Abstract
When 14CO2 was supplied as a 30-s pulse to photosynthesizing apricot leaves, the pattern of the various phosphate esters, organic acids and amino acids was consistent with the operation of the normal C3 photosynthetic pathway. Fructose 6-phosphate became labelled much more rapidly than glucose 6-phosphate and fructose was more rapidly labelled than glucose. Sorbitol was the major end-product of photosynthesis, becoming the predominant 14C-containing compound within 10 min of starting the 14CO2 pulse, and containing more than half the total radioactivity after 30 min. Sorbitol may be synthesized by way of fructose or fructose 6-phosphate rather than glucose or glucose 6-phosphate. Sorbitol phosphate was shown to be present in the tissue as 2% of the total hexose monophosphate, and to become labelled as rapidly as the hexose monophosphates. The pathway of sorbitol synthesis may therefore follow the sequence: fructose 6-phosphate → sorbitol phosphate → sorbitol.
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Claims 10
Claim · model-written summary
Carbon labeling was consistent with the normal C3 photosynthetic pathway.
- Outcome
- normal C3 photosynthetic pathwaye0
Not reportedTaxon
Verbatim
e0“the pattern of the various phosphate esters, organic acids and amino acids was consistent with the operation of the normal C3 photosynthetic pathway”
Claim · model-written summary
Fructose 6-phosphate labeled faster than glucose 6-phosphate.
Not reportedTaxon
Verbatim
e0“Fructose 6-phosphate became labelled much more rapidly than glucose 6-phosphate”
Claim · model-written summary
Fructose labeled faster than glucose.
Not reportedTaxon
Verbatim
e0“fructose was more rapidly labelled than glucose”
Claim · model-written summary
Sorbitol was the major photosynthetic end product.
- Outcome
- major end-product of photosynthesise0
Not reportedTaxon
Verbatim
e0“Sorbitol was the major end-product of photosynthesis”
Claim · model-written summary
Sorbitol became the predominant labeled compound within 10 minutes.
Not reportedTaxon
Verbatim
e0“becoming the predominant 14C-containing compound within 10 min of starting the 14CO2 pulse”
Claim · model-written summary
Sorbitol held over half the radioactivity after 30 minutes.
Not reportedTaxon
Verbatim
e0“containing more than half the total radioactivity after 30 min”
Claim · model-written summary
Sorbitol may be synthesized through fructose or fructose 6-phosphate rather than glucose routes.
- Compound
- fructose or fructose 6-phosphatee0
- Outcome
- Sorbitole0
- Qualifier
- rather than glucose or glucose 6-phosphatee0
Not reportedTaxon
Verbatim
e0“Sorbitol may be synthesized by way of fructose or fructose 6-phosphate rather than glucose or glucose 6-phosphate”
Claim · model-written summary
Sorbitol phosphate represented 2% of total hexose monophosphate.
Not reportedTaxon
Verbatim
e0“Sorbitol phosphate was shown to be present in the tissue as 2% of the total hexose monophosphate”
Claim · model-written summary
Sorbitol phosphate labeled as fast as the hexose monophosphates.
Not reportedTaxonOutcome
Verbatim
e0“to become labelled as rapidly as the hexose monophosphates”
Claim · model-written summary
The proposed sorbitol pathway proceeds from fructose 6-phosphate through sorbitol phosphate to sorbitol.
- Compound
- fructose 6-phosphate → sorbitol phosphatee0
- Outcome
- sorbitole0
- Qualifier
- fructose 6-phosphate → sorbitol phosphate → sorbitole0
Not reportedTaxon
Verbatim
e0“fructose 6-phosphate → sorbitol phosphate → sorbitol”