Abstract
The effects were examined of 5-aminolevulinic acid (ALA) on the accumulation of Chl and apoproteins of light-harvesting Chl a/b-protein complex of photosystem II (LHCII) in cucumber cotyledons under intermittent light. A supply of ALA preferentially increased the accumulation of Chl a during intermittent illumination. However, when cotyledons were pretreated with a brief exposure to light or benzyladenine (BA), the stimulatory effect of ALA on the increase in the level of Chl b was greater than that in the level of Chl a, resulting in decreased ratios of Chl a/b. Time-course experiments with preilluminated cotyledons revealed that LHCII apoproteins accumulated rapidly within the first 30 min of intermittent illumination with a decline during subsequent incubation in darkness. A supply of ALA did not affect the accumulation of LHCII apoproteins during the intermittent light period, but it efficiently inhibited the decline in their levels during the subsequent darkness. After exposure to a single pulse of light of BA-treated cotyledons, the prompt increase in levels of LHCII apoproteins was not accompanied by the formation of Ch b, which began to accumulate later. The pattern of changes in levels of LHCII apoproteins was quite similar to that in levels of Chl a. These results suggest that LHCII apoproteins are first stabilized by binding with Chl a and that an increased supply of Chl a and the accumulation of LHCII apoproteins are prerequisites for the formation of Chl b.
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Claims 11
Claim · model-written summary
A supply of ALA increased Chl a accumulation in cucumber cotyledons under intermittent illumination.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- cotyledonse0
- Treatment
- A supply of ALAe1
- Outcome
- accumulation of Chl ae1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e1“A supply of ALA preferentially increased the accumulation of Chl a during intermittent illumination”
Claim · model-written summary
ALA decreased Chl a/b ratios in pretreated cucumber cotyledons.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- cotyledonse0
- Treatment
- ALAe2
- Outcome
- ratios of Chl a/be2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e2“when cotyledons were pretreated with a brief exposure to light or benzyladenine (BA), the stimulatory effect of ALA on the increase in the level of Chl b was greater than that in the level of Chl a, resulting in decreased ratios of Chl a/b”
Claim · model-written summary
ALA increased Chl b more than Chl a in pretreated cucumber cotyledons.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- ALAe2
- Outcome
- the increase in the level of Chl be2
- Direction
- greatere2
- Comparator
- the level of Chl ae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e2“when cotyledons were pretreated with a brief exposure to light or benzyladenine (BA), the stimulatory effect of ALA on the increase in the level of Chl b was greater than that in the level of Chl a, resulting in decreased ratios of Chl a/b”
Claim · model-written summary
LHCII apoproteins accumulated rapidly in the first 30 min of intermittent illumination in cucumber cotyledons.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- LHCII apoproteinse3
- Qualifier
- accumulated rapidly within the first 30 min of intermittent illuminatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e3“LHCII apoproteins accumulated rapidly within the first 30 min of intermittent illumination with a decline during subsequent incubation in darkness”
Claim · model-written summary
LHCII apoproteins declined during subsequent incubation in darkness.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- LHCII apoproteinse3
- Direction
- declinee3
- Qualifier
- during subsequent incubation in darknesse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e3“LHCII apoproteins accumulated rapidly within the first 30 min of intermittent illumination with a decline during subsequent incubation in darkness”
Claim · model-written summary
ALA did not change LHCII apoprotein accumulation during intermittent light.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- A supply of ALAe4
- Outcome
- accumulation of LHCII apoproteinse4
- Direction
- no_changeinferrede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e4“A supply of ALA did not affect the accumulation of LHCII apoproteins during the intermittent light period, but it efficiently inhibited the decline in their levels during the subsequent darkness”
Claim · model-written summary
ALA inhibited the decline of LHCII apoprotein levels during subsequent darkness.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- A supply of ALAe4
- Outcome
- decline in their levelse4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e4“A supply of ALA did not affect the accumulation of LHCII apoproteins during the intermittent light period, but it efficiently inhibited the decline in their levels during the subsequent darkness”
Claim · model-written summary
The prompt increase in LHCII apoprotein levels after a single light pulse in BA-treated cotyledons.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- levels of LHCII apoproteinse5
- Direction
- increasee5
- Qualifier
- prompte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e5“the prompt increase in levels of LHCII apoproteins was not accompanied by the formation of Ch b, which began to accumulate later”
Claim · model-written summary
Chl b formation did not accompany the prompt LHCII apoprotein increase and began to accumulate later.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- formation of Ch be5
- Qualifier
- which began to accumulate latere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e5“the prompt increase in levels of LHCII apoproteins was not accompanied by the formation of Ch b, which began to accumulate later”
Claim · model-written summary
LHCII apoprotein level changes in cucumber cotyledons were quite similar to Chl a level changes.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- pattern of changes in levels of LHCII apoproteinse6
- Comparator
- levels of Chl ae6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e6“The pattern of changes in levels of LHCII apoproteins was quite similar to that in levels of Chl a”
Claim · model-written summary
LHCII apoproteins stabilized by Chl a binding and their accumulation with Chl a supply are prerequisites for Chl b formation.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- formation of Chl be7
- Qualifier
- LHCII apoproteins are first stabilized by binding with Chl ae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cucumber cotyledons under intermittent light”
e7“LHCII apoproteins are first stabilized by binding with Chl a and that an increased supply of Chl a and the accumulation of LHCII apoproteins are prerequisites for the formation of Chl b”
The same questions in other papers
5-aminolevulinic acid · molecular: metabolites · Cucumis sativus (cucumber)Results differ
2 in the opposite direction
- 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.