Abstract
Abiotic stresses such as drought, heat or salinity are major causes of yield loss worldwide. Recent studies have revealed that the acclimation of plants to a combination of different environmental stresses is unique and therefore cannot be directly deduced from studying the response of plants to each of the different stresses applied individually. The efficient detoxification of reactive oxygen species (ROS) is thought to play a key role in enhancing the tolerance of plants to abiotic stresses. Here, we report on the role of melatonin in the protection of the photosynthetic apparatus through the increase in ROS detoxification in tomato plants grown under the combination of salinity and heat, two of the most common abiotic stresses known to act jointly. Plants treated with exogenous melatonin showed a different modulation in the expression on some antioxidant-related genes and their related enzymes. More specifically, ascorbate peroxidase, glutathione reductase, glutathione peroxidase and phospholipid hydroperoxide glutathione peroxidase (APX, GR, GPX and Ph-GPX, resepctively) showed an antagonistic regulation as compared to plants that did not receive melatonin. This translated into a better antioxidant capacity and to a lesser ROS accumulation under stress combination. The performance of the photosynthesis parameters and the photosystems was also increased in plants treated with exogenous melatonin under the combination of salinity and heat. In accordance with these findings, tomato plants treated with melatonin were found to grow better under stress combination that the non-treated ones. Our study highlights the important role that exogenous melatonin plays in the acclimation of plants to a combination of two different abiotic stresses, and how this compound can specifically regulate oxidative stress-related genes and enzymes to increase plant tolerance.
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Claims 6
Claim · model-written summary
Melatonin altered expression of antioxidant-related genes and enzymes.
- Taxon
- tomato plants
Solanum lycopersicumt0 - Treatment
- exogenous melatonine0
- Outcome
- expression on some antioxidant-related genes and their related enzymese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants treated with exogenous melatonin showed a different modulation in the expression on some antioxidant-related genes and their related enzymes.”
t0“tomato plants”
Claim · model-written summary
APX, GR, GPX and Ph-GPX showed antagonistic regulation with melatonin compared with untreated plants.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- melatonine2
- Gene
- APX, GR, GPX and Ph-GPXe0
- Outcome
- antagonistic regulatione0
- Comparator
- plants that did not receive melatonine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ascorbate peroxidase, glutathione reductase, glutathione peroxidase and phospholipid hydroperoxide glutathione peroxidase (APX, GR, GPX and Ph-GPX, resepctively) showed an antagonistic regulation as compared to plants that did not receive melatonin.”
t0“tomato plants”
e2“did not receive melatonin”
Claim · model-written summary
Melatonin improved antioxidant capacity under combined stress.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- melatonine2
- Outcome
- antioxidant capacitye0
- Direction
- bettere0
- Qualifier
- under stress combinatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This translated into a better antioxidant capacity and to a lesser ROS accumulation under stress combination.”
t0“tomato plants”
e2“Plants treated with exogenous melatonin”
Claim · model-written summary
Melatonin reduced ROS accumulation under combined stress.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- melatonine2
- Outcome
- ROS accumulatione0
- Direction
- lessere0
- Qualifier
- under stress combinatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This translated into a better antioxidant capacity and to a lesser ROS accumulation under stress combination.”
t0“tomato plants”
e2“Plants treated with exogenous melatonin”
Claim · model-written summary
Melatonin increased photosynthesis parameter and photosystem performance under combined salinity and heat.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- exogenous melatonine0
- Outcome
- performance of the photosynthesis parameters and the photosystemse0
- Direction
- increasede0
- Qualifier
- under the combination of salinity and heate0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The performance of the photosynthesis parameters and the photosystems was also increased in plants treated with exogenous melatonin under the combination of salinity and heat.”
t0“tomato plants”
Claim · model-written summary
Melatonin-treated tomato plants grew better than untreated plants under combined stress.
- Taxon
- tomato plantsSolanum lycopersicume0
- Treatment
- melatonine0
- Outcome
- growe0
- Direction
- bettere0
- Qualifier
- under stress combinatione0
- Comparator
- the non-treated onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants treated with melatonin were found to grow better under stress combination that the non-treated ones.”
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