Abstract
Postharvest senescence of vegetables is characterized by the degradation of pigments and proteins. Protein degradation is often accompanied by the accumulation of amino acids and ammonium since the separated plant tissues cannot recycle nitrogen. Although it is known that treatments with low-intensity white- or red-light delay protein degradation during postharvest in kale, the effect of LED lighting on nitrogen metabolism is poorly studied. The objective of this work was to evaluate the effects of LED treatments on nitrogen metabolism during postharvest kale. Three treatments were performed: control, 20–25 µmol m−2 s−1 of white light or red light for 1 h. Nitrogen content remained unchanged. In the control, protein content decreased and was accompanied by the accumulation of amino acids and ammonium. In contrast, in both white and red LED light-treated leaves, protein content remained higher, and the accumulation of derivatives was delayed. Glutamine synthetase activity decreased more rapidly during storage in control than in treatments, which is related to a greater accumulation of ammonium. LED light treatments maintained a higher ascorbic acid content in kale leaves than in controls. This work demonstrates that low-intensity white or red LED treatments delay changes in postharvest nitrogen metabolism and improve the nutritional quality of kale leaves.
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Claims 9
Claim · model-written summary
Nitrogen content remained unchanged across postharvest treatments.
- Taxon
- kale
Brassica oleracea var. viridist0 - Outcome
- Nitrogen contente0
- Direction
- unchangede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen content remained unchanged”
t0“kale”
Claim · model-written summary
Protein content decreased in control kale during storage.
- Taxon
- kaleBrassica oleracea var. viridist0
- Outcome
- protein contente0
- Direction
- decreasede0
- Qualifier
- In the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the control, protein content decreased and was accompanied by the accumulation of amino acids and ammonium”
t0“kale”
Claim · model-written summary
Amino acids and ammonium accumulated in control kale.
- Taxon
- kaleBrassica oleracea var. viridist0
- Outcome
- accumulation of amino acids and ammoniume0
- Qualifier
- In the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the control, protein content decreased and was accompanied by the accumulation of amino acids and ammonium”
t0“kale”
Claim · model-written summary
White LED treatment kept protein content higher than control.
- Taxon
- kaleBrassica oleracea var. viridist0
- Treatment
- whitee0
- Outcome
- protein contente0
- Direction
- highere0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both white and red LED light-treated leaves, protein content remained higher”
t0“kale”
e1“In the control, protein content decreased”
Claim · model-written summary
Red LED treatment kept protein content higher than control.
- Taxon
- kaleBrassica oleracea var. viridist0
- Treatment
- red LED lighte0
- Outcome
- protein contente0
- Direction
- highere0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both white and red LED light-treated leaves, protein content remained higher”
t0“kale”
e1“In the control, protein content decreased”
Claim · model-written summary
White LED delayed accumulation of nitrogen derivatives.
- Taxon
- kaleBrassica oleracea var. viridist0
- Treatment
- whitee0
- Outcome
- accumulation of derivativese0
- Direction
- delayede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both white and red LED light-treated leaves, protein content remained higher, and the accumulation of derivatives was delayed”
t0“kale”
e1“In the control, protein content decreased”
Claim · model-written summary
Red LED delayed accumulation of nitrogen derivatives.
- Taxon
- kaleBrassica oleracea var. viridist0
- Treatment
- red LED lighte0
- Outcome
- accumulation of derivativese0
- Direction
- delayede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both white and red LED light-treated leaves, protein content remained higher, and the accumulation of derivatives was delayed”
t0“kale”
e1“In the control, protein content decreased”
Claim · model-written summary
Glutamine synthetase activity declined more rapidly in control than LED-treated kale.
- Taxon
- kaleBrassica oleracea var. viridist0
- Gene
- Glutamine synthetasee0
- Outcome
- Glutamine synthetase activitye0
- Direction
- decreased more rapidlye0
- Comparator
- treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glutamine synthetase activity decreased more rapidly during storage in control than in treatments, which is related to a greater accumulation of ammonium”
t0“kale”
Claim · model-written summary
LED light maintained higher ascorbic acid content than controls.
- Taxon
- kaleBrassica oleracea var. viridise0
- Treatment
- LED light treatmentse0
- Outcome
- ascorbic acid contente0
- Direction
- highere0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LED light treatments maintained a higher ascorbic acid content in kale leaves than in controls”
The same questions in other papers
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- no effect
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See all 34 papers →light · molecular: metabolites · Brassica oleracea (wild cabbage)Positive and negative results
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- negative
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See all 34 papers →light · quality: protein · Brassica oleracea (wild cabbage)Results agree
1 paper in the same direction as this paper
- positive
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.