Abstract
We analyzed the effect of NaCl stress on photorespiration of spinach leaves by calculating the rate of carboxylation/oxygenation of ribulose-1,5-bisphosphate carboxylase/oxygenase, and by measuring the content of amino acids produced through photorespiration. After 20 d of NaCl stress the carboxylation rate was reduced while the oxygenation rate was not affected. The contents of serine, glycine, and alanine increased relevantly. The amount of glutamine also increased after 20 d but the amount of glutamate did not. Hence photorespiration may be stimulated under moderate NaCl stress. A relevant electron transport rate was observed under CO2-free air, which may indicate refixation of photorespiratory CO2. When NaCl accumulation proceeded for more than 20 d, photosynthesis was reduced and the content of photo-respiratory amino acids started to decrease, but the oxygenation rate did not change.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
NaCl stress reduced the carboxylation rate of spinach leaves after 20 days.
- Taxon
- Spinach
Spinacia oleraceat0 - Organ / stage
- Leavest0
- Treatment
- NaCl stresse1
- Outcome
- carboxylation ratee1
- Direction
- reducede1
- Qualifier
- After 20 de1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e1“After 20 d of NaCl stress the carboxylation rate was reduced”
Claim · model-written summary
NaCl stress did not affect the oxygenation rate of spinach leaves.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl stresse1
- Outcome
- oxygenation ratee2
- Direction
- not affectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e1“After 20 d of NaCl stress the carboxylation rate was reduced”
e2“while the oxygenation rate was not affected”
Claim · model-written summary
NaCl stress increased the contents of serine, glycine and alanine in spinach leaves.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl stresse1
- Outcome
- contents of serine, glycine, and alaninee3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e1“After 20 d of NaCl stress the carboxylation rate was reduced”
e3“The contents of serine, glycine, and alanine increased relevantly”
Claim · model-written summary
The amount of glutamine in spinach leaves increased after 20 days of NaCl stress.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl stresse1
- Outcome
- amount of glutaminee4
- Direction
- increasede4
- Qualifier
- after 20 de4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e1“After 20 d of NaCl stress the carboxylation rate was reduced”
e4“The amount of glutamine also increased after 20 d”
Claim · model-written summary
The amount of glutamate in spinach leaves did not increase under NaCl stress.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl stresse1
- Outcome
- amount of glutamatee5
- Direction
- did note5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e1“After 20 d of NaCl stress the carboxylation rate was reduced”
e5“but the amount of glutamate did not”
Claim · model-written summary
Photorespiration may be stimulated in spinach leaves under moderate NaCl stress.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- moderate NaCl stresse6
- Outcome
- photorespiratione6
- Qualifier
- may be stimulatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e6“Hence photorespiration may be stimulated under moderate NaCl stress”
Claim · model-written summary
A relevant electron transport rate was observed in spinach leaves under CO2-free air.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- CO2-free aire7
- Outcome
- electron transport ratee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e7“A relevant electron transport rate was observed under CO2-free air”
Claim · model-written summary
The electron transport under CO2-free air may indicate refixation of photorespiratory CO2 in spinach leaves.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- CO2-free aire7
- Outcome
- refixation of photorespiratory CO2e0
- Qualifier
- may indicatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e7“A relevant electron transport rate was observed under CO2-free air”
e0“which may indicate refixation of photorespiratory CO2”
Claim · model-written summary
When NaCl accumulation continued for more than 20 days, photosynthesis was reduced in spinach leaves.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl accumulatione0
- Outcome
- photosynthesise0
- Direction
- reducede0
- Qualifier
- for more than 20 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e0“When NaCl accumulation proceeded for more than 20 d, photosynthesis was reduced”
Claim · model-written summary
With longer NaCl accumulation, the content of photorespiratory amino acids started to decrease in spinach leaves.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl accumulatione0
- Outcome
- content of photo-respiratory amino acidse1
- Direction
- started to decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e0“When NaCl accumulation proceeded for more than 20 d, photosynthesis was reduced”
e1“the content of photo-respiratory amino acids started to decrease”
Claim · model-written summary
With longer NaCl accumulation, the oxygenation rate of spinach leaves did not change.
- Taxon
- SpinachSpinacia oleraceat0
- Organ / stage
- Leavest0
- Treatment
- NaCl accumulatione0
- Outcome
- oxygenation ratee1
- Direction
- did not changee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Photorespiration Rate in Spinach Leaves Under Moderate NaCl Stress”
e0“When NaCl accumulation proceeded for more than 20 d, photosynthesis was reduced”
e1“but the oxygenation rate did not change”
The same questions in other papers
sodium chloride · molecular: metabolites · Spinacia oleracea (spinach)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
2 papers more in this group
See all 6 papers →sodium chloride · physiology: photosynthesis · Spinacia oleracea (spinach)Results agree
1 paper in the same direction as this paper
- negative
salinity · molecular: metabolites · Spinacia oleracea (spinach)Positive and negative results
3 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- positive
- positive
4 papers more in this group
See all 8 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.