Abstract
Introduction: Salt stress has emerged as a predominant abiotic factor that jeopardizes global crop growth and yield. The plant hormone salicylic acid (SA) has notable potential in mitigating salt toxicity, yet its mechanism in enhancing the salinity tolerance of tobacco plants is not well explored. Methods: This study aimed to assess the potential benefits of exogenous SA application (1.0 mM) on tobacco seedlings subjected to saline soil conditions. Results: ratios, pigment biosynthesis, and electron transport efficiency under NaCl stress. Additionally, SA increased the contents of total phenolic compound and soluble protein by 16.2% and 28.7% to alleviate NaCl-induced oxidative damage. Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings. Exogenous SA also increased ascorbate and glutathione levels and reduced their reduced forms by increasing the activities of glutathione reductase, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductase. qRT-PCR analysis revealed that the key genes regulating SA biosynthesis, carbon assimilation, the antioxidant system and the ascorbate-glutathione cycle were activated by SA under conditions of salt stress. Discussion: Our study elucidates the physiological and molecular mechanisms of exogenous SA in enhancing plant salt tolerance and provides a practical basis for crop improvement in saline environments.
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Claims 7
Claim · model-written summary
Exogenous SA increased total phenolic compound contents of salt-stressed tobacco seedlings by 16.2%.
- Taxon
- tobacco
Nicotiana tabacume2 - Treatment
- exogenous SA applicatione0
- Outcome
- contents of total phenolic compounde1
- Direction
- increasede1
- Value
- 16.2%e1
- Qualifier
- to alleviate NaCl-induced oxidative damagee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study aimed to assess the potential benefits of exogenous SA application (1.0 mM) on tobacco seedlings subjected to saline soil conditions”
e1“SA increased the contents of total phenolic compound and soluble protein by 16.2% and 28.7% to alleviate NaCl-induced oxidative damage”
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
Claim · model-written summary
Exogenous SA increased soluble protein contents of salt-stressed tobacco seedlings by 28.7%.
- Taxon
- tobaccoNicotiana tabacume2
- Treatment
- SAe1
- Outcome
- soluble proteine1
- Direction
- increasede1
- Value
- 28.7%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“SA increased the contents of total phenolic compound and soluble protein by 16.2% and 28.7% to alleviate NaCl-induced oxidative damage”
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
Claim · model-written summary
Exogenous SA increased antioxidant enzyme activities by 4.2% to 14.4% in salt-stressed tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume2
- Treatment
- SA sprayede2
- Outcome
- activities of antioxidant enzymese2
- Direction
- increasede2
- Value
- 4.2%~14.4%e2
- Qualifier
- Under salt stressed conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
Claim · model-written summary
Exogenous SA increased ascorbate and glutathione levels in tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume2
- Treatment
- Exogenous SAe3
- Outcome
- ascorbate and glutathione levelse3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
e3“Exogenous SA also increased ascorbate and glutathione levels and reduced their reduced forms by increasing the activities of glutathione reductase, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductase”
Claim · model-written summary
Exogenous SA reduced the reduced forms of ascorbate and glutathione in tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume2
- Treatment
- Exogenous SAe3
- Outcome
- their reduced formse3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
e3“Exogenous SA also increased ascorbate and glutathione levels and reduced their reduced forms by increasing the activities of glutathione reductase, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductase”
Claim · model-written summary
Exogenous SA increased the activities of glutathione reductase, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductase in tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume2
- Treatment
- Exogenous SAe3
- Outcome
- activities of glutathione reductase, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductasee3
- Direction
- increasinge3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
e3“Exogenous SA also increased ascorbate and glutathione levels and reduced their reduced forms by increasing the activities of glutathione reductase, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductase”
Claim · model-written summary
Exogenous SA activated key genes of SA biosynthesis, carbon assimilation, the antioxidant system and the ascorbate-glutathione cycle under salt stress.
- Taxon
- tobaccoNicotiana tabacume2
- Treatment
- SAe4
- Outcome
- key genes regulating SA biosynthesis, carbon assimilation, the antioxidant system and the ascorbate-glutathione cyclee4
- Direction
- activatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Under salt stressed conditions, the activities of antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, and peroxidase increased by 4.2%~14.4% in SA sprayed tobacco seedlings”
e4“qRT-PCR analysis revealed that the key genes regulating SA biosynthesis, carbon assimilation, the antioxidant system and the ascorbate-glutathione cycle were activated by SA under conditions of salt stress”
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