Abstract
L-ascorbate (ASC) is essential for human health. Therefore, there is interest in increasing the ASC content of crops like tomato. High irradiance induces accumulation of ASC in green tomato fruits. The D-mannose/L-galactose biosynthetic pathway accounts for the most ASC in plants. The myo-inositol and galacturonate pathways have been proposed to exist but never identified in plants. The D-mannose/L-galactose starts from D-glucose. In a series of experiments, we tested the hypothesis that ASC levels depend on soluble carbohydrate content when tomato fruits ripen under irradiances that stimulate ASC biosynthesis. We show that ASC levels considerably increased when fruits ripened under light, but carbohydrate levels did not show a parallel increase. When carbohydrate levels in fruits were altered by flower pruning, no effects on ASC levels were observed at harvest or after ripening under irradiances that induce ASC accumulation. Artificial feeding of trusses with sucrose increased carbohydrate levels, but did not affect the light-induced ASC levels. We conclude that light-induced accumulation of ASC is independent of the carbohydrate content in tomato fruits. In tomato fruit treated with light, the increase in ASC was preceded by a concomitant increase in myo-inositol.
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Claims 7
Claim · model-written summary
Ascorbate increased considerably when tomato fruits ripened under light.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- lighte0
- Outcome
- ASC levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ASC levels considerably increased when fruits ripened under light”
t0“Tomato Fruits”
Claim · model-written summary
Carbohydrate levels did not increase in parallel with ascorbate under light.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- carbohydrate levelse0
- Direction
- did not show a parallel increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carbohydrate levels did not show a parallel increase”
t0“Tomato Fruits”
Claim · model-written summary
Flower pruning did not affect fruit ascorbate at harvest or after ripening under light.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- flower pruninge0
- Outcome
- ASC levelse0
- Direction
- no effectse0
- Qualifier
- at harvest or after ripening under irradiances that induce ASC accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When carbohydrate levels in fruits were altered by flower pruning, no effects on ASC levels were observed at harvest or after ripening under irradiances that induce ASC accumulation.”
t0“Tomato Fruits”
Claim · model-written summary
Sucrose feeding raised fruit carbohydrate levels.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- feeding of trusses with sucrosee0
- Outcome
- carbohydrate levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Artificial feeding of trusses with sucrose increased carbohydrate levels”
t0“Tomato Fruits”
Claim · model-written summary
Sucrose feeding did not affect light-induced ascorbate levels.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- feeding of trusses with sucrosee0
- Outcome
- light-induced ASC levelse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Artificial feeding of trusses with sucrose increased carbohydrate levels, but did not affect the light-induced ASC levels.”
t0“Tomato Fruits”
Claim · model-written summary
Light-induced ascorbate accumulation was independent of carbohydrate content.
- Taxon
- tomatoSolanum lycopersicume0
- Compound
- carbohydratee0
- Outcome
- accumulation of ASCe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-induced accumulation of ASC is independent of the carbohydrate content in tomato fruits”
Claim · model-written summary
Myo-inositol increased before ascorbate increased in light-treated tomato fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- lighte0
- Outcome
- myo-inositole0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In tomato fruit treated with light, the increase in ASC was preceded by a concomitant increase in myo-inositol.”
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See all 71 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.