Abstract
Fresh fruit and vegetables are highly perishable because of their active metabolism during the postharvest phase. Previous studies showed that hormic dose of UV cause a delay in the senescence of tomato fruit by about 7 days. The objective of this study was to elucidate whether UV acts on the cell membrane in producing the phenomenon of delayed senescence, since it is known that UV radiation can provoke photooxidation of membrane lipids. Membrane lipid peroxidation was studied in tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose, and was followed by assaying products of lipid oxidation during the storage period. We observed the production of lipofuscin-like compounds, malondialdehyde, aldehydes, pentane, ethane, and hydrogen peroxide within few days of the treatment. An increase in the efflux of electrolytes (total, potassium, and calcium) was also observed. An immediate increase in the level of these products of oxidation supports the hypothesis that UV radiation induces membrane lipid peroxidation. However, beyond 5 to 7 days after treatment, the production of oxidation products and electrolyte leakage were lower than the control fruits. Thereafter, the level of products of lipid oxidation associated with senescence was higher in control fruits than in treated ones. Results suggest that the initial oxidation stress by the exposure to UV led to biochemical reactions inducing the production of stress compounds, such as polyamines, which are non specific antioxidants. Consequently, a delay in the senescence was observed.
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Claims 8
Claim · model-written summary
Previous studies showed that a hormic UV dose delays senescence of tomato fruit by about 7 days.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- fruite0
- Treatment
- hormic dose of UVe0
- Outcome
- senescencee0
- Direction
- delaye0
- Value
- about 7 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Previous studies showed that hormic dose of UV cause a delay in the senescence of tomato fruit by about 7 days”
Claim · model-written summary
Tomato fruit treated with a hormic UV dose produced lipofuscin-like compounds, malondialdehyde and aldehydes within few days of the treatment.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Treatment
- hormic UV dosee0
- Outcome
- production of lipofuscin-like compounds, malondialdehyde, aldehydese1
- Direction
- increaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“We observed the production of lipofuscin-like compounds, malondialdehyde, aldehydes, pentane, ethane, and hydrogen peroxide within few days of the treatment”
Claim · model-written summary
Tomato fruit treated with a hormic UV dose produced pentane, ethane and hydrogen peroxide within few days of the treatment.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Treatment
- hormic UV dosee0
- Outcome
- pentane, ethane, and hydrogen peroxidee1
- Direction
- increaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“We observed the production of lipofuscin-like compounds, malondialdehyde, aldehydes, pentane, ethane, and hydrogen peroxide within few days of the treatment”
Claim · model-written summary
An increase in the efflux of electrolytes (total, potassium and calcium) was observed in UV-treated tomato fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Treatment
- hormic UV dosee0
- Outcome
- efflux of electrolytese1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“An increase in the efflux of electrolytes (total, potassium, and calcium) was also observed”
Claim · model-written summary
Beyond 5 to 7 days after treatment, production of oxidation products and electrolyte leakage were lower in UV-treated fruit than in control fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Treatment
- hormic UV dosee0
- Outcome
- production of oxidation products and electrolyte leakagee1
- Direction
- lowere1
- Comparator
- control fruitse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“beyond 5 to 7 days after treatment, the production of oxidation products and electrolyte leakage were lower than the control fruits”
Claim · model-written summary
The level of lipid oxidation products associated with senescence was higher in control fruit than in treated fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Treatment
- hormic UV dosee0
- Outcome
- level of products of lipid oxidation associated with senescencee1
- Direction
- highere1
- Comparator
- control fruitse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“the level of products of lipid oxidation associated with senescence was higher in control fruits than in treated ones”
Claim · model-written summary
The authors suggest that initial oxidation stress from UV exposure led to biochemical reactions producing stress compounds such as polyamines.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- exposure to UVe1
- Compound
- polyaminese1
- Outcome
- production of stress compoundse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“Results suggest that the initial oxidation stress by the exposure to UV led to biochemical reactions inducing the production of stress compounds, such as polyamines”
Claim · model-written summary
A delay in senescence was observed in UV-treated tomato fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruite0
- Treatment
- hormic UV dosee0
- Outcome
- senescencee1
- Direction
- delaye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato fruit ( Lycopersicon esculentum Mill cv. Trust) treated by hormic UV dose”
e1“a delay in the senescence was observed”
The same questions in other papers
uv · quality: postharvest · Solanum lycopersicum (tomato)Results differ
11 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
10 papers more in this group
See all 14 papers →uv · physiology: oxidative · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- negative
2 papers more in this group
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.