Abstract
Early ripening apples are usually used for fresh marketing because of short storage life, although they are with high acid and low sugar contents. Understanding the malate metabolism in fleshy fruit and underpinning process during ripening is crucial for particular crop improvement where acidity is a concern for direct consumption or further processing. In this research, a traditional Chinese apple cultivar 'Hongyu', which belongs to early ripening apple cultivar, were freshly harvested at commercial maturity stage (120 Days after full bloom) and used for different storage temperature (4°C, 20°C) and UV-C treatment (following storage at 20°C after treatment). Simple sugars (glucose, sucrose, and fructose) and organic acids (malic, and oxalic) were assessed after 14 d of storage. Compared to fruits stored at 20°C, the malate content in fruits stored at 4°C significantly higher, while it was decreased significantly in UV-C treated fruits stored at 20°C after 14 d of storage. The sugar content was almost similar throughout the UV-C-treated fruits and fruits stored at different temperature. The higher ratios of total sugars to total organic acids in UV-C treated fruits after 14 d suggest that UV-C treatment has the potential to improve the taste of early ripening apple cultivars. Considering the significant difference in malate the samples at 14 d of storage were subjected for RNA-seq analysis. Transcriptome analysis revealed that the phenomena underlying this change were governed by metabolism of malate by the regulation of NADP-malic enzyme (NADP-ME) and phosphoenolpyruvate carboxylase kinase (PEPCK) in apple during postharvest storage. This transcriptome profiling results have specified the transcript regulation of malate metabolism and lead to possible taste improvement without affecting the other fruit quality attributes.
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Claims 6
Claim · model-written summary
At 4°C, fruit malate content was significantly higher than at 20°C.
- Taxon
- apple
Malus domesticat0 - Organ / stage
- fruitse0
- Treatment
- 4°Ce0
- Outcome
- malate contente0
- Direction
- highere0
- Comparator
- 20°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to fruits stored at 20°C, the malate content in fruits stored at 4°C significantly higher”
t0“apple”
Claim · model-written summary
UV-C decreased fruit malate content after 14 days at 20°C.
- Taxon
- appleMalus domesticat0
- Treatment
- UV-Ce0
- Outcome
- malate contente0
- Direction
- decreasede0
- Qualifier
- after 14 d of storagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to fruits stored at 20°C, the malate content in fruits stored at 4°C significantly higher, while it was decreased significantly in UV-C treated fruits stored at 20°C after 14 d of storage”
t0“apple”
Claim · model-written summary
Sugar content was almost similar across UV-C and temperature treatments.
- Taxon
- appleMalus domesticat0
- Treatment
- UV-C-treatede0
- Outcome
- sugar contente0
- Direction
- almost similare0
- Comparator
- fruits stored at different temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sugar content was almost similar throughout the UV-C-treated fruits and fruits stored at different temperature”
t0“apple”
Claim · model-written summary
UV-C-treated fruit had higher sugar-to-organic-acid ratios after 14 days.
- Taxon
- appleMalus domesticat0
- Treatment
- UV-Ce0
- Outcome
- ratios of total sugars to total organic acidse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher ratios of total sugars to total organic acids in UV-C treated fruits after 14 d suggest that UV-C treatment has the potential to improve the taste of early ripening apple cultivars”
t0“apple”
Claim · model-written summary
The authors suggest UV-C may improve taste.
- Taxon
- appleMalus domesticat0
- Outcome
- potential to improve the tastee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher ratios of total sugars to total organic acids in UV-C treated fruits after 14 d suggest that UV-C treatment has the potential to improve the taste of early ripening apple cultivars”
t0“apple”
Claim · model-written summary
Transcriptome analysis implicated NADP-ME and PEPCK regulation in postharvest malate metabolism.
- Taxon
- appleMalus domesticae0
- Gene
- NADP-malic enzyme (NADP-ME) and phosphoenolpyruvate carboxylase kinase (PEPCK)e0
- Outcome
- metabolism of malatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transcriptome analysis revealed that the phenomena underlying this change were governed by metabolism of malate by the regulation of NADP-malic enzyme (NADP-ME) and phosphoenolpyruvate carboxylase kinase (PEPCK) in apple during postharvest storage”
The same questions in other papers
uv · quality: sugar starch · Malus domestica (apple)Positive and negative results
1 in the opposite direction
- no effect
uv · molecular: metabolites · Malus domestica (apple)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 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.