Abstract
Yellowing of broccoli is a crucial limiting factor for its commercial value and consumer acceptance during postharvest. In this study, the impacts of exogenous melatonin (MEL) on chlorophyll content and fluorescence, as well as ultrastructure and membrane lipid metabolism of chloroplasts in broccoli were investigated during postharvest. The results showed that MEL treatment (200 μmol · L-1) maintained the chlorophyll content, chloroplast autofluorescence and integral structure, and reduced the level ofserotonin in the chloroplasts in broccoli. Also, MEL treatment inhibited the membrane lipid peroxidation of chloroplasts, as indicated by low levels of superoxide anion (O2.-), hydrogen peroxide (H2O2) and malondialdehyde (MDA), and high levels of endogenous MEL. In addition, the stability and fluidity of chloroplast membranes were also better maintained in the treated broccoli via increasing the contents of phosphatidylglyceroland (PG), monogalactosyldiglyceride (MGDG), digalactosyldiglyceride (DGDG) and unsaturated fatty acids as well as decreasing saturated fatty acid content and the activities of lipoxygenase (LOX) and lipase (LPS). Thus, the application of MEL facilitated the maintenance of chloroplast integrity, thus contributing to yellowing postponement and the extension of the storage life of broccoli.
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Claims 12
Claim · model-written summary
MEL maintained chlorophyll content and chloroplast autofluorescence.
- Taxon
- broccoli
Brassica oleracea var. italicat0 - Treatment
- MEL treatment (200 μmol · L-1)e0
- Outcome
- chlorophyll content, chloroplast autofluorescencee0
- Direction
- maintainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MEL treatment (200 μmol · L-1) maintained the chlorophyll content, chloroplast autofluorescence and integral structure”
t0“broccoli”
Claim · model-written summary
MEL maintained chloroplast integral structure.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- MEL treatment (200 μmol · L-1)e0
- Outcome
- integral structuree0
- Direction
- maintainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MEL treatment (200 μmol · L-1) maintained the chlorophyll content, chloroplast autofluorescence and integral structure”
t0“broccoli”
Claim · model-written summary
MEL reduced serotonin in broccoli chloroplasts.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Treatment
- MELt0
- Outcome
- level ofserotonin in the chloroplastse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced the level ofserotonin in the chloroplasts in broccoli.”
t0“melatonin”
Claim · model-written summary
MEL inhibited chloroplast membrane lipid peroxidation.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- MEL treatmente0
- Outcome
- membrane lipid peroxidation of chloroplastse0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MEL treatment inhibited the membrane lipid peroxidation of chloroplasts”
t0“broccoli”
Claim · model-written summary
MEL treated chloroplasts had low superoxide anion, hydrogen peroxide and malondialdehyde.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- low levels of superoxide anion (O2.-), hydrogen peroxide (H2O2) and malondialdehyde (MDA)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low levels of superoxide anion (O2.-), hydrogen peroxide (H2O2) and malondialdehyde (MDA)”
t0“broccoli”
Claim · model-written summary
MEL treated chloroplasts had high endogenous MEL.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- high levels of endogenous MELe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high levels of endogenous MEL.”
t0“broccoli”
Claim · model-written summary
MEL maintained chloroplast membrane stability and fluidity.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Treatment
- treatede0
- Outcome
- stability and fluidity of chloroplast membranese0
- Direction
- better maintainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stability and fluidity of chloroplast membranes were also better maintained in the treated broccoli”
Claim · model-written summary
MEL increased phosphatidylglycerol, monogalactosyldiglyceride and digalactosyldiglyceride contents.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- melatonint0
- Outcome
- contents of phosphatidylglyceroland (PG), monogalactosyldiglyceride (MGDG), digalactosyldiglyceride (DGDG)e0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the contents of phosphatidylglyceroland (PG), monogalactosyldiglyceride (MGDG), digalactosyldiglyceride (DGDG)”
t0“melatonin delays yellowing in harvested broccoli”
Claim · model-written summary
MEL increased unsaturated fatty acid content.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- melatonint0
- Outcome
- unsaturated fatty acidse0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the contents of phosphatidylglyceroland (PG), monogalactosyldiglyceride (MGDG), digalactosyldiglyceride (DGDG) and unsaturated fatty acids”
t0“melatonin delays yellowing in harvested broccoli”
Claim · model-written summary
MEL decreased saturated fatty acid content.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- melatonint0
- Outcome
- saturated fatty acid contente0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing saturated fatty acid content”
t0“melatonin delays yellowing in harvested broccoli”
Claim · model-written summary
MEL decreased LOX and LPS activities.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- melatonint0
- Outcome
- activities of lipoxygenase (LOX) and lipase (LPS)e0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing saturated fatty acid content and the activities of lipoxygenase (LOX) and lipase (LPS).”
t0“melatonin delays yellowing in harvested broccoli”
Claim · model-written summary
MEL postponed broccoli yellowing and extended storage life.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Treatment
- application of MELe0
- Outcome
- yellowing postponement and the extension of the storage lifee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of MEL facilitated the maintenance of chloroplast integrity, thus contributing to yellowing postponement and the extension of the storage life of broccoli.”
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See all 7 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.