Abstract
In order to determine the effects that 1-methylcyclopropene (1-MCP) may have on antioxidant metabolism during cold storage, apples ( Malus ×domestica Borkh. cv. Golden Smoothee) were treated with 625 nL·L −1 1-MCP immediately after harvest and stored in air for 3 months. Differences in total antioxidant activity and ascorbate levels were determined during storage and related to the activity of the antioxidant enzymes superoxide dismutase [SOD (EC 1.15.1.1)], catalase [CAT (EC 1.11.1.6)], and peroxidase [POX (EC 1.11.1.7)] in pulp. The level of oxidative stress in the pulp tissue was also established by determining changes in levels of hydrogen peroxide and in the content of peroxidative markers during storage. Controls and 1-MCP-treated fruit exhibited similar changes in total antioxidant activity and ascorbate levels. However, significant differences in oxidative stress levels were found between treated and untreated fruit. 1-MCP-treated fruit exhibited lower levels of hydrogen peroxide and significantly lower levels in peroxidative markers, especially at the end of the storage period. In line with this last result, 1-MCP-treated fruit also exhibited greater enzymatic antioxidant potential and, more specifically, a higher level of POX activity. Collectively, these results showed that 1-MCP did not detrimentally affect the antioxidant potential of the fruit and provided evidence to support the hypothesis that the beneficial effects of 1-MCP on ripening are not exclusively limited to its effect on ethylene, but also include direct effects on peroxidation and POX enzyme activity.
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Claims 7
Claim · model-written summary
Treated and control fruit had similar changes in antioxidant activity and ascorbate.
- Taxon
- Malus ×domestica Borkh. cv. Golden Smoothee
Malus domesticae1 - Treatment
- 1-MCP-treatede0
- Outcome
- total antioxidant activity and ascorbate levelse0
- Direction
- similar changese0
- Comparator
- Controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Controls and 1-MCP-treated fruit exhibited similar changes in total antioxidant activity and ascorbate levels.”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
Claim · model-written summary
Oxidative stress differed significantly between treated and untreated fruit.
- Taxon
- Malus ×domestica Borkh. cv. Golden SmootheeMalus domesticae1
- Treatment
- treatede0
- Outcome
- oxidative stress levelse0
- Comparator
- untreated fruite0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant differences in oxidative stress levels were found between treated and untreated fruit.”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
Claim · model-written summary
Treated fruit had lower hydrogen peroxide levels.
- Taxon
- Malus ×domestica Borkh. cv. Golden SmootheeMalus domesticae1
- Treatment
- 1-MCP-treatede0
- Outcome
- levels of hydrogen peroxidee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1-MCP-treated fruit exhibited lower levels of hydrogen peroxide”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
Claim · model-written summary
Treated fruit had significantly lower peroxidative markers, especially late in storage.
- Taxon
- Malus ×domestica Borkh. cv. Golden SmootheeMalus domesticae1
- Treatment
- 1-MCP-treatede2
- Outcome
- levels in peroxidative markerse0
- Direction
- lowere0
- Qualifier
- especially at the end of the storage periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly lower levels in peroxidative markers, especially at the end of the storage period.”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
e2“1-MCP-treated fruit exhibited lower levels of hydrogen peroxide”
Claim · model-written summary
Treated fruit showed greater enzymatic antioxidant potential.
- Taxon
- Malus ×domestica Borkh. cv. Golden SmootheeMalus domesticae1
- Treatment
- 1-MCP-treatede0
- Outcome
- enzymatic antioxidant potentiale0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1-MCP-treated fruit also exhibited greater enzymatic antioxidant potential”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
Claim · model-written summary
Treated fruit had higher POX activity.
- Taxon
- Malus ×domestica Borkh. cv. Golden SmootheeMalus domesticae1
- Treatment
- 1-MCP-treatede2
- Gene
- POXe0
- Outcome
- POX activitye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a higher level of POX activity.”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
e2“1-MCP-treated fruit also exhibited greater enzymatic antioxidant potential”
Claim · model-written summary
The authors infer that 1-MCP benefits ripening through effects on peroxidation and POX activity as well as ethylene.
- Taxon
- Malus ×domestica Borkh. cv. Golden SmootheeMalus domesticae1
- Treatment
- 1-MCPe0
- Gene
- POXe0
- Outcome
- beneficial effects of 1-MCP on ripeninge0
- Qualifier
- direct effects on peroxidation and POX enzyme activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the beneficial effects of 1-MCP on ripening are not exclusively limited to its effect on ethylene, but also include direct effects on peroxidation and POX enzyme activity.”
e1“apples ( Malus ×domestica Borkh. cv. Golden Smoothee)”
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See all 10 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.