Abstract
The senescence of maize and hydrangea leaves after being detached and kept in the dark was studied in terms of the loss of chlorophyll. Chlorophyll was more rapidly degraded in maize than hydrangea during the incubation period in the dark. The loss of chlorophyll in the dark was effectively inhibited in both plants by α,α′-dipyridyl and o-phenanthroline at concentrations between 0.01 and 0.1 mM. Three other chelators of iron produced lesser inhibition and only at higher concentrations. EDTA prevented the loss of chlorophyll in maize leaves at concentrations above 10 mM, but did not do so in hydrangea leaves. Detached leaves floated on EDTA, α,α′-dipyridyl or o-phenanthroline solutions and exposed to light exhibited a marked bleaching. The bleaching was partially inhibited by applying ascorbic acid.
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Claims 10
Claim · model-written summary
Chlorophyll degraded faster in maize than hydrangea in darkness.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll was more rapidly degraded in maize than hydrangea during the incubation period in the dark”
Claim · model-written summary
Dipyridyl inhibited dark chlorophyll loss in both plants.
- Treatment
- α,α′-dipyridyle0
- Outcome
- loss of chlorophylle0
- Direction
- inhibitede0
- Qualifier
- between 0.01 and 0.1 mMe0
HydrangeaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The loss of chlorophyll in the dark was effectively inhibited in both plants by α,α′-dipyridyl and o-phenanthroline at concentrations between 0.01 and 0.1 mM”
e1“The senescence of maize and hydrangea leaves”
Claim · model-written summary
O-phenanthroline inhibited dark chlorophyll loss in both plants.
- Treatment
- o-phenanthrolinee0
- Outcome
- loss of chlorophylle0
- Direction
- inhibitede0
- Qualifier
- between 0.01 and 0.1 mMe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The loss of chlorophyll in the dark was effectively inhibited in both plants by α,α′-dipyridyl and o-phenanthroline at concentrations between 0.01 and 0.1 mM”
e1“The senescence of maize and hydrangea leaves”
Claim · model-written summary
Three other iron chelators gave weaker inhibition at higher concentrations.
- Treatment
- Three other chelators of irone0
- Outcome
- inhibitione0
- Direction
- lessere0
- Qualifier
- only at higher concentrationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three other chelators of iron produced lesser inhibition and only at higher concentrations”
e1“The senescence of maize and hydrangea leaves”
Claim · model-written summary
EDTA prevented chlorophyll loss in maize above 10 mM.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EDTA prevented the loss of chlorophyll in maize leaves at concentrations above 10 mM”
Claim · model-written summary
EDTA did not prevent chlorophyll loss in hydrangea leaves.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not do so in hydrangea leaves”
e1“EDTA prevented the loss of chlorophyll in maize leaves at concentrations above 10 mM”
Claim · model-written summary
EDTA caused marked bleaching of detached leaves exposed to light.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detached leaves floated on EDTA, α,α′-dipyridyl or o-phenanthroline solutions and exposed to light exhibited a marked bleaching”
e1“The senescence of maize and hydrangea leaves”
Claim · model-written summary
Dipyridyl caused marked bleaching of detached leaves exposed to light.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detached leaves floated on EDTA, α,α′-dipyridyl or o-phenanthroline solutions and exposed to light exhibited a marked bleaching”
e1“The senescence of maize and hydrangea leaves”
Claim · model-written summary
O-phenanthroline caused marked bleaching of detached leaves exposed to light.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detached leaves floated on EDTA, α,α′-dipyridyl or o-phenanthroline solutions and exposed to light exhibited a marked bleaching”
e1“The senescence of maize and hydrangea leaves”
Claim · model-written summary
Ascorbic acid partly inhibited bleaching.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bleaching was partially inhibited by applying ascorbic acid”
e1“The senescence of maize and hydrangea leaves”
The same questions in other papers
ascorbic acid · crop injury · Zea mays (maize)Positive and negative results
1 in the opposite direction
- no effect
ethylenediaminetetraacetic acid · crop injury · Zea mays (maize)Positive and negative results
1 in the opposite direction
- positive
ethylenediaminetetraacetic acid · physiology: pigments · Zea mays (maize)Positive and negative results
1 in the opposite direction
- negative
iron atom · disease · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
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.