Abstract
Melatonin improves the tolerance of plants to various environmental stresses by protecting plant cells against oxidative stress damage. The objective of the current study was to determine whether exogenous melatonin (MT) treatments could help protecting peanut (Arachis hypogaea) seedlings against salinity stress. This was achieved by investigating enzymatic and non-enzymatic antioxidant systems and the expression of melatonin biosynthesis related genes in response to salinity stress with or without exogenous MT. The results showed a significant increase in the concentrations of reactive oxygen species (ROS) in peanut seedlings under salinity stress. The exogenous application of melatonin decreased the levels of ROS through the activation of antioxidant enzymes in peanut seedlings under salinity stress. Transcription levels of melatonin biosynthesis related genes such as N-acetylserotonin methyltransferase (ASMT1, ASMT2, ASMT3), tryptophan decarboxylase (TDC), and tryptamine 5-hydroxylase (T5H) were up-regulated with a 150 µM melatonin treatment under salinity stress. The results indicated that melatonin regulated the redox homeostasis by its ability to induce either enzymatic or non-enzymatic antioxidant systems. In addition, phylogenetic analysis of melatonin biosynthesis genes (ASMT1, ASMT2, ASMT3, TDC, T5H) were performed on a total of 56 sequences belonging to various plant species including five new sequences extracted from Arachis hypogaea (A. hypogaea). This was based on pairwise comparison among aligned nucleotides and predicted amino acids as well as on substitution rates, and phylogenetic inference. The analyzed sequences were heterogeneous and the A. hypogaea accessions were primarily closest to those of Manihot esculenta, but this needs further clarification.
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Claims 7
Claim · model-written summary
Reactive oxygen species concentrations increased significantly in peanut seedlings under salinity stress.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- salinity stresse1
- Outcome
- concentrations of reactive oxygen species (ROS)e1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“a significant increase in the concentrations of reactive oxygen species (ROS) in peanut seedlings under salinity stress”
Claim · model-written summary
Exogenous melatonin decreased ROS levels through activation of antioxidant enzymes in peanut seedlings under salinity stress.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- exogenous application of melatonine1
- Outcome
- levels of ROSe1
- Direction
- decreasede1
- Qualifier
- through the activation of antioxidant enzymese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“The exogenous application of melatonin decreased the levels of ROS through the activation of antioxidant enzymes in peanut seedlings under salinity stress”
Claim · model-written summary
ASMT1, ASMT2 and ASMT3 transcription was up-regulated by 150 µM melatonin under salinity stress.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- 150 µM melatonin treatmente1
- Gene
- ASMT1, ASMT2, ASMT3e1
- Outcome
- Transcription levelse1
- Direction
- up-regulatede1
- Qualifier
- under salinity stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“Transcription levels of melatonin biosynthesis related genes such as N-acetylserotonin methyltransferase (ASMT1, ASMT2, ASMT3), tryptophan decarboxylase (TDC), and tryptamine 5-hydroxylase (T5H) were up-regulated with a 150 µM melatonin treatment under salinity stress”
Claim · model-written summary
TDC and T5H transcription was up-regulated by 150 µM melatonin under salinity stress.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- 150 µM melatonin treatmente1
- Gene
- tryptophan decarboxylase (TDC), and tryptamine 5-hydroxylase (T5H)e1
- Outcome
- Transcription levelse1
- Direction
- up-regulatede1
- Qualifier
- under salinity stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“Transcription levels of melatonin biosynthesis related genes such as N-acetylserotonin methyltransferase (ASMT1, ASMT2, ASMT3), tryptophan decarboxylase (TDC), and tryptamine 5-hydroxylase (T5H) were up-regulated with a 150 µM melatonin treatment under salinity stress”
Claim · model-written summary
Melatonin regulated redox homeostasis by inducing enzymatic and non-enzymatic antioxidant systems.
- Taxon
- PeanutArachis hypogaeat0
- Compound
- melatonine1
- Outcome
- redox homeostasise1
- Qualifier
- by its ability to induce either enzymatic or non-enzymatic antioxidant systemse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“melatonin regulated the redox homeostasis by its ability to induce either enzymatic or non-enzymatic antioxidant systems”
Claim · model-written summary
Phylogenetic analysis of 56 melatonin biosynthesis gene sequences included five new sequences extracted from Arachis hypogaea.
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- five new sequences extracted from Arachis hypogaeae1
- Value
- 56 sequencese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“a total of 56 sequences belonging to various plant species including five new sequences extracted from Arachis hypogaea”
Claim · model-written summary
Arachis hypogaea accessions were primarily closest to those of Manihot esculenta in the phylogeny.
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- primarily closest to those of Manihot esculentae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Peanut”
e1“the A. hypogaea accessions were primarily closest to those of Manihot esculenta”
The same questions in other papers
melatonin · physiology: oxidative · Arachis hypogaea (peanut)Results agree
2 papers in the same direction as this paper
- positive
- positive
melatonin · molecular: expression · Arachis hypogaea (peanut)Results agree
2 papers in the same direction as this paper
- positive
- positive
salinity · physiology: oxidative · Arachis hypogaea (peanut)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.