Abstract
Peroxidase activity in isolated thylakoids from degreening canola ( Brassica napus cv. Westar) seeds was demonstrated. The enzyme catalyzes the degradation of thylakoid‐bound pigments in the presence of H 2 O 2 and 2,4‐dichlorophenol. Peroxidase activity is related to degreening, with periods of rapid degreening associated with high enzyme activity. Both de novo synthesis and substrate availability appear to control enzyme activity. Peroxidase is initially inhibited and then stimulated by sublethal freezing. Therefore, inhibition of peroxidase activity following sublethal freezing may be responsible, in part, for a failure of the seed to degreen.
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Claims 8
Claim · model-written summary
Peroxidase activity was demonstrated in thylakoids from degreening canola seeds.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Material
- Westare0
- Organ / stage
- seedse0
- Gene
- Peroxidasee0
- Outcome
- Peroxidase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Peroxidase activity in isolated thylakoids from degreening canola ( Brassica napus cv. Westar) seeds was demonstrated”
Claim · model-written summary
Peroxidase catalyzes degradation of thylakoid pigments in the presence of hydrogen peroxide and 2,4-dichlorophenol.
- Taxon
- canolaBrassica napus var. napust0
- Gene
- enzymee0
- Compound
- H 2 O 2 and 2,4‐dichlorophenole0
- Outcome
- degradation of thylakoid‐bound pigmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enzyme catalyzes the degradation of thylakoid‐bound pigments in the presence of H 2 O 2 and 2,4‐dichlorophenol”
t0“canola”
Claim · model-written summary
Rapid seed degreening is associated with high peroxidase activity.
- Taxon
- canolaBrassica napus var. napust0
- Gene
- enzyme activitye0
- Outcome
- rapid degreeninge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“periods of rapid degreening associated with high enzyme activity”
t0“canola”
Claim · model-written summary
De novo synthesis appears to control peroxidase activity.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- enzyme activitye0
- Qualifier
- de novo synthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both de novo synthesis and substrate availability appear to control enzyme activity”
t0“canola”
Claim · model-written summary
Substrate availability appears to control peroxidase activity.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- enzyme activitye0
- Qualifier
- substrate availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both de novo synthesis and substrate availability appear to control enzyme activity”
t0“canola”
Claim · model-written summary
Sublethal freezing initially inhibits peroxidase activity.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- sublethal freezinge0
- Outcome
- Peroxidasee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxidase is initially inhibited and then stimulated by sublethal freezing”
t0“canola”
Claim · model-written summary
Sublethal freezing subsequently stimulates peroxidase activity.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- sublethal freezinge0
- Outcome
- Peroxidasee0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxidase is initially inhibited and then stimulated by sublethal freezing”
t0“canola”
Claim · model-written summary
Freezing-related inhibition of peroxidase may partly cause failure of seeds to degreen.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- sublethal freezinge0
- Outcome
- failure of the seed to degreene0
- Qualifier
- may be responsible, in parte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of peroxidase activity following sublethal freezing may be responsible, in part, for a failure of the seed to degreen”
t0“canola”
The same questions in other papers
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4 papers in the same direction as this paper
- positive
- positive
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1 paper more in this group
See all 5 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.