Abstract
Soil salinity is one of the major factors that affect plant growth and decrease agricultural productivity worldwide. Chitosan (CTS) has been shown to promote plant growth and increase the abiotic stress tolerance of plants. However, it still remains unknown whether the application of exogenous CTS can mitigate the deleterious effects of salt stress on lettuce plants. Therefore, the current study investigated the effect of foliar application of exogenous CTS to lettuce plants grown under 100 mM NaCl saline conditions. The results showed that exogenous CTS increased the lettuce total leaf area, shoot fresh weight, and shoot and root dry weight, increased leaf chlorophyll a, proline, and soluble sugar contents, enhanced peroxidase and catalase activities, and alleviated membrane lipid peroxidation, in comparison with untreated plants, in response to salt stress. Furthermore, the application of exogenous CTS increased the accumulation of K+ in lettuce but showed no significant effect on the K+/Na+ ratio, as compared with that of plants treated with NaCl alone. These results suggested that exogenous CTS might mitigate the adverse effects of salt stress on plant growth and biomass by modulating the intracellular ion concentration, controlling osmotic adjustment, and increasing antioxidant enzymatic activity in lettuce leaves.
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Claims 7
Claim · model-written summary
Chitosan increased lettuce leaf area and shoot and root biomass under salt stress.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- exogenous CTSe0
- Outcome
- total leaf area, shoot fresh weight, and shoot and root dry weighte0
- Direction
- increasede0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous CTS increased the lettuce total leaf area, shoot fresh weight, and shoot and root dry weight, increased leaf chlorophyll a, proline, and soluble sugar contents, enhanced peroxidase and catalase activities, and alleviated membrane lipid peroxidation, in comparison with untreated plants”
Claim · model-written summary
Chitosan increased chlorophyll a, proline and soluble sugar contents.
- Taxon
- lettuceLactuca sativae0
- Treatment
- exogenous CTSe0
- Outcome
- leaf chlorophyll a, proline, and soluble sugar contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous CTS increased the lettuce total leaf area, shoot fresh weight, and shoot and root dry weight, increased leaf chlorophyll a, proline, and soluble sugar contents”
Claim · model-written summary
Chitosan enhanced peroxidase and catalase activities.
- Taxon
- lettuceLactuca sativae0
- Treatment
- exogenous CTSe0
- Outcome
- peroxidase and catalase activitiese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous CTS increased the lettuce total leaf area, shoot fresh weight, and shoot and root dry weight, increased leaf chlorophyll a, proline, and soluble sugar contents, enhanced peroxidase and catalase activities”
Claim · model-written summary
Chitosan alleviated membrane lipid peroxidation.
- Taxon
- lettuceLactuca sativae0
- Treatment
- exogenous CTSe0
- Outcome
- membrane lipid peroxidatione0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous CTS increased the lettuce total leaf area, shoot fresh weight, and shoot and root dry weight, increased leaf chlorophyll a, proline, and soluble sugar contents, enhanced peroxidase and catalase activities, and alleviated membrane lipid peroxidation”
Claim · model-written summary
Chitosan increased K+ accumulation in lettuce compared with NaCl treatment alone.
- Taxon
- lettuceLactuca sativae0
- Treatment
- application of exogenous CTSe0
- Outcome
- accumulation of K+e0
- Direction
- increasede0
- Comparator
- plants treated with NaCl alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of exogenous CTS increased the accumulation of K+ in lettuce but showed no significant effect on the K+/Na+ ratio, as compared with that of plants treated with NaCl alone”
Claim · model-written summary
Chitosan had no significant effect on the K+/Na+ ratio compared with NaCl alone.
- Taxon
- lettuceLactuca sativae0
- Treatment
- application of exogenous CTSe0
- Outcome
- K+/Na+ ratioe0
- Comparator
- plants treated with NaCl alonee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of exogenous CTS increased the accumulation of K+ in lettuce but showed no significant effect on the K+/Na+ ratio, as compared with that of plants treated with NaCl alone”
Claim · model-written summary
The authors suggested chitosan mitigates salt stress through ion balance, osmotic adjustment and antioxidant activity.
- Taxon
- lettuceLactuca sativae0
- Treatment
- exogenous CTSe0
- Outcome
- plant growth and biomasse0
- Direction
- mitigatee0
- Qualifier
- modulating the intracellular ion concentration, controlling osmotic adjustment, and increasing antioxidant enzymatic activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous CTS might mitigate the adverse effects of salt stress on plant growth and biomass by modulating the intracellular ion concentration, controlling osmotic adjustment, and increasing antioxidant enzymatic activity in lettuce leaves”
The same questions in other papers
chitosan · growth · Lactuca sativa (garden lettuce)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
4 papers more in this group
See all 8 papers →chitosan · physiology: pigments · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
chitosan · physiology: antioxidant enzymes · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
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.