Abstract
A hydroponic experiment was conducted to study the effects of exogenous sodium nitroprusside (SNP), a NO donor, on the active oxygen metabolism and photosynthetic characteristics of tomato (Lycopersicon esculentum Mill.) seedlings under Cd stress. The results showed that under the stress, applying 100 micromol x L(-1) SNP promoted the activities of plant superoxide dismutase (SOD) and catalase (CAT) significantly, increased the leaf- and root calcium (Ca) and iron (Fe) contents and the leaf chlorophyll content, net photosynthetic rate (P(n)), transpiration rate (T(r)), and stomatal conductance (G(s)), and decreased the contents of H2O2 and MDA and the concentration of intercellular CO2 (C(i)). The addition of hemoglobin, a NO scavenger, eliminated the effects of SNP, while applying 100 micromol x L(-1) sodium nitrate or nitrite (the decomposition products of NO or its donor SNP) or 100 micromol x L(-1) sodium ferrocyanide (an analog of SNP) had no significant alleviation effects on Cd stress. This study suggested that exogenous NO could promote the scavenging of reactive oxygen, keep the mineral nutrition in balance, and alleviate the damage of Cd stress to the leaf photosynthetic apparatus, making the tomato seedlings preserve their photosynthetic efficiency.
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Claims 9
Claim · model-written summary
Under cadmium stress, 100 micromol x L(-1) SNP significantly promoted SOD and CAT activities.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- 100 micromol x L(-1) SNPe0
- Gene
- superoxide dismutase (SOD) and catalase (CAT)e0
- Outcome
- activities of plant superoxide dismutase (SOD) and catalase (CAT)e0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the stress, applying 100 micromol x L(-1) SNP promoted the activities of plant superoxide dismutase (SOD) and catalase (CAT) significantly”
t0“tomato seedlings”
Claim · model-written summary
Under cadmium stress, SNP increased leaf and root calcium and iron contents.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 100 micromol x L(-1) SNPe0
- Outcome
- leaf- and root calcium (Ca) and iron (Fe) contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying 100 micromol x L(-1) SNP promoted the activities of plant superoxide dismutase (SOD) and catalase (CAT) significantly, increased the leaf- and root calcium (Ca) and iron (Fe) contents”
t0“tomato seedlings”
Claim · model-written summary
Under cadmium stress, SNP increased leaf chlorophyll content, net photosynthetic rate, transpiration rate and stomatal conductance.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 100 micromol x L(-1) SNPe1
- Outcome
- leaf chlorophyll content, net photosynthetic rate (P(n)), transpiration rate (T(r)), and stomatal conductance (G(s))e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the leaf- and root calcium (Ca) and iron (Fe) contents and the leaf chlorophyll content, net photosynthetic rate (P(n)), transpiration rate (T(r)), and stomatal conductance (G(s))”
e1“applying 100 micromol x L(-1) SNP”
t0“tomato seedlings”
Claim · model-written summary
Under cadmium stress, SNP decreased H2O2 and MDA contents and intercellular CO2 concentration.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 100 micromol x L(-1) SNPe1
- Outcome
- contents of H2O2 and MDA and the concentration of intercellular CO2 (C(i))e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased the contents of H2O2 and MDA and the concentration of intercellular CO2 (C(i))”
e1“applying 100 micromol x L(-1) SNP”
t0“tomato seedlings”
Claim · model-written summary
Hemoglobin eliminated the effects of SNP under cadmium stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- addition of hemoglobine0
- Outcome
- effects of SNPe0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of hemoglobin, a NO scavenger, eliminated the effects of SNP”
t0“tomato seedlings”
Claim · model-written summary
Sodium nitrate or nitrite had no significant alleviation effect on cadmium stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 100 micromol x L(-1) sodium nitrate or nitritee0
- Outcome
- alleviation effects on Cd stresse0
- Direction
- no significante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying 100 micromol x L(-1) sodium nitrate or nitrite (the decomposition products of NO or its donor SNP) or 100 micromol x L(-1) sodium ferrocyanide (an analog of SNP) had no significant alleviation effects on Cd stress”
t0“tomato seedlings”
Claim · model-written summary
Sodium ferrocyanide had no significant alleviation effect on cadmium stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 100 micromol x L(-1) sodium ferrocyanidee0
- Outcome
- alleviation effects on Cd stresse0
- Direction
- no significante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“100 micromol x L(-1) sodium ferrocyanide (an analog of SNP) had no significant alleviation effects on Cd stress”
t0“tomato seedlings”
Claim · model-written summary
The authors concluded that exogenous NO promoted reactive oxygen scavenging and mineral balance, alleviating photosynthetic damage from Cd stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Compound
- NOe0
- Outcome
- damage of Cd stress to the leaf photosynthetic apparatuse0
- Qualifier
- scavenging of reactive oxygene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous NO could promote the scavenging of reactive oxygen, keep the mineral nutrition in balance, and alleviate the damage of Cd stress to the leaf photosynthetic apparatus”
t0“tomato seedlings”
Claim · model-written summary
The authors concluded that exogenous NO allowed tomato seedlings to preserve photosynthetic efficiency under cadmium stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- exogenous NOe1
- Outcome
- photosynthetic efficiencye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“making the tomato seedlings preserve their photosynthetic efficiency”
e1“exogenous NO could promote the scavenging of reactive oxygen”
t0“tomato seedlings”
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See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.