Abstract
Silicon can improve drought tolerance of plants, but the mechanism still remains unclear. Previous studies have mainly concentrated on silicon-accumulating plants, whereas less work has been conducted in silicon-excluding plants, such as tomato (Solanum lycopersicum L.). In this study, we investigated the effects of exogenous silicon (2.5 mmol L−1) on the chlorophyll fluorescence and expression of photosynthesis-related genes in tomato seedlings (Zhongza 9) under water stress induced by 10% (w/v) polyethylene glycol (PEG-6000). The results showed that under water stress, the growth of shoot and root was inhibited, and the chlorophyll and carotenoid concentrations were decreased, while silicon addition improved the plant growth and increased the concentrations of chlorophyll and carotenoid. Under water sterss, chlorophyll fluorescence parameters such as PSII maximum photochemical efficiency (Fv/Fm), effective quantum efficiency, actual photochemical quantum efficiency (ϕPSII), photosynthetic electron transport rate (ETR), and photochemical quenching coefficient (qP) were decreased; while these changes were reversed in the presence of added silicon. The expressions of some photosynthesis-related genes including PetE, PetF, PsbP, PsbQ, PsbW, and Psb28 were down-regulated under water stress, and exogenous Si could partially up-regulate their expressions. These results suggest that silicon plays a role in the alleviation of water stress by modulating some photosynthesis-related genes and regulating the photochemical process, and thus promoting photosynthesis.
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Claims 8
Claim · model-written summary
Water stress inhibited tomato shoot and root growth.
- Taxon
- tomato seedlings
Solanum lycopersicumt0 - Treatment
- water stresse0
- Outcome
- growth of shoot and roote0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under water stress, the growth of shoot and root was inhibited”
t0“tomato seedlings”
Claim · model-written summary
Water stress decreased chlorophyll and carotenoid concentrations in tomato seedlings.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- water stresse0
- Outcome
- chlorophyll and carotenoid concentrationse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under water stress, the growth of shoot and root was inhibited, and the chlorophyll and carotenoid concentrations were decreased”
t0“tomato seedlings”
Claim · model-written summary
Silicon improved growth of water-stressed tomato seedlings.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- silicon additione0
- Outcome
- plant growthe0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while silicon addition improved the plant growth”
t0“tomato seedlings”
Claim · model-written summary
Silicon increased chlorophyll and carotenoid concentrations under water stress.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- silicon additione0
- Outcome
- concentrations of chlorophyll and carotenoide0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“silicon addition improved the plant growth and increased the concentrations of chlorophyll and carotenoid”
t0“tomato seedlings”
Claim · model-written summary
Water stress decreased tomato chlorophyll fluorescence parameters.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- water stersse0
- Outcome
- chlorophyll fluorescence parameterse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under water sterss, chlorophyll fluorescence parameters such as PSII maximum photochemical efficiency (Fv/Fm), effective quantum efficiency, actual photochemical quantum efficiency (ϕPSII), photosynthetic electron transport rate (ETR), and photochemical quenching coefficient (qP) were decreased”
t0“tomato seedlings”
Claim · model-written summary
Added silicon reversed the water-stress decreases in tomato chlorophyll fluorescence parameters.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- added silicone0
- Outcome
- these changese0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these changes were reversed in the presence of added silicon”
t0“tomato seedlings”
Claim · model-written summary
Water stress down-regulated six photosynthesis-related genes in tomato.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- water stresse0
- Gene
- PetE, PetF, PsbP, PsbQ, PsbW, and Psb28e0
- Outcome
- expressions of some photosynthesis-related genese0
- Direction
- down-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expressions of some photosynthesis-related genes including PetE, PetF, PsbP, PsbQ, PsbW, and Psb28 were down-regulated under water stress”
t0“tomato seedlings”
Claim · model-written summary
Exogenous silicon partially up-regulated these photosynthesis-related genes.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- exogenous Sie0
- Outcome
- their expressionse0
- Direction
- up-regulatee0
- Qualifier
- partiallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous Si could partially up-regulate their expressions”
t0“tomato seedlings”
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