Abstract
Low temperature conditioning (LTC) alleviates peach fruit chilling injury but the underlying molecular basis is poorly understood. Here, changes in transcriptome, ethylene production, flesh softening, internal browning and membrane lipids were compared in fruit maintained in constant 0 °C and LTC (pre-storage at 8 °C for 5 d before storage at 0 °C). Low temperature conditioning resulted in a higher rate of ethylene production and a more rapid flesh softening as a result of higher expression of ethylene biosynthetic genes and a series of cell wall hydrolases. Reduced internal browning of fruit was observed in LTC, with lower transcript levels of polyphenol oxidase and peroxidase, but higher lipoxygenase. Low temperature conditioning fruit also showed enhanced fatty acid content, increased desaturation, higher levels of phospholipids and a preferential biosynthesis of glucosylceramide. Genes encoding cell wall hydrolases and lipid metabolism enzymes were coexpressed with differentially expressed ethylene response factors (ERFs) and contained ERF binding elements in their promoters. In conclusion, LTC is a special case of cold acclimation which increases ethylene production and, operating through ERFs, promotes both softening and changes in lipid composition and desaturation, which may modulate membrane stability, reducing browning and contributing to alleviation of peach fruit chilling injury.
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Claims 12
Claim · model-written summary
Conditioning increased ethylene production.
- Taxon
- peach
Prunus persicat0 - Treatment
- Low temperature conditioninge0
- Outcome
- ethylene productione0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“Low temperature conditioning resulted in a higher rate of ethylene production”
Claim · model-written summary
Conditioning accelerated flesh softening.
- Taxon
- peachPrunus persicat0
- Outcome
- flesh softeninge0
- Direction
- more rapide0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“a more rapid flesh softening”
Claim · model-written summary
Conditioning reduced internal browning.
- Taxon
- peachPrunus persicat0
- Treatment
- LTCe0
- Outcome
- internal browninge0
- Direction
- Reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“Reduced internal browning of fruit was observed in LTC”
Claim · model-written summary
Conditioned fruit had lower polyphenol oxidase and peroxidase transcripts.
- Taxon
- peachPrunus persicat0
- Gene
- polyphenol oxidase and peroxidasee0
- Outcome
- transcript levelse0
- Direction
- lowere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“with lower transcript levels of polyphenol oxidase and peroxidase”
Claim · model-written summary
Conditioned fruit had higher lipoxygenase transcripts.
- Taxon
- peachPrunus persicat0
- Outcome
- lipoxygenasee0
- Direction
- highere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“but higher lipoxygenase”
Claim · model-written summary
Conditioning enhanced fatty acid content.
- Taxon
- peachPrunus persicat0
- Treatment
- Low temperature conditioninge0
- Outcome
- fatty acid contente0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“Low temperature conditioning fruit also showed enhanced fatty acid content”
Claim · model-written summary
Conditioning increased desaturation.
- Taxon
- peachPrunus persicat0
- Outcome
- desaturatione0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“increased desaturation”
Claim · model-written summary
Conditioning raised phospholipid levels.
- Taxon
- peachPrunus persicat0
- Outcome
- levels of phospholipidse0
- Direction
- highere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“higher levels of phospholipids”
Claim · model-written summary
Conditioning favored glucosylceramide biosynthesis.
- Taxon
- peachPrunus persicat0
- Outcome
- biosynthesis of glucosylceramidee0
- Direction
- preferentiale0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“a preferential biosynthesis of glucosylceramide”
Claim · model-written summary
Cell wall hydrolase and lipid metabolism genes were coexpressed with ERFs.
- Taxon
- peachPrunus persicat0
- Gene
- Genes encoding cell wall hydrolases and lipid metabolism enzymese0
- Outcome
- coexpressede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“Genes encoding cell wall hydrolases and lipid metabolism enzymes were coexpressed with differentially expressed ethylene response factors (ERFs)”
Claim · model-written summary
The genes had ERF binding elements in their promoters.
- Taxon
- peachPrunus persicat0
- Outcome
- ERF binding elements in their promoterse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“contained ERF binding elements in their promoters”
Claim · model-written summary
Higher ethylene biosynthetic gene expression and cell wall hydrolases were linked to faster softening.
- Taxon
- peachPrunus persicat0
- Gene
- ethylene biosynthetic genes and a series of cell wall hydrolasese0
- Outcome
- flesh softeninge0
- Direction
- more rapide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach fruit”
e0“a more rapid flesh softening as a result of higher expression of ethylene biosynthetic genes and a series of cell wall hydrolases”
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See all 11 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.