Abstract
Kinetin and a, á-dipyridyl prevented the rapid decrease of chlorophyll content in detached oat leaves senescing in the dark. In the light, detachment caused a 27–40% rise in peroxidase activity and kinetin enhanced the enzyme in the segments by about 80%. Darkness prevented any detachment-induced rise of the activity and decreased the stimulating action of kinetin and mechanical injury. The effect of dipyridyl on peroxidase activity in the dark was similar to that of kinetin. Kinetin enhanced the same distinctive isoperoxidases under light and dark conditions. Neither horseradish peroxidase nor that extracted from oat leaves showed any ability to hydroxylate free proline in vitro. A system which supposedly led to peroxidase-catalysed proline hydroxylation yielded small amounts of hydroxyproline in the absence of the enzyme. Staining with Fast Blue BB salt in the presence of IAA as a substrate after electrophoresis indicated that all detected oat isoperoxidases had an IAA oxidase activity visually paralleling their peroxidase activity. Crude extracts contained IAA oxidase inhibitors that could be partially or fully removed by dialysis. The possible significance of the rise in peroxidase activity during senescence is discussed.
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Claims 11
Claim · model-written summary
Kinetin prevented chlorophyll loss in detached oat leaves senescing in darkness.
- Taxon
- oat
Avena sativae0 - Treatment
- Kinetine0
- Outcome
- chlorophyll contente0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin and a, á-dipyridyl prevented the rapid decrease of chlorophyll content in detached oat leaves senescing in the dark.”
Claim · model-written summary
Dipyridyl prevented chlorophyll loss in detached oat leaves senescing in darkness.
- Taxon
- oatAvena sativae0
- Treatment
- a, á-dipyridyle0
- Outcome
- chlorophyll contente0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin and a, á-dipyridyl prevented the rapid decrease of chlorophyll content in detached oat leaves senescing in the dark.”
Claim · model-written summary
In light, detachment raised peroxidase activity by 27–40%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the light, detachment caused a 27–40% rise in peroxidase activity”
e7“detached oat leaves senescing in the dark.”
Claim · model-written summary
In light, kinetin enhanced peroxidase activity by about 80%.
- Taxon
- oatAvena sativae7
- Treatment
- kinetine0
- Outcome
- peroxidase activitye1
- Direction
- enhancede0
- Value
- about 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kinetin enhanced the enzyme in the segments by about 80%.”
e1“peroxidase activity and kinetin enhanced the enzyme in the segments by about 80%.”
e7“detached oat leaves senescing in the dark.”
Claim · model-written summary
Darkness prevented the detachment-related rise in peroxidase and reduced stimulation by kinetin and injury.
- Taxon
- oatAvena sativae7
- Outcome
- activitye0
- Setting
- Darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Darkness prevented any detachment-induced rise of the activity and decreased the stimulating action of kinetin and mechanical injury.”
e7“detached oat leaves senescing in the dark.”
Claim · model-written summary
Dipyridyl affected dark peroxidase activity similarly to kinetin.
- Taxon
- oatAvena sativae7
- Treatment
- dipyridyle0
- Outcome
- peroxidase activitye0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of dipyridyl on peroxidase activity in the dark was similar to that of kinetin.”
e7“detached oat leaves senescing in the dark.”
Claim · model-written summary
Kinetin enhanced the same distinctive isoperoxidases in light and dark.
- Taxon
- oatAvena sativae7
- Treatment
- Kinetine0
- Outcome
- isoperoxidasese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin enhanced the same distinctive isoperoxidases under light and dark conditions.”
e7“detached oat leaves senescing in the dark.”
Claim · model-written summary
Neither horseradish nor oat peroxidase hydroxylated free proline in vitro.
- Taxon
- oatAvena sativae0
- Outcome
- hydroxylate free prolinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither horseradish peroxidase nor that extracted from oat leaves showed any ability to hydroxylate free proline in vitro.”
Claim · model-written summary
The putative peroxidase-catalyzed system produced some hydroxyproline without enzyme.
- Taxon
- oatAvena sativae7
- Outcome
- hydroxyprolinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A system which supposedly led to peroxidase-catalysed proline hydroxylation yielded small amounts of hydroxyproline in the absence of the enzyme.”
e7“detached oat leaves senescing in the dark.”
Claim · model-written summary
All detected oat isoperoxidases had IAA oxidase activity paralleling peroxidase activity.
- Taxon
- oatAvena sativae0
- Outcome
- IAA oxidase activitye0
- Direction
- parallelinge0
- Comparator
- peroxidase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all detected oat isoperoxidases had an IAA oxidase activity visually paralleling their peroxidase activity.”
Claim · model-written summary
Crude extracts contained IAA oxidase inhibitors removable by dialysis.
- Taxon
- oatAvena sativae7
- Treatment
- dialysise0
- Outcome
- IAA oxidase inhibitorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crude extracts contained IAA oxidase inhibitors that could be partially or fully removed by dialysis.”
e7“detached oat leaves senescing in the dark.”
The same questions in other papers
kinetin · physiology: pigments · Avena sativa (oats)Results agree
2 papers in the same direction as this paper
- positive
- 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.