Abstract
The photosynthetic capacity of leaves of N-sufficent plants of Spinacia oleracea L. increases following transfer a constant temperature of 10°C for 10 d compared to plants maintained at 25°C. The effects of nitrogen nutrition on this low temperature acclimation have been investigated in respect of CO2 assimilation, the activities and activation states of key enzymes and the partitioning of recently fixed carbon. N-deficiency greatly restricted acclimation of photosynthetic CO2 assimilation to low temperature at both ambient and at saturating CO2 concentrations, indicating a restriction on accilmatory changes in both ribulose1,5-bisphosphate carboxylase-oxygenase (Rubisco) and the reactions of ribulose1,5-bisphosphate regeneration. Nitrogen limitation led to an increase in the partitioning of recently-fixed carbon into starch. Total protein increased during acclimation in both N-sufficient and N-deficient leaves and was much less affected than were the activities of enzymes. Increases in the activation state of Rubisco and the stromal fructose-1,6-bisphosphatase occurred in response to low temperature, but increases in the activities of Rubisco, sucrose-phosphate synthase or the cytosolic fructose1,6-bisphosphatase could not be sustained in N-deficient plants throughout the period of acclimation, although the activities of these enzymes declined less precipitately than in non-acclimated N-deficient plants. These data are all consistent with the view that increases in the activities of key enzymes of carbon assimilation are a pre-requisite for acclimation to low temperature and that these increases are restricted under N-limitation.
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Claims 10
Claim · model-written summary
Photosynthetic capacity increased after transfer to 10°C for 10 days relative to 25°C.
- Taxon
- Spinacia oleracea L.
Spinacia oleraceae0 - Organ / stage
- leavese0
- Treatment
- 10°C for 10 de0
- Outcome
- photosynthetic capacitye0
- Direction
- increasese0
- Comparator
- 25°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic capacity of leaves of N-sufficent plants of Spinacia oleracea L. increases following transfer a constant temperature of 10°C for 10 d compared to plants maintained at 25°C.”
Claim · model-written summary
Nitrogen deficiency greatly restricted acclimation of photosynthetic CO2 assimilation at ambient and saturating CO2.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- N-deficiencye0
- Outcome
- acclimation of photosynthetic CO2 assimilatione0
- Direction
- restrictede0
- Qualifier
- at both ambient and at saturating CO2 concentrationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-deficiency greatly restricted acclimation of photosynthetic CO2 assimilation to low temperature at both ambient and at saturating CO2 concentrations”
t0“Spinacia oleracea L.”
Claim · model-written summary
Nitrogen limitation increased partitioning of recently fixed carbon into starch.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- Nitrogen limitatione0
- Outcome
- partitioning of recently-fixed carbon into starche0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen limitation led to an increase in the partitioning of recently-fixed carbon into starch.”
t0“Spinacia oleracea L.”
Claim · model-written summary
Total protein increased during acclimation in both nitrogen groups.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Organ / stage
- leavese0
- Outcome
- Total proteine0
- Direction
- increasede0
- Qualifier
- both N-sufficient and N-deficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total protein increased during acclimation in both N-sufficient and N-deficient leaves and was much less affected than were the activities of enzymes.”
t0“Spinacia oleracea L.”
Claim · model-written summary
Total protein was less affected than enzyme activities.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Outcome
- Total proteine0
- Direction
- much less affectede0
- Comparator
- activities of enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total protein increased during acclimation in both N-sufficient and N-deficient leaves and was much less affected than were the activities of enzymes.”
t0“Spinacia oleracea L.”
Claim · model-written summary
Low temperature increased Rubisco activation state.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- low temperaturee0
- Gene
- Rubiscoe0
- Outcome
- activation state of Rubiscoe0
- Direction
- Increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in the activation state of Rubisco and the stromal fructose-1,6-bisphosphatase occurred in response to low temperature”
t0“Spinacia oleracea L.”
Claim · model-written summary
Low temperature increased stromal fructose-1,6-bisphosphatase activation state.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- low temperaturee0
- Gene
- stromal fructose-1,6-bisphosphatasee0
- Outcome
- activation state of Rubisco and the stromal fructose-1,6-bisphosphatasee0
- Direction
- Increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in the activation state of Rubisco and the stromal fructose-1,6-bisphosphatase occurred in response to low temperature”
t0“Spinacia oleracea L.”
Claim · model-written summary
Rubisco activity increases could not be sustained under nitrogen deficiency.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- N-deficiente0
- Gene
- Rubiscoe0
- Outcome
- activities of Rubiscoe0
- Direction
- could not be sustainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in the activities of Rubisco, sucrose-phosphate synthase or the cytosolic fructose1,6-bisphosphatase could not be sustained in N-deficient plants throughout the period of acclimation”
t0“Spinacia oleracea L.”
Claim · model-written summary
Sucrose-phosphate synthase activity increases could not be sustained under nitrogen deficiency.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- N-deficiente0
- Gene
- sucrose-phosphate synthasee0
- Outcome
- activities of Rubisco, sucrose-phosphate synthasee0
- Direction
- could not be sustainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in the activities of Rubisco, sucrose-phosphate synthase or the cytosolic fructose1,6-bisphosphatase could not be sustained in N-deficient plants throughout the period of acclimation”
t0“Spinacia oleracea L.”
Claim · model-written summary
Cytosolic fructose1,6-bisphosphatase activity increases could not be sustained under nitrogen deficiency.
- Taxon
- Spinacia oleracea L.Spinacia oleraceat0
- Treatment
- N-deficiente0
- Gene
- cytosolic fructose1,6-bisphosphatasee0
- Outcome
- activities of Rubisco, sucrose-phosphate synthase or the cytosolic fructose1,6-bisphosphatasee0
- Direction
- could not be sustainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in the activities of Rubisco, sucrose-phosphate synthase or the cytosolic fructose1,6-bisphosphatase could not be sustained in N-deficient plants throughout the period of acclimation”
t0“Spinacia oleracea L.”
The same questions in other papers
nitrogen · physiology: photosynthesis · Spinacia oleracea (spinach)Positive and negative results
5 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- no effect
- negative
7 papers more in this group
See all 11 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.