while nonphotochemical quenching increased in all developmental stages”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress reduction tomato chlorophyll a, chlorophyll b, and total chlorophyll content.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse0
- Outcome
- chlorophyll a, chlorophyll b, and total chlorophyll contente0
- Direction
- reductione0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All levels of water stress also caused a marked reduction of chlorophyll a, chlorophyll b, and total chlorophyll content in all developmental stages”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress increased tomato superoxide dismutase, peroxidase, and catalase.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse2
- Outcome
- superoxide dismutase, peroxidase, and catalasee0
- Direction
- increasede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while activities of antioxidant enzymes, such as superoxide dismutase, peroxidase, and catalase, and lipid peroxidation increased”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
Claim · model-written summary
Water stress increased tomato lipid peroxidation.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Jinfen 2e1
- Treatment
- water stresse2
- Outcome
- lipid peroxidatione0
- Direction
- increasede0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while activities of antioxidant enzymes, such as superoxide dismutase, peroxidase, and catalase, and lipid peroxidation increased”
e1“tomato plants (Solanum lycopersicum cv. Jinfen 2)”
e2“control (75 to 80% of field water capacity), mild water stress (55 to 60%), moderate water stress (45 to 50%), and severe water stress (35 to 40%)”
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