Abstract
Cold stress is one of the most detrimental environmental factors affecting plant growth and development. Melatonin (MEL), a natural indoleamine compound, responds to various environmental cues. To explore the role of MEL in the response of melon (Cucumis melo L.) seedlings to cold stress, the effects of exogenous MEL on the ascorbate–glutathione (AsA–GSH) cycle and proline metabolism were investigated. Melon seedlings were sprayed with various concentrations of MEL (0, 50, 100, 200, or 400 μM), then exposed to cold stress, 12/6°C (day/night) for 7 d, followed by recovery at 28/18°C for another 7 d. The results showed that MEL, especially the 200 μM treatment, dramatically alleviated growth inhibition caused by cold stress, manifested by increased plant growth and decreased O2•¯ production rate and malondialdehyde content. Importantly, exogenous application of MEL enhanced the ratios of reduced and oxidized forms of AsA (AsA/DHA) and GSH (GSH/GSSG), and the activities of ascorbate peroxidase (APX), glutathione reductase (GR), and dehydroascorbate reductase (DHAR) involved in the ascorbate–glutathione (AsA–GSH) cycle in melon seedings grown under cold stress. Besides, MEL pretreatment further increased the contents of proline and soluble protein under cold stress. The results reveal that protective effects of MEL against cold stress in melon seedlings are most likely associated with the regulation of the AsA–GSH cycle and proline metabolism as an effective antioxidant system.
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Claims 6
Claim · model-written summary
Melatonin at 200 μM dramatically alleviated cold-induced growth inhibition in melon seedlings.
- Taxon
- melon
.jpg?width=60)
Cucumis melot0 - Treatment
- MEL, especially the 200 μM treatmente0
- Outcome
- growth inhibitione0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“melon seedlings (Cucumis melo L.)”
e0“MEL, especially the 200 μM treatment, dramatically alleviated growth inhibition caused by cold stress”
Claim · model-written summary
Melatonin decreased the O2•¯ production rate and malondialdehyde content under cold stress.
- Taxon
- melonCucumis melot0
- Treatment
- MELe0
- Outcome
- O2•¯ production rate and malondialdehyde contente1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“melon seedlings (Cucumis melo L.)”
e0“MEL, especially the 200 μM treatment, dramatically alleviated growth inhibition caused by cold stress”
e1“decreased O2•¯ production rate and malondialdehyde content”
Claim · model-written summary
Exogenous melatonin enhanced the AsA/DHA and GSH/GSSG ratios in cold-stressed melon seedlings.
- Taxon
- melonCucumis melot0
- Treatment
- exogenous application of MELe0
- Outcome
- ratios of reduced and oxidized forms of AsA (AsA/DHA) and GSH (GSH/GSSG)e0
- Direction
- enhancede0
- Qualifier
- under cold stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“melon seedlings (Cucumis melo L.)”
e0“exogenous application of MEL enhanced the ratios of reduced and oxidized forms of AsA (AsA/DHA) and GSH (GSH/GSSG)”
e1“in melon seedings grown under cold stress”
Claim · model-written summary
Exogenous melatonin enhanced the activities of APX, GR and DHAR in cold-stressed melon seedlings.
- Taxon
- melonCucumis melot0
- Treatment
- exogenous application of MELe0
- Outcome
- activities of ascorbate peroxidase (APX), glutathione reductase (GR), and dehydroascorbate reductase (DHAR)e2
- Direction
- enhancede0
- Qualifier
- under cold stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“melon seedlings (Cucumis melo L.)”
e0“exogenous application of MEL enhanced the ratios of reduced and oxidized forms of AsA (AsA/DHA) and GSH (GSH/GSSG)”
e1“in melon seedings grown under cold stress”
e2“the activities of ascorbate peroxidase (APX), glutathione reductase (GR), and dehydroascorbate reductase (DHAR)”
Claim · model-written summary
MEL pretreatment further increased the contents of proline and soluble protein under cold stress.
- Taxon
- melonCucumis melot0
- Treatment
- MEL pretreatmente0
- Outcome
- contents of proline and soluble proteine0
- Direction
- increasede0
- Qualifier
- under cold stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“melon seedlings (Cucumis melo L.)”
e0“MEL pretreatment further increased the contents of proline and soluble protein under cold stress”
Claim · model-written summary
The protective effects of melatonin against cold stress are most likely associated with the AsA-GSH cycle and proline metabolism.
- Taxon
- melonCucumis melot0
- Outcome
- protective effects of MEL against cold stresse0
- Qualifier
- the regulation of the AsA–GSH cycle and proline metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“melon seedlings (Cucumis melo L.)”
e0“protective effects of MEL against cold stress in melon seedlings are most likely associated with the regulation of the AsA–GSH cycle and proline metabolism as an effective antioxidant system”
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See all 6 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.