Abstract
The aim of this research was to understand the involvement of the carbohydrate metabolism in physiological disorders occurring during the postharvest storage of citrus fruit. These disorders, manifested in the rind, depreciate fruit quality and often originate important losses. There has been increasing interest in the use of nonharmful treatments, such as high-temperature conditioning, to avoid citrus peel damage during fruit storage at low temperature in chilling-sensitive cultivars, but their influence in postharvest disorders occurring at nonchilling temperatures and the mechanisms related to them are poorly understood. The data obtained showed that heat conditioning (3 days/37 degrees C) increases the chilling tolerance of cv. Navelate fruit and favored sucrose, but not hexoses, accumulation and its maintenance after the fruit was transferred to low temperature. This effect was related to heat-induced increase in the activities of the sucrose-synthesizing enzymes sucrose phosphate synthase (SPS) and sucrose synthase (SS). Furthermore, sucrose levels and the activities of both enzymes were higher in cv. Pinalate oranges, a chilling-tolerant spontaneous abscisic acid deficient mutant of Navelate. In contrast, carbohydrates appeared not to be involved in the susceptibility of oranges to rind staining, a physiological disorder different from chilling injury, which mainly occurred at a nonchilling temperature (12 degrees C) and was not reduced by heat conditioning. The effect of low temperature in SS and SPS activities was less than that of high temperature, which might be related to the lower changes occurring in sucrose during fruit storage at 2 degrees C.
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Claims 7
Claim · model-written summary
Heat conditioning increased chilling tolerance in Navelate fruit.
- Material
- cv. Navelatee0
- Treatment
- heat conditioning (3 days/37 degrees C)e0
- Outcome
- chilling tolerancee0
- Direction
- increasese0
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat conditioning (3 days/37 degrees C) increases the chilling tolerance of cv. Navelate fruit”
t0“Citrus Fruit”
Claim · model-written summary
Heat conditioning favored sucrose accumulation and its maintenance after transfer to cold storage.
- Treatment
- heat conditioningt1
- Outcome
- sucrose, but not hexoses, accumulation and its maintenancee0
- Direction
- favorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“favored sucrose, but not hexoses, accumulation and its maintenance after the fruit was transferred to low temperature”
t0“Citrus Fruit”
t1“heat conditioning (3 days/37 degrees C)”
Claim · model-written summary
Heat conditioning increased sucrose phosphate synthase and sucrose synthase activities.
- Treatment
- heate0
- Outcome
- activities of the sucrose-synthesizing enzymes sucrose phosphate synthase (SPS) and sucrose synthase (SS)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat-induced increase in the activities of the sucrose-synthesizing enzymes sucrose phosphate synthase (SPS) and sucrose synthase (SS)”
t0“Citrus Fruit”
Claim · model-written summary
Pinalate oranges had higher sucrose levels than Navelate.
Verbatim
e0“sucrose levels and the activities of both enzymes were higher in cv. Pinalate oranges, a chilling-tolerant spontaneous abscisic acid deficient mutant of Navelate”
Claim · model-written summary
Pinalate oranges had higher activities of both sucrose-synthesizing enzymes.
Verbatim
e0“sucrose levels and the activities of both enzymes were higher in cv. Pinalate oranges, a chilling-tolerant spontaneous abscisic acid deficient mutant of Navelate”
Claim · model-written summary
Heat conditioning did not reduce rind staining at nonchilling temperature.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rind staining, a physiological disorder different from chilling injury, which mainly occurred at a nonchilling temperature (12 degrees C) and was not reduced by heat conditioning.”
t0“Citrus Fruit”
Claim · model-written summary
Low temperature changed SS and SPS activities less than high temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of low temperature in SS and SPS activities was less than that of high temperature”
t0“Citrus Fruit”
The same questions in other papers
heat · molecular: metabolites · CitrusPositive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- 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.