Abstract
Melatonin, a pleiotropic signal molecule, has been shown to play important roles in the regulation of plant growth, development, and responses to environmental stresses. Since a few species have been investigated to unveil the effect of exogenous melatonin on salt stress, the underlying mechanism of melatonin-mediated salt stress tolerance in other plant species still remains largely unknown. In this study, the effects of melatonin on leaf photosynthesis and redox homeostasis in watermelon were examined under salt stress (300 mM NaCl) along with different doses of melatonin (50, 150, and 500 μM) pretreatment. NaCl stress inhibited photosynthesis and increased accumulation of reactive oxygen species and membrane damage in leaves of watermelon seedlings. However, pretreatment with melatonin on roots alleviated NaCl-induced decrease in photosynthetic rate and oxidative stress in a dose-dependent manner. The protection of photosynthesis by melatonin was closely associated with the inhibition of stomatal closure and improved light energy absorption and electron transport in photosystem II, while the reduction of oxidative stress by melatonin was attributed to the improved redox homeostasis coupled with the enhanced activities of antioxidant enzymes. This study unraveled crucial role of melatonin in salt stress mitigation and thus can be implicated in the management of salinity in watermelon cultivation.
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Claims 6
Claim · model-written summary
NaCl inhibited photosynthesis.
- Taxon
- watermelon
Citrullus lanatuse0 - Organ / stage
- leavese0
- Treatment
- NaCl stresse0
- Outcome
- photosynthesise0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl stress inhibited photosynthesis and increased accumulation of reactive oxygen species and membrane damage in leaves of watermelon seedlings.”
Claim · model-written summary
NaCl increased reactive oxygen species accumulation and membrane damage.
- Taxon
- watermelonCitrullus lanatuse0
- Organ / stage
- leavese0
- Treatment
- NaCl stresse0
- Outcome
- accumulation of reactive oxygen species and membrane damagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl stress inhibited photosynthesis and increased accumulation of reactive oxygen species and membrane damage in leaves of watermelon seedlings.”
Claim · model-written summary
Root melatonin pretreatment dose dependently alleviated the photosynthetic decline.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- pretreatment with melatonin on rootse0
- Outcome
- photosynthetic ratee0
- Direction
- alleviatede0
- Qualifier
- dose-dependent mannere0
- Comparator
- NaCl-inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pretreatment with melatonin on roots alleviated NaCl-induced decrease in photosynthetic rate and oxidative stress in a dose-dependent manner.”
t0“Watermelon”
Claim · model-written summary
Root melatonin pretreatment dose dependently alleviated oxidative stress.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- pretreatment with melatonin on rootse0
- Outcome
- oxidative stresse0
- Direction
- alleviatede0
- Qualifier
- dose-dependent mannere0
- Comparator
- NaCl-inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pretreatment with melatonin on roots alleviated NaCl-induced decrease in photosynthetic rate and oxidative stress in a dose-dependent manner.”
t0“Watermelon”
Claim · model-written summary
Photosynthetic protection was associated with less stomatal closure and better PSII light absorption and transport.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- melatonine0
- Outcome
- protection of photosynthesise0
- Qualifier
- inhibition of stomatal closure and improved light energy absorption and electron transport in photosystem IIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The protection of photosynthesis by melatonin was closely associated with the inhibition of stomatal closure and improved light energy absorption and electron transport in photosystem II”
t0“Watermelon”
Claim · model-written summary
Melatonin-related oxidative stress reduction was attributed to redox homeostasis and antioxidant enzyme activity.
- Taxon
- watermelonCitrullus lanatust0
- Treatment
- melatonine0
- Outcome
- reduction of oxidative stresse0
- Qualifier
- improved redox homeostasis coupled with the enhanced activities of antioxidant enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction of oxidative stress by melatonin was attributed to the improved redox homeostasis coupled with the enhanced activities of antioxidant enzymes.”
t0“Watermelon”
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See all 7 papers →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.