Abstract
Using inorganic nitrogen-limited (N-Lim) spinach and soybean plants that accumulate elevated foliar levels of free glucose, sucrose, and starch, we determined the influence of carbohydrate level upon total leaf vitamin C (ascorbate + dehydroascorbate) level and on the redox ratio of ascorbate (ASC) to dehydroascorbate (DHA). In the light, the levels of free glucose and glucose sources, including sucrose and starch, were usually considerably higher in the leaves of inorganic nitrogen-limited spinach and soybean plants than in the leaves of N-sufficient (N-Suff) control plants. However, in the light, leaves of N-Suff plants often had as much or more total vitamin C than leaves of N-Lim plants. There was never a consistent relationship between elevated glucose or other elevated carbohydrate levels and an elevated level of vitamin C. In contrast, the leaves of both N-Lim spinach and soybean plants displayed considerably higher ratios of ASC to DHA in the light periods than did leaves of N-Suff plants. This suggested that in leaves of N-Lim spinach and soybean plants, the elevated levels of foliar glucose and other glucose sources caused the increased availability of reductant that, in turn, supported a more rapid reduction of DHA to ASC.
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Claims 5
Claim · model-written summary
In the light, nitrogen-limited spinach and soybean leaves usually had considerably higher free glucose levels than N-sufficient control plants.
- Taxon
- spinach and soybean
Spinacia oleracea
Glycine maxe0 - Treatment
- inorganic nitrogen-limitede3
- Compound
- glucosee3
- Outcome
- levels of free glucosee3
- Direction
- highere3
- Qualifier
- usually considerablye3
- Comparator
- N-sufficient (N-Suff) control plantse3
- Setting
- In the lighte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inorganic nitrogen-limited (N-Lim) spinach and soybean plants”
e3“In the light, the levels of free glucose and glucose sources, including sucrose and starch, were usually considerably higher in the leaves of inorganic nitrogen-limited spinach and soybean plants than in the leaves of N-sufficient (N-Suff) control plants”
Claim · model-written summary
There was no consistent relationship between elevated glucose or other carbohydrate levels and elevated vitamin C.
- Taxon
- spinach and soybeanSpinacia oleraceaGlycine maxe0
- Compound
- glucosee1
- Outcome
- level of vitamin Ce1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inorganic nitrogen-limited (N-Lim) spinach and soybean plants”
e1“There was never a consistent relationship between elevated glucose or other elevated carbohydrate levels and an elevated level of vitamin C”
Claim · model-written summary
Nitrogen-limited spinach and soybean leaves displayed considerably higher ratios of ASC to DHA in the light periods than N-sufficient plants.
- Taxon
- spinach and soybeanSpinacia oleraceaGlycine maxe0
- Treatment
- N-Lime4
- Outcome
- ratios of ASC to DHAe4
- Direction
- highere4
- Comparator
- N-Suff plantse4
- Setting
- in the light periodse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inorganic nitrogen-limited (N-Lim) spinach and soybean plants”
e4“the leaves of both N-Lim spinach and soybean plants displayed considerably higher ratios of ASC to DHA in the light periods than did leaves of N-Suff plants”
Claim · model-written summary
N-Suff plants often had as much or more total vitamin C than N-Lim plants in the light.
- Taxon
- spinach and soybeanSpinacia oleraceaGlycine maxe0
- Treatment
- N-Lime2
- Outcome
- total vitamin Ce2
- Direction
- as much or moree2
- Qualifier
- oftene2
- Comparator
- N-Suff plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inorganic nitrogen-limited (N-Lim) spinach and soybean plants”
e2“in the light, leaves of N-Suff plants often had as much or more total vitamin C than leaves of N-Lim plants”
Claim · model-written summary
Elevated foliar glucose in nitrogen-limited spinach and soybean may increase reductant availability and speed the reduction of DHA to ASC.
- Taxon
- spinach and soybeanSpinacia oleraceaGlycine maxe5
- Compound
- glucosee5
- Outcome
- reduction of DHA to ASCe5
- Qualifier
- increased availability of reductante5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“This suggested that in leaves of N-Lim spinach and soybean plants, the elevated levels of foliar glucose and other glucose sources caused the increased availability of reductant that, in turn, supported a more rapid reduction of DHA to ASC”
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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.