Abstract
S ummary After the transfer of 14‐day old dark‐grown bean seedlings into continuous illumination the etioplasts of the primary leaves develop into chloroplasts in a synchronous manner. Levels of activity in the leaves of most of the enzymes which have been implicated in the photosynthetic carbon cycle have been determined during the first 45 hours of chloroplast development. All of the enzymes investigated were present in etiolated leaves and the activities of most of them increased in response to illumination. One of the early effects of illumination was a rise in the protein content of the leaves, the level of which continued to rise throughout the 45 hours of illumination. Increases in the activity of some of the enzymes, notably phosphoglycerate kinase, fructosediphosphate aldolase, transketolase, NAD‐linked triosephosphate dehydrogenase and triosephosphate isomerase, appeared to begin soon after the commencement of illumination. The onset of light‐induced increases in the activities of ribosephosphate isomerase, phosphori‐bulokinase and ribulosediphosphate carboxylase, showed lag periods of similar duration to the ‘positive’ photoresponse described by Mohr (1966). The longer lag period before an increase of NADP‐Iinked triosephosphate dehydrogenase occurred is consistent with the suggestion of Ziegler and Ziegler (1965) that photosynthetically formed ATP and NADPH may be essential prerequisites for the synthesis of this enzyme. Possible mechanisms of control of the enzyme levels are discussed. The data do not provide any evidence in support of the participation of phosphopyruvate carboxylase, hexosediphosphatase and transaldolase in an important role in connection with the photosynthetic carbon cycle of bean leaves.
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Claims 9
Claim · model-written summary
Etioplasts in bean primary leaves developed synchronously into chloroplasts after illumination.
- Taxon
- beane0
- Organ / stage
- primary leavese0
- Treatment
- continuous illuminatione0
- Outcome
- etioplasts of the primary leaves develop into chloroplasts in a synchronous mannere0
- Comparator
- dark‐growne0
Not reportedDirection
Verbatim
e0“After the transfer of 14‐day old dark‐grown bean seedlings into continuous illumination the etioplasts of the primary leaves develop into chloroplasts in a synchronous manner.”
Claim · model-written summary
All investigated enzymes were present in etiolated bean leaves.
Verbatim
e0“All of the enzymes investigated were present in etiolated leaves”
t0“BEAN LEAVES”
Claim · model-written summary
Most investigated enzyme activities increased after illumination.
Not reportedComparator
Verbatim
e0“the activities of most of them increased in response to illumination”
t0“BEAN LEAVES”
Claim · model-written summary
Bean leaf protein content rose early and continued rising across 45 hours of illumination.
- Taxon
- BEANt0
- Treatment
- illuminatione0
- Outcome
- protein content of the leavese0
- Direction
- risee0
- Qualifier
- throughout the 45 hours of illuminatione0
Not reportedComparator
Verbatim
e0“a rise in the protein content of the leaves, the level of which continued to rise throughout the 45 hours of illumination”
t0“BEAN LEAVES”
Claim · model-written summary
Activities of phosphoglycerate kinase, fructosediphosphate aldolase, and transketolase began rising soon after illumination began.
- Taxon
- BEANt0
- Treatment
- illuminatione0
- Gene
- phosphoglycerate kinasee0
- Outcome
- activity of some of the enzymese0
- Direction
- Increasese0
Not reportedComparator
Verbatim
e0“Increases in the activity of some of the enzymes, notably phosphoglycerate kinase, fructosediphosphate aldolase, transketolase, NAD‐linked triosephosphate dehydrogenase and triosephosphate isomerase, appeared to begin soon after the commencement of illumination.”
t0“BEAN LEAVES”
Claim · model-written summary
NAD-linked triosephosphate dehydrogenase and triosephosphate isomerase activities began rising soon after illumination.
- Taxon
- BEANt0
- Treatment
- illuminatione0
- Gene
- NAD‐linked triosephosphate dehydrogenasee0
- Outcome
- activity of some of the enzymese0
- Direction
- Increasese0
Not reportedComparator
Verbatim
e0“Increases in the activity of some of the enzymes, notably phosphoglycerate kinase, fructosediphosphate aldolase, transketolase, NAD‐linked triosephosphate dehydrogenase and triosephosphate isomerase, appeared to begin soon after the commencement of illumination.”
t0“BEAN LEAVES”
Claim · model-written summary
Activities of ribosephosphate isomerase, phosphori-bulokinase, and ribulosediphosphate carboxylase rose after similar lag periods.
- Taxon
- BEANt0
- Treatment
- lighte0
- Outcome
- activities of ribosephosphate isomerase, phosphori‐bulokinase and ribulosediphosphate carboxylasee0
- Direction
- increasese0
- Qualifier
- lag periods of similar duratione0
Not reportedComparator
Verbatim
e0“The onset of light‐induced increases in the activities of ribosephosphate isomerase, phosphori‐bulokinase and ribulosediphosphate carboxylase, showed lag periods of similar duration”
t0“BEAN LEAVES”
Claim · model-written summary
NADP-linked triosephosphate dehydrogenase activity rose after a longer lag period.
- Taxon
- BEANt0
- Treatment
- illuminatione1
- Outcome
- NADP‐Iinked triosephosphate dehydrogenasee0
- Direction
- increasee0
- Qualifier
- longer lag periode0
Not reportedComparator
Verbatim
e0“The longer lag period before an increase of NADP‐Iinked triosephosphate dehydrogenase occurred”
e1“45 hours of illumination”
t0“BEAN LEAVES”
Claim · model-written summary
The data did not support an important carbon-cycle role for phosphopyruvate carboxylase, hexosediphosphatase, or transaldolase.
Verbatim
e0“The data do not provide any evidence in support of the participation of phosphopyruvate carboxylase, hexosediphosphatase and transaldolase in an important role in connection with the photosynthetic carbon cycle of bean leaves.”
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See all 15 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.