Abstract
High light (HL) significantly impacts plant photosynthesis. This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1), aiming to understand the role of Mg in mitigating the impact of HL on photosynthesis and carbon–nitrogen metabolism. Plants treated with 1 mol Mg plant−1 under 750 μmol m−2 s−1 light conditions served as the control. HL led to a reduced chlorophyll (Chl) content and inhibited the maximum photosynthetic rate (Pmax). It also decreased energy involved in photosynthetic electron transfer (ET) and electron flux to reduction end-electron acceptors at the photosystems I (PSI) acceptor side (RE) and caused photosynthetic system damage. H2O2 accumulation exacerbated membrane lipid peroxidation damage, disrupting carbon and nitrogen metabolism, and inducing antioxidant enzyme activity. HMg2 increased Chl content, stomatal conductance, intercellular CO2 concentration, and the net photosynthetic rate compared to HMg0. It enhanced ET efficiency, PSI and PSII functionality, reduced dissipated energy flux (DI), and minimized photosynthesis damage. Conversely, excessive Mg application (HMg5) decreased Pmax and PSII activity, increasing DI. Adequate Mg supply alleviated HL’s detrimental effects by enhancing Chl content and ET and RE efficiency.
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Claims 20
Claim · model-written summary
High light reduced tobacco chlorophyll (Chl) content.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- HLe0
- Outcome
- chlorophyll (Chl) contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HL led to a reduced chlorophyll (Chl) content and inhibited the maximum photosynthetic rate (Pmax).”
t0“Tobacco Plants”
Claim · model-written summary
High light inhibited tobacco maximum photosynthetic rate (Pmax).
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HLe0
- Outcome
- maximum photosynthetic rate (Pmax)e0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HL led to a reduced chlorophyll (Chl) content and inhibited the maximum photosynthetic rate (Pmax).”
t0“Tobacco Plants”
Claim · model-written summary
High light decreased tobacco energy involved in photosynthetic electron transfer (ET).
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HLe1
- Outcome
- energy involved in photosynthetic electron transfer (ET)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It also decreased energy involved in photosynthetic electron transfer (ET) and electron flux to reduction end-electron acceptors at the photosystems I (PSI) acceptor side (RE) and caused photosynthetic system damage.”
e1“HL led to a reduced chlorophyll (Chl) content and inhibited the maximum photosynthetic rate (Pmax).”
Claim · model-written summary
High light decreased tobacco electron flux to reduction end-electron acceptors at the photosystems I (PSI) acceptor side (RE).
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HLe1
- Outcome
- electron flux to reduction end-electron acceptors at the photosystems I (PSI) acceptor side (RE)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It also decreased energy involved in photosynthetic electron transfer (ET) and electron flux to reduction end-electron acceptors at the photosystems I (PSI) acceptor side (RE) and caused photosynthetic system damage.”
e1“HL led to a reduced chlorophyll (Chl) content and inhibited the maximum photosynthetic rate (Pmax).”
Claim · model-written summary
High light caused tobacco photosynthetic system damage.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HLe1
- Outcome
- photosynthetic system damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It also decreased energy involved in photosynthetic electron transfer (ET) and electron flux to reduction end-electron acceptors at the photosystems I (PSI) acceptor side (RE) and caused photosynthetic system damage.”
e1“HL led to a reduced chlorophyll (Chl) content and inhibited the maximum photosynthetic rate (Pmax).”
Claim · model-written summary
H2O2 accumulation exacerbated tobacco membrane lipid peroxidation damage.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- H2O2e0
- Outcome
- membrane lipid peroxidation damagee0
- Direction
- exacerbatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“H2O2 accumulation exacerbated membrane lipid peroxidation damage, disrupting carbon and nitrogen metabolism, and inducing antioxidant enzyme activity.”
Claim · model-written summary
H2O2 accumulation disrupting tobacco carbon and nitrogen metabolism.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- H2O2e0
- Outcome
- carbon and nitrogen metabolisme0
- Direction
- disruptinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“H2O2 accumulation exacerbated membrane lipid peroxidation damage, disrupting carbon and nitrogen metabolism, and inducing antioxidant enzyme activity.”
Claim · model-written summary
H2O2 accumulation inducing tobacco antioxidant enzyme activity.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- H2O2e0
- Outcome
- antioxidant enzyme activitye0
- Direction
- inducinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“H2O2 accumulation exacerbated membrane lipid peroxidation damage, disrupting carbon and nitrogen metabolism, and inducing antioxidant enzyme activity.”
Claim · model-written summary
HMg2 increased tobacco Chl content compared with HMg0.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e0
- Outcome
- Chl contente0
- Direction
- increasede0
- Comparator
- HMg0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“HMg2 increased Chl content, stomatal conductance, intercellular CO2 concentration, and the net photosynthetic rate compared to HMg0.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 increased tobacco stomatal conductance compared with HMg0.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e0
- Outcome
- stomatal conductancee0
- Direction
- increasede0
- Comparator
- HMg0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“HMg2 increased Chl content, stomatal conductance, intercellular CO2 concentration, and the net photosynthetic rate compared to HMg0.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 increased tobacco intercellular CO2 concentration compared with HMg0.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e0
- Outcome
- intercellular CO2 concentratione0
- Direction
- increasede0
- Comparator
- HMg0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“HMg2 increased Chl content, stomatal conductance, intercellular CO2 concentration, and the net photosynthetic rate compared to HMg0.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 increased tobacco net photosynthetic rate compared with HMg0.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e0
- Outcome
- net photosynthetic ratee0
- Direction
- increasede0
- Comparator
- HMg0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“HMg2 increased Chl content, stomatal conductance, intercellular CO2 concentration, and the net photosynthetic rate compared to HMg0.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 enhanced tobacco ET efficiency.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e1
- Outcome
- ET efficiencye0
- Direction
- enhancede0
- Comparator
- HMg0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It enhanced ET efficiency, PSI and PSII functionality, reduced dissipated energy flux (DI), and minimized photosynthesis damage.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 enhanced tobacco PSI and PSII functionality.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e1
- Outcome
- PSI and PSII functionalitye0
- Direction
- enhancede0
- Comparator
- HMg0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It enhanced ET efficiency, PSI and PSII functionality, reduced dissipated energy flux (DI), and minimized photosynthesis damage.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 reduced tobacco dissipated energy flux (DI).
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e1
- Outcome
- dissipated energy flux (DI)e0
- Direction
- reducede0
- Comparator
- HMg0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It enhanced ET efficiency, PSI and PSII functionality, reduced dissipated energy flux (DI), and minimized photosynthesis damage.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
HMg2 minimized tobacco photosynthesis damage.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- HMg2e1
- Outcome
- photosynthesis damagee0
- Direction
- minimizede0
- Comparator
- HMg0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“It enhanced ET efficiency, PSI and PSII functionality, reduced dissipated energy flux (DI), and minimized photosynthesis damage.”
e1“This study investigated the effects of different magnesium (Mg) levels (0, 1, 2, and 5 mol Mg plant−1; HMg0, HMg1, HMg2, and HMg5) on tobacco (Nicotiana tabacum L. cv. Cuibi No. 1) under HL (1500 μmol m−2 s−1)”
Claim · model-written summary
Excessive Mg application decreased tobacco Pmax.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- excessive Mg application (HMg5)e0
- Outcome
- Pmaxe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“Conversely, excessive Mg application (HMg5) decreased Pmax and PSII activity, increasing DI.”
Claim · model-written summary
Excessive Mg application decreased tobacco PSII activity.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- excessive Mg application (HMg5)e0
- Outcome
- PSII activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“Conversely, excessive Mg application (HMg5) decreased Pmax and PSII activity, increasing DI.”
Claim · model-written summary
Excessive Mg application increasing tobacco DI.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- excessive Mg application (HMg5)e0
- Outcome
- DIe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“Conversely, excessive Mg application (HMg5) decreased Pmax and PSII activity, increasing DI.”
Claim · model-written summary
Adequate Mg supply alleviated the effects of high light on tobacco photosynthesis.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Adequate Mg supplye0
- Outcome
- HL’s detrimental effectse0
- Direction
- alleviatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Plants”
e0“Adequate Mg supply alleviated HL’s detrimental effects by enhancing Chl content and ET and RE efficiency.”
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