Abstract
Melatonin, a small molecular weight indoleamine molecule, is involved in various biological processes and responses to environmental cues in plants. However, its function in abiotic stress response and the underlying mechanisms is less clear. In this study, we investigated the effect of melatonin on wheat seedlings growth under salt stress condition. Exogenous melatonin pretreatment partially mitigated the salt-induced inhibition of whole-plant growth as judged from shoot dry weight, IAA content, leaf photosynthesis rate, maximum photochemistry efficiency of photosystem II, and chlorophyll. The mitigation was also observed in reduced accumulation of H2O2 in melatonin-pretreated wheat seedlings exposed to salt stress. Exogenous melatonin increased endogenous melatonin content by evaluating the levels of TaSNAT transcript, which encodes a key regulatory enzyme in the melatonin biosynthetic pathway. Furthermore, melatonin increased polyamine contents by accelerating the metabolic flow from the precursor amino acids arginine and methionine to polyamines; melatonin also decreased the degradation of salt-induced polyamines. Taken together, these results provide the evidence that melatonin mitigates salt stress mainly through its regulation on polyamine metabolism of wheat seedlings.
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Claims 5
Claim · model-written summary
Melatonin pretreatment partially mitigated salt induced inhibition of wheat seedling growth and physiological traits.
- Taxon
- wheat seedlings
Triticum aestivumt0 - Treatment
- Exogenous melatonin pretreatmente0
- Outcome
- whole-plant growthe0
- Direction
- partially mitigatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous melatonin pretreatment partially mitigated the salt-induced inhibition of whole-plant growth as judged from shoot dry weight, IAA content, leaf photosynthesis rate, maximum photochemistry efficiency of photosystem II, and chlorophyll”
t0“Wheat Seedlings”
Claim · model-written summary
Melatonin pretreatment reduced H2O2 accumulation in salt stressed wheat seedlings.
- Taxon
- wheat seedlingsTriticum aestivume0
- Treatment
- melatonin-pretreatede0
- Outcome
- accumulation of H2O2e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced accumulation of H2O2 in melatonin-pretreated wheat seedlings exposed to salt stress”
Claim · model-written summary
Exogenous melatonin increased endogenous melatonin content.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- Exogenous melatonine0
- Gene
- TaSNATe0
- Outcome
- endogenous melatonin contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous melatonin increased endogenous melatonin content by evaluating the levels of TaSNAT transcript”
t0“Wheat Seedlings”
Claim · model-written summary
Melatonin increased polyamine contents by accelerating flow from arginine and methionine.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- melatonine0
- Outcome
- polyamine contentse0
- Direction
- increasede0
- Qualifier
- accelerating the metabolic flowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melatonin increased polyamine contents by accelerating the metabolic flow from the precursor amino acids arginine and methionine to polyamines”
t0“Wheat Seedlings”
Claim · model-written summary
Melatonin decreased degradation of salt induced polyamines.
- Taxon
- wheat seedlingsTriticum aestivumt0
- Treatment
- melatonine0
- Outcome
- degradation of salt-induced polyaminese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melatonin also decreased the degradation of salt-induced polyamines”
t0“Wheat Seedlings”
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