Abstract
Heat stress is an environmental problem that can negatively impact tomato productivity by reducing fruit setting and disrupting pollen development. The present study aims to understand the molecular mechanism of heat tolerance induced by L-ascorbic acid. Plants were grown in the summer of 2022 (day and night temperatures were 34.4°C and 25.2 °C respectively). The plants were divided into two groups: one was sprayed with L-ascorbic acid (0.5 mM) and the other served as a control. Growth parameters, antioxidant enzymes, proline, hydrogen peroxide, and malondialdehyde levels in the leaves were determined. Additionally, a molecular docking allowed understanding the interaction between the antioxidant enzymes and L-ascorbic acid. Results indicated that L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase), proline content, fruit setting, and growth indicators (shoot and root fresh and dry weight). It also reduced hydrogen peroxide and malondialdehyde levels in tomato leaves. Furthermore, the in-silico analysis revealed that L-ascorbic acid binding energies toward antioxidant enzymes were similar to those of known activators. In conclusion, foliar application of L-ascorbic acid (0.5 mM) effectively mitigated heat stress effects, activating antioxidant enzymes and eliminating reactive oxygen species, ultimately resulting in increased fruit setting.
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Claims 8
Claim · model-written summary
L-ascorbic acid increased four antioxidant enzyme activities.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- L-ascorbic acide0
- Outcome
- antioxidant enzyme activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e0“L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase)”
Claim · model-written summary
L-ascorbic acid increased leaf proline content.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- L-ascorbic acide0
- Outcome
- proline contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e0“L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase), proline content”
Claim · model-written summary
L-ascorbic acid increased fruit setting.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- L-ascorbic acide0
- Outcome
- fruit settinge0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e0“L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase), proline content, fruit setting”
Claim · model-written summary
L-ascorbic acid increased shoot and root fresh and dry weight.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- L-ascorbic acide0
- Outcome
- shoot and root fresh and dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e0“L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase), proline content, fruit setting, and growth indicators (shoot and root fresh and dry weight)”
Claim · model-written summary
L-ascorbic acid reduced hydrogen peroxide in tomato leaves.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- leavese0
- Treatment
- L-ascorbic acide1
- Outcome
- hydrogen peroxidee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e0“It also reduced hydrogen peroxide and malondialdehyde levels in tomato leaves”
e1“L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase)”
Claim · model-written summary
L-ascorbic acid reduced malondialdehyde in tomato leaves.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- leavese0
- Treatment
- L-ascorbic acide1
- Outcome
- malondialdehyde levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Plants”
e0“It also reduced hydrogen peroxide and malondialdehyde levels in tomato leaves”
e1“L-ascorbic acid increased antioxidant enzyme activities (catalase, peroxidase, ascorbate peroxidase, polyphenol oxidase)”
Claim · model-written summary
Docking found L-ascorbic acid binding energies toward antioxidant enzymes similar to known activators.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- L-ascorbic acid binding energies toward antioxidant enzymese0
- Comparator
- known activatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L-ascorbic acid binding energies toward antioxidant enzymes were similar to those of known activators”
t0“Tomato Plants”
Claim · model-written summary
The authors conclude foliar L-ascorbic acid mitigated heat stress by activating antioxidant enzymes and eliminating reactive oxygen species, increasing fruit setting.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- foliar application of L-ascorbic acid (0.5 mM)e0
- Outcome
- increased fruit settinge0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of L-ascorbic acid (0.5 mM) effectively mitigated heat stress effects, activating antioxidant enzymes and eliminating reactive oxygen species, ultimately resulting in increased fruit setting”
t0“Tomato Plants”
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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.