Abstract
Photosynthesis is an integral part of plant metabolism for the production of carbohydrates, which are in turn used for plant biomass production. Phosphate (P) plays an important role in photosynthesis and the production of carbohydrates; however, it is also one of the most difficult macronutrients for plants to obtain. The effects of P deprivation on photosynthesis and respiration in the model legume Lotus japonicus were studied using gas exchange measurements and the A:Ci model of photosynthesis. Phosphate deprivation decreased plant biomass, overall photosynthetic reactions, photosynthesis:respiration ratio and triose-P utilization. The root:shoot ratio, the hallmark of P deprivation, did not show any significant increase under P deprivation, which is in contrast to the bulk of previous findings. Consistent allocation to both roots and shoots could explain this phenomenon. Direct photosynthetic and respiration measurements did not show any significant decrease under P deprivation, although the effect of P on photosynthesis has been shown to be largely species-specific. The ratio of photosynthesis to respiration, however, showed a marked decrease and therefore was affected by P deprivation. Changes in photosynthesis, respiration and triose-P utilization explain the decrease in plant biomass.
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Claims 9
Claim · model-written summary
Phosphate deprivation decreased plant biomass.
- Taxon
- Lotus japonicus
Lotus japonicust0 - Treatment
- Phosphate deprivatione0
- Outcome
- plant biomasse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate deprivation decreased plant biomass, overall photosynthetic reactions, photosynthesis:respiration ratio and triose-P utilization”
t0“Lotus japonicus”
Claim · model-written summary
Phosphate deprivation decreased overall photosynthetic reactions.
- Taxon
- Lotus japonicusLotus japonicust0
- Treatment
- Phosphate deprivatione0
- Outcome
- overall photosynthetic reactionse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate deprivation decreased plant biomass, overall photosynthetic reactions, photosynthesis:respiration ratio and triose-P utilization”
t0“Lotus japonicus”
Claim · model-written summary
Phosphate deprivation decreased the photosynthesis:respiration ratio.
- Taxon
- Lotus japonicusLotus japonicust0
- Treatment
- Phosphate deprivatione0
- Outcome
- photosynthesis:respiration ratioe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate deprivation decreased plant biomass, overall photosynthetic reactions, photosynthesis:respiration ratio and triose-P utilization”
t0“Lotus japonicus”
Claim · model-written summary
Phosphate deprivation decreased triose-P utilization.
- Taxon
- Lotus japonicusLotus japonicust0
- Treatment
- Phosphate deprivatione0
- Outcome
- triose-P utilizatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate deprivation decreased plant biomass, overall photosynthetic reactions, photosynthesis:respiration ratio and triose-P utilization”
t0“Lotus japonicus”
Claim · model-written summary
The root:shoot ratio showed no significant increase under phosphate deprivation.
- Taxon
- Lotus japonicusLotus japonicust0
- Treatment
- P deprivatione0
- Outcome
- root:shoot ratioe0
- Direction
- did not show any significant increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root:shoot ratio, the hallmark of P deprivation, did not show any significant increase under P deprivation”
t0“Lotus japonicus”
Claim · model-written summary
Direct photosynthetic measurements showed no significant decrease under phosphate deprivation.
- Taxon
- Lotus japonicusLotus japonicust0
- Treatment
- P deprivatione0
- Outcome
- photosynthetice0
- Direction
- did not show any significant decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct photosynthetic and respiration measurements did not show any significant decrease under P deprivation”
t0“Lotus japonicus”
Claim · model-written summary
Direct respiration measurements showed no significant decrease under phosphate deprivation.
- Taxon
- Lotus japonicusLotus japonicust0
- Treatment
- P deprivatione0
- Outcome
- respiratione0
- Direction
- did not show any significant decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Direct photosynthetic and respiration measurements did not show any significant decrease under P deprivation”
t0“Lotus japonicus”
Claim · model-written summary
Consistent allocation to roots and shoots could explain the root:shoot result.
- Taxon
- Lotus japonicusLotus japonicust0
- Outcome
- this phenomenone0
- Qualifier
- Consistent allocation to both roots and shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Consistent allocation to both roots and shoots could explain this phenomenon”
t0“Lotus japonicus”
Claim · model-written summary
Changes in photosynthesis, respiration and triose-P utilization explain the biomass decrease.
- Taxon
- Lotus japonicusLotus japonicust0
- Outcome
- decrease in plant biomasse0
- Qualifier
- Changes in photosynthesis, respiration and triose-P utilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in photosynthesis, respiration and triose-P utilization explain the decrease in plant biomass”
t0“Lotus japonicus”