Abstract
Tobacco (Nicotiana tabacum L.) is an economically important crop in China. The risk of cadmium (Cd) pollution is increasing, making the mitigation of Cd stress critical for the safe production of tobacco. Silicon (Si) has been demonstrated to enhance plant growth under heavy metal stress. To elucidate the physiological and biochemical mechanisms by which Si alleviates Cd stress in tobacco, this study conducted a hydroponic experiment with three replicates using tobacco variety Yunyan 87 and employed one-way analysis of variance (ANOVA) for statistical analysis. The effects of Si on tobacco growth and the antioxidant defense system under Cd stress were investigated. The results showed that Cd stress significantly inhibited tobacco growth, increased Cd accumulation, and induced oxidative damage. Si treatment alleviated Cd stress in tobacco, increased biomass, reduced Cd concentration in different plant organs, and decreased the Cd translocation factor and bioconcentration factor. Meanwhile, the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) in tobacco roots and leaves were significantly enhanced, while the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) were also elevated. The accumulation of ascorbic acid (AsA) and glutathione (GSH) increased, and malondialdehyde (MDA) concentration decreased. Overall, these results demonstrate that Si mitigates Cd stress in tobacco by limiting Cd accumulation and transport and by coordinately activating both enzymatic and non-enzymatic antioxidant systems.
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Claims 11
Claim · model-written summary
Cd stress significantly inhibited tobacco growth.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- Cd stresse0
- Outcome
- tobacco growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd stress significantly inhibited tobacco growth, increased Cd accumulation, and induced oxidative damage”
Claim · model-written summary
Cd stress increased Cd accumulation in tobacco.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Cd stresse0
- Outcome
- Cd accumulatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd stress significantly inhibited tobacco growth, increased Cd accumulation, and induced oxidative damage”
Claim · model-written summary
Cd stress induced oxidative damage in tobacco.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Cd stresse0
- Outcome
- oxidative damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd stress significantly inhibited tobacco growth, increased Cd accumulation, and induced oxidative damage”
Claim · model-written summary
Si treatment increased tobacco biomass under Cd stress.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- Si treatmente1
- Outcome
- biomasse1
- Direction
- increasede1
Not reportedComparatorQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Si treatment alleviated Cd stress in tobacco, increased biomass, reduced Cd concentration in different plant organs, and decreased the Cd translocation factor and bioconcentration factor”
Claim · model-written summary
Si treatment reduced Cd concentration in different tobacco organs.
- Taxon
- tobaccoNicotiana tabacume1
- Organ / stage
- different plant organse1
- Treatment
- Si treatmente1
- Outcome
- Cd concentratione1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Si treatment alleviated Cd stress in tobacco, increased biomass, reduced Cd concentration in different plant organs, and decreased the Cd translocation factor and bioconcentration factor”
Claim · model-written summary
Si treatment decreased the Cd translocation factor and bioconcentration factor in tobacco.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- Si treatmente1
- Outcome
- Cd translocation factor and bioconcentration factore1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Si treatment alleviated Cd stress in tobacco, increased biomass, reduced Cd concentration in different plant organs, and decreased the Cd translocation factor and bioconcentration factor”
Claim · model-written summary
Si treatment significantly enhanced the activities of SOD, POD and CAT in tobacco roots and leaves.
- Taxon
- tobaccoNicotiana tabacume2
- Organ / stage
- roots and leavese2
- Treatment
- Si treatmente3
- Outcome
- activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)e2
- Direction
- enhancede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) in tobacco roots and leaves were significantly enhanced”
e3“Si treatment alleviated Cd stress in tobacco”
Claim · model-written summary
Si treatment elevated the activities of APX and GR in tobacco.
- Taxon
- tobaccoNicotiana tabacume3
- Treatment
- Si treatmente3
- Outcome
- activities of ascorbate peroxidase (APX) and glutathione reductase (GR)e4
- Direction
- elevatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“while the activities of ascorbate peroxidase (APX) and glutathione reductase (GR) were also elevated”
e3“Si treatment alleviated Cd stress in tobacco”
Claim · model-written summary
Si treatment increased the accumulation of AsA and GSH in tobacco.
- Taxon
- tobaccoNicotiana tabacume3
- Treatment
- Si treatmente3
- Outcome
- accumulation of ascorbic acid (AsA) and glutathione (GSH)e5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The accumulation of ascorbic acid (AsA) and glutathione (GSH) increased, and malondialdehyde (MDA) concentration decreased”
e3“Si treatment alleviated Cd stress in tobacco”
Claim · model-written summary
Si treatment decreased MDA concentration in tobacco.
- Taxon
- tobaccoNicotiana tabacume3
- Treatment
- Si treatmente3
- Outcome
- malondialdehyde (MDA) concentratione5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The accumulation of ascorbic acid (AsA) and glutathione (GSH) increased, and malondialdehyde (MDA) concentration decreased”
e3“Si treatment alleviated Cd stress in tobacco”
Claim · model-written summary
The authors conclude that Si mitigates Cd stress in tobacco by limiting Cd accumulation and transport and by coordinately activating enzymatic and non-enzymatic antioxidant systems.
- Taxon
- tobaccoNicotiana tabacume6
- Treatment
- Sie6
- Outcome
- Cd stresse6
- Qualifier
- limiting Cd accumulation and transport and by coordinately activating both enzymatic and non-enzymatic antioxidant systemse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Si mitigates Cd stress in tobacco by limiting Cd accumulation and transport and by coordinately activating both enzymatic and non-enzymatic antioxidant systems”
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7 papers in the same direction as this paper
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2 papers in the same direction as this paper · 1 in the opposite direction
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8 of 10 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.