Abstract
Tobacco plants were grown in vermiculitein pots with Hoagland's solutions containingfive levels (0, 1/4, 1/2, 1, 2) of phosphate nutri-tion. Photosynthesis was ehhanced when phos-phate level was raised from 0 to 1 P level, butdecreased slightly at 2 P level. Photorespirationchanged in parallel to photosynthesis in the ran-ge of 1/4-2 P levels, but had its highest ratioat 0 phosphate level. The ratio of photores-piration/photosynthesis decreased with an inc-rease of phosphate nutrition. Glycolate formation in tobacco leaves res-ponded to phosphate nutrition as photorespira-tion did. Glycolate oxidase activity was lowerin leaves at 0 level of phosphate nutrition, roseat 1/4 P level and decreased at higher phosphatelevels. The addition of FMN to the assay me-dium greatly enhanced glycolate oxidase acti-vity in phosphate deficient leaves. Infiltrating phosphate solutions of differentconcentrations into tobacco leaf disks showedthat photorespiration was reduced with an inc-rease of phosphate concentration. Basing on the experimental evidences ahypothesis is advanced that photorespirationhas the important function of supplementingphosphate for photosynthesis in the chloroplasts.
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Claims 12
Claim · model-written summary
Tobacco photosynthesis increased as phosphate rose from 0 to 1 P.
- Taxon
- Tobacco
Nicotiana tabacume1 - Treatment
- phos-phate levele0
- Outcome
- Photosynthesise0
- Direction
- ehhancede0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthesis was ehhanced when phos-phate level was raised from 0 to 1 P level”
e1“Tobacco plants”
Claim · model-written summary
Tobacco photosynthesis decreased slightly at 2 P.
- Taxon
- TobaccoNicotiana tabacume2
- Treatment
- 2 P levele0
- Outcome
- Photosynthesise1
- Direction
- decreased slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“butdecreased slightly at 2 P level”
e1“Photosynthesis was ehhanced”
e2“Tobacco plants”
Claim · model-written summary
Photorespiration changed in parallel with photosynthesis across 1/4 to 2 P.
- Taxon
- TobaccoNicotiana tabacume1
- Treatment
- 1/4-2 P levelse0
- Outcome
- Photorespiratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photorespirationchanged in parallel to photosynthesis in the ran-ge of 1/4-2 P levels”
e1“Tobacco plants”
Claim · model-written summary
Photorespiration had its highest ratio at zero phosphate.
- Taxon
- TobaccoNicotiana tabacume2
- Treatment
- 0 phosphate levele0
- Outcome
- Photorespiratione1
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had its highest ratioat 0 phosphate level”
e1“Photorespirationchanged”
e2“Tobacco plants”
Claim · model-written summary
The photorespiration to photosynthesis ratio fell as phosphate nutrition increased.
- Taxon
- TobaccoNicotiana tabacume1
- Treatment
- phosphate nutritione0
- Outcome
- ratio of photores-piration/photosynthesise0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of photores-piration/photosynthesis decreased with an inc-rease of phosphate nutrition”
e1“Tobacco plants”
Claim · model-written summary
Glycolate formation responded to phosphate nutrition in the same way as photorespiration.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- leavese0
- Treatment
- phosphate nutritione0
- Outcome
- Glycolate formatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycolate formation in tobacco leaves res-ponded to phosphate nutrition as photorespira-tion did”
Claim · model-written summary
Glycolate oxidase activity was lower at zero phosphate.
- Taxon
- TobaccoNicotiana tabacume1
- Organ / stage
- leavese0
- Treatment
- 0 level of phosphate nutritione0
- Gene
- Glycolate oxidasee0
- Outcome
- Glycolate oxidase activitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycolate oxidase activity was lowerin leaves at 0 level of phosphate nutrition”
e1“Tobacco plants”
Claim · model-written summary
Glycolate oxidase activity rose at 1/4 P.
- Taxon
- TobaccoNicotiana tabacume2
- Treatment
- 1/4 P levele0
- Outcome
- Glycolate oxidase activitye1
- Direction
- rosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roseat 1/4 P level”
e1“Glycolate oxidase activity”
e2“Tobacco plants”
Claim · model-written summary
Glycolate oxidase activity decreased at higher phosphate levels.
- Taxon
- TobaccoNicotiana tabacume2
- Treatment
- higher phosphatelevelse0
- Outcome
- Glycolate oxidase activitye1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased at higher phosphatelevels”
e1“Glycolate oxidase activity”
e2“Tobacco plants”
Claim · model-written summary
Adding FMN to the assay medium greatly enhanced glycolate oxidase activity in phosphate-deficient leaves.
- Taxon
- TobaccoNicotiana tabacume1
- Organ / stage
- leavese0
- Treatment
- addition of FMNe0
- Outcome
- glycolate oxidase acti-vitye0
- Direction
- greatly enhancede0
- Qualifier
- phosphate deficiente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of FMN to the assay me-dium greatly enhanced glycolate oxidase acti-vity in phosphate deficient leaves”
e1“Tobacco plants”
Claim · model-written summary
Infiltrating phosphate into tobacco leaf disks reduced photorespiration as concentration increased.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- leaf diskse0
- Treatment
- phosphate solutionse0
- Outcome
- photorespiratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infiltrating phosphate solutions of differentconcentrations into tobacco leaf disks showedthat photorespiration was reduced with an inc-rease of phosphate concentration”
Claim · model-written summary
The authors hypothesize that photorespiration supplements chloroplast phosphate for photosynthesis.
- Taxon
- TobaccoNicotiana tabacume1
- Outcome
- photosynthesise0
- Qualifier
- photorespirationhas the important function of supplementingphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ahypothesis is advanced that photorespirationhas the important function of supplementingphosphate for photosynthesis in the chloroplasts”
e1“Tobacco plants”
The same questions in other papers
phosphorus · physiology: enzyme activity · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
phosphorus · physiology: photosynthesis · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.