Abstract
Low temperature disorders of nectarines are thought to be expressions of chilling injury. Chilling injury is a form of stress usually associated with increased synthesis of ethylene and its immediate precursor, aminocyclopropane-1-carboxylic acid (ACC). However, other mechanisms for the development of chilling injury have been proposed. To help determine the nature of the processes leading to chilling injury in nectarines (Prunus persica) and how the gaseous composition of the storage atmosphere effects the development of low temperature disorders, levels of ACC and conjugated ACC were measured in fruit of the cv. Arctic Snow. These compounds were measured in fruit ripened at 20°C immediately after harvest, in fruit on removal from cold storage and in fruit ripened at 20°C following cold storage. During storage, fruit were kept at 0°C in the 4 following atmospheres: air; air + 15% CO2; air + 15 µL/L ethylene; and air + 15% CO2 + 15 µL/L ethylene. Concentrations of ACC remained low in all treatments and no significant changes in ACC levels due to added ethylene or CO2 were observed. Concentrations of conjugated ACC were about 10-times that of ACC and again were not influenced by the composition of the storage atmosphere. No significant changes in either ACC or conjugated ACC were observed until after flesh bleeding, the major symptoms of low temperature disorder expressed in these fruit, had begun to appear. It was concluded that disorders in nectarines stored at low temperatures are not a stress response involving a disruption of ethylene metabolism but may be associated with differential changes in the metabolism of enzymes associated with normal ripening.
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Claims 7
Claim · model-written summary
ACC concentrations stayed low across all storage atmospheres.
- Taxon
- Prunus persica
Prunus persicae1 - Outcome
- Concentrations of ACCe0
- Qualifier
- all treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of ACC remained low in all treatments”
e1“nectarines (Prunus persica)”
Claim · model-written summary
Added ethylene or CO2 caused no significant change in ACC levels.
- Taxon
- Prunus persicaPrunus persicae1
- Treatment
- added ethylene or CO2e0
- Outcome
- ACC levelse0
- Direction
- no significant changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant changes in ACC levels due to added ethylene or CO2 were observed”
e1“nectarines (Prunus persica)”
Claim · model-written summary
Conjugated ACC concentrations were about ten times ACC concentrations.
- Taxon
- Prunus persicaPrunus persicae1
- Outcome
- Concentrations of conjugated ACCe0
- Direction
- 10-timese0
- Value
- 10-timese0
- Comparator
- ACCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of conjugated ACC were about 10-times that of ACC”
e1“nectarines (Prunus persica)”
Claim · model-written summary
Storage atmosphere did not influence conjugated ACC concentrations.
- Taxon
- Prunus persicaPrunus persicae1
- Treatment
- composition of the storage atmospheree0
- Outcome
- Concentrations of conjugated ACCe0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of conjugated ACC were about 10-times that of ACC and again were not influenced by the composition of the storage atmosphere”
e1“nectarines (Prunus persica)”
Claim · model-written summary
ACC and conjugated ACC did not change significantly until flesh bleeding had begun.
- Taxon
- Prunus persicaPrunus persicae1
- Outcome
- ACC or conjugated ACCe0
- Direction
- No significant changese0
- Qualifier
- until after flesh bleedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant changes in either ACC or conjugated ACC were observed until after flesh bleeding, the major symptoms of low temperature disorder expressed in these fruit, had begun to appear”
e1“nectarines (Prunus persica)”
Claim · model-written summary
The authors concluded low temperature nectarine disorders do not involve disruption of ethylene metabolism.
- Taxon
- Prunus persicaPrunus persicae1
- Outcome
- disorders in nectarines stored at low temperaturese0
- Qualifier
- not a stress response involving a disruption of ethylene metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorders in nectarines stored at low temperatures are not a stress response involving a disruption of ethylene metabolism”
e1“nectarines (Prunus persica)”
Claim · model-written summary
The authors proposed possible association of low temperature disorders with differential enzyme metabolism during ripening.
- Taxon
- Prunus persicaPrunus persicae2
- Outcome
- disorders in nectarines stored at low temperaturese1
- Qualifier
- differential changes in the metabolism of enzymes associated with normal ripeninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“may be associated with differential changes in the metabolism of enzymes associated with normal ripening”
e1“disorders in nectarines stored at low temperatures”
e2“nectarines (Prunus persica)”
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See all 15 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.