Abstract
Grapevine, as a globally significant economic fruit tree, is highly sensitive to water stress, which not only damages its growth but also affects the formation of fruit quality. Melatonin (MT), acting as a signaling molecule, plays a crucial role in plant stress responses. However, the regulatory mechanisms of MT on grape leaf physiological characteristics and fruit quality under different irrigation amounts have not been fully elucidated. In this experiment, grape leaves were treated with a 150 μmol·L−1 MT solution at 0, 30, 60, and 90 days after flowering under different irrigation amounts (360, 300, 240, and 180 mm). It was found that MT significantly increased the contents of osmotic adjustment substances in leaves, reduced the level of reactive oxygen species, enhanced the activity of antioxidant enzymes, and promoted the metabolism of the ascorbic acid–glutathione cycle, thereby improving the antioxidant capacity of grapes and effectively alleviating the damage caused by a water deficit. At the same time, MT also maintains the dynamic balance of endogenous hormones by upregulating and downregulating the expression levels of related genes, thereby improving fruit quality. In summary, this study reveals the potential application value of MT in enhancing the drought resistance and fruit quality of grapes.
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Claims 9
Claim · model-written summary
Melatonin increased grape contents of osmotic adjustment substances in leaves under varying irrigation.
- Taxon
- grapee1
- Treatment
- 150 μmol·L−1 MT solutione1
- Outcome
- contents of osmotic adjustment substances in leavese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“MT significantly increased the contents of osmotic adjustment substances in leaves, reduced the level of reactive oxygen species, enhanced the activity of antioxidant enzymes, and promoted the metabolism of the ascorbic acid–glutathione cycle”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin reduced grape level of reactive oxygen species under varying irrigation.
- Taxon
- grapee1
- Treatment
- 150 μmol·L−1 MT solutione1
- Outcome
- level of reactive oxygen speciese0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“MT significantly increased the contents of osmotic adjustment substances in leaves, reduced the level of reactive oxygen species, enhanced the activity of antioxidant enzymes, and promoted the metabolism of the ascorbic acid–glutathione cycle”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin enhanced grape activity of antioxidant enzymes under varying irrigation.
- Taxon
- grapee1
- Treatment
- 150 μmol·L−1 MT solutione1
- Outcome
- activity of antioxidant enzymese0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“MT significantly increased the contents of osmotic adjustment substances in leaves, reduced the level of reactive oxygen species, enhanced the activity of antioxidant enzymes, and promoted the metabolism of the ascorbic acid–glutathione cycle”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin promoted grape metabolism of the ascorbic acid–glutathione cycle under varying irrigation.
- Taxon
- grapee1
- Treatment
- 150 μmol·L−1 MT solutione1
- Outcome
- metabolism of the ascorbic acid–glutathione cyclee0
- Direction
- promotede0
Not reportedComparator
Verbatim
e0“MT significantly increased the contents of osmotic adjustment substances in leaves, reduced the level of reactive oxygen species, enhanced the activity of antioxidant enzymes, and promoted the metabolism of the ascorbic acid–glutathione cycle”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin improved antioxidant capacity of grapes and alleviated water-deficit damage.
Verbatim
e0“improving the antioxidant capacity of grapes and effectively alleviating the damage caused by a water deficit”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin alleviated water-deficit damage in grapes.
- Taxon
- grapee1
- Treatment
- 150 μmol·L−1 MT solutione1
- Outcome
- damage caused by a water deficite0
- Direction
- alleviatinge0
Not reportedComparator
Verbatim
e0“effectively alleviating the damage caused by a water deficit”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin regulated expression of related genes upward and downward.
Verbatim
e0“upregulating and downregulating the expression levels of related genes”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin maintained endogenous hormone balance in grapes.
Verbatim
e0“MT also maintains the dynamic balance of endogenous hormones by upregulating and downregulating the expression levels of related genes”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
Claim · model-written summary
Melatonin improved grape fruit quality.
Not reportedComparator
Verbatim
e0“thereby improving fruit quality”
e1“grape leaves were treated with a 150 μmol·L−1 MT solution”
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