Abstract
Disks of sugar beet leaf that had assimilated C 14 O 2 in light for 10 to 30 seconds were exposed to C 12 O 2 in light or darkness, or in combinations of both for periods of 4 to 25 minutes. The changes in distribution of C 14 among the compounds soluble in 80% ethanol were examined as a function of time for each "flush" treatment. In light, most of the C 14 ultimately accumulates in sucrose, while phosphoglycerate, phosphoenolpyruvate, sugar phosphates, glycine, and serine have more transitory roles. In dark, sucrose is formed much more slowly than in light while alanine becomes the main repository of C 14 . In light following darkness, the accumulation of C 14 in alanine is reversed in favor of its accumulation in sucrose, with the sugar phosphates acting as intermediates. In dark following light, the converse does not occur; sugar phosphates and alanine lose, rather than gain, C 14 , and sucrose shows little tendency to be metabolized. It is suggested that one of the factors directing the course of these interconversions is the level of light-produced phosphate bond energy needed for sucrose synthesis.
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Claims 7
Claim · model-written summary
In light, most labeled carbon ultimately accumulated in sucrose, while several other metabolites had transitory roles.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- lighte0
- Outcome
- C 14 ultimately accumulates in sucrosee0
- Direction
- accumulatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In light, most of the C 14 ultimately accumulates in sucrose, while phosphoglycerate, phosphoenolpyruvate, sugar phosphates, glycine, and serine have more transitory roles.”
t0“SUGAR BEET LEAF”
Claim · model-written summary
In darkness, sucrose formed much more slowly than in light.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- darke0
- Outcome
- sucrose is formede0
- Direction
- more slowlye0
- Comparator
- lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dark, sucrose is formed much more slowly than in light while alanine becomes the main repository of C 14 .”
t0“SUGAR BEET LEAF”
Claim · model-written summary
In darkness, alanine became the principal repository of labeled carbon.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- alanine becomes the main repository of C 14e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dark, sucrose is formed much more slowly than in light while alanine becomes the main repository of C 14 .”
t0“SUGAR BEET LEAF”
Claim · model-written summary
Light after darkness reversed alanine labeling in favor of sucrose, with sugar phosphates intermediate.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- light following darknesse0
- Outcome
- accumulation of C 14 in alaninee0
- Direction
- reversede0
- Qualifier
- sugar phosphates acting as intermediatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In light following darkness, the accumulation of C 14 in alanine is reversed in favor of its accumulation in sucrose, with the sugar phosphates acting as intermediates.”
t0“SUGAR BEET LEAF”
Claim · model-written summary
In darkness after light, sugar phosphates and alanine lost labeled carbon.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- dark following lighte0
- Outcome
- sugar phosphates and alaninee0
- Direction
- losee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dark following light, the converse does not occur; sugar phosphates and alanine lose, rather than gain, C 14 , and sucrose shows little tendency to be metabolized.”
t0“SUGAR BEET LEAF”
Claim · model-written summary
In darkness after light, sucrose showed little tendency to be metabolized.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- sucrose shows little tendency to be metabolizede0
- Direction
- little tendencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dark following light, the converse does not occur; sugar phosphates and alanine lose, rather than gain, C 14 , and sucrose shows little tendency to be metabolized.”
t0“SUGAR BEET LEAF”
Claim · model-written summary
The authors suggest that light-produced phosphate bond energy helps direct these interconversions.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- course of these interconversionse0
- Qualifier
- level of light-produced phosphate bond energye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that one of the factors directing the course of these interconversions is the level of light-produced phosphate bond energy needed for sucrose synthesis.”
t0“SUGAR BEET LEAF”
The same questions in other papers
light · molecular: metabolites · Beta vulgaris (beet)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
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.