Abstract
The inhibition of photosynthesis by reduced sink demand or low rates of end product synthesis was investigated by supplying detached wheat (Triticum aestivum L. cv. Tauro) leaves with 50 mM sucrose, 50 mM glycerol or water through the transpiration stream for 2 h, either at 23 or 12 °C. Lowering the temperature and sucrose and glycerol feeding decreased photosynthetic oxygen evolution at high irradiance and saturating CO2. The decrease in temperature reduced the pools of sucrose and starch, and the ratio glucose 6-phosphate (G6P)/fructose 6-phosphate (F6P), while it increased the concentrations of G6P and F6P (hexose phosphates). Sucrose feeding, in contrast to glycerol feeding, increased sucrose, glucose and fructose contents and the G6P/F6P ratio. Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio; they also tended to increase the ribulose 1,5-bisphosphate (RuBP) content and the RuBP/PGA ratio. Sucrose and glycerol feeding at 12 °C and the decrease in temperature of leaves incubated in these solutions decreased TP and RuBP contents and the TP/PGA and RuBP/PGA ratios. The results suggest that the phosphate limitation caused by accumulation of end products, restriction of their synthesis and sequestration of cytosolic phosphate can inhibit photosynthesis through decreased carboxylation of RuBP or, with increased phosphate limitation, through lowered supply of ATP.
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Claims 17
Claim · model-written summary
Lowering the temperature decreased photosynthetic oxygen evolution in wheat leaves at high irradiance and saturating CO2.
- Taxon
- wheat
Triticum aestivumt0 - Material
- Triticum aestivum L. cv. Tauroe0
- Treatment
- Lowering the temperaturee1
- Outcome
- photosynthetic oxygen evolutione1
- Direction
- decreasede1
- Qualifier
- at high irradiance and saturating CO2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e0“detached wheat (Triticum aestivum L. cv. Tauro) leaves with 50 mM sucrose, 50 mM glycerol or water through the transpiration stream for 2 h”
e1“Lowering the temperature and sucrose and glycerol feeding decreased photosynthetic oxygen evolution at high irradiance and saturating CO2”
Claim · model-written summary
Sucrose feeding at 50 mM decreased photosynthetic oxygen evolution compared with water at high irradiance and saturating CO2.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 50 mM sucrosee0
- Outcome
- photosynthetic oxygen evolutione1
- Direction
- decreasede1
- Qualifier
- at high irradiance and saturating CO2e1
- Comparator
- watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e0“detached wheat (Triticum aestivum L. cv. Tauro) leaves with 50 mM sucrose, 50 mM glycerol or water through the transpiration stream for 2 h”
e1“Lowering the temperature and sucrose and glycerol feeding decreased photosynthetic oxygen evolution at high irradiance and saturating CO2”
Claim · model-written summary
Glycerol feeding at 50 mM decreased photosynthetic oxygen evolution compared with water at high irradiance and saturating CO2.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 50 mM glycerole0
- Outcome
- photosynthetic oxygen evolutione1
- Direction
- decreasede1
- Qualifier
- at high irradiance and saturating CO2e1
- Comparator
- watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e0“detached wheat (Triticum aestivum L. cv. Tauro) leaves with 50 mM sucrose, 50 mM glycerol or water through the transpiration stream for 2 h”
e1“Lowering the temperature and sucrose and glycerol feeding decreased photosynthetic oxygen evolution at high irradiance and saturating CO2”
Claim · model-written summary
The decrease in temperature reduced the pools of sucrose and starch and the G6P/F6P ratio in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- The decrease in temperaturee2
- Outcome
- pools of sucrose and starch, and the ratio glucose 6-phosphate (G6P)/fructose 6-phosphate (F6P)e2
- Direction
- reducede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e2“The decrease in temperature reduced the pools of sucrose and starch, and the ratio glucose 6-phosphate (G6P)/fructose 6-phosphate (F6P), while it increased the concentrations of G6P and F6P (hexose phosphates)”
Claim · model-written summary
The decrease in temperature increased the concentrations of G6P and F6P in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- The decrease in temperaturee2
- Outcome
- concentrations of G6P and F6Pe2
- Direction
- increasede2
- Qualifier
- hexose phosphatese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e2“The decrease in temperature reduced the pools of sucrose and starch, and the ratio glucose 6-phosphate (G6P)/fructose 6-phosphate (F6P), while it increased the concentrations of G6P and F6P (hexose phosphates)”
Claim · model-written summary
Sucrose feeding compared with glycerol feeding increased sucrose, glucose and fructose contents in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose feedinge3
- Outcome
- sucrose, glucose and fructose contentse3
- Direction
- increasede3
- Comparator
- glycerol feedinge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e3“Sucrose feeding, in contrast to glycerol feeding, increased sucrose, glucose and fructose contents and the G6P/F6P ratio”
Claim · model-written summary
Sucrose feeding compared with glycerol feeding increased the G6P/F6P ratio in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose feedinge3
- Outcome
- G6P/F6P ratioe3
- Direction
- increasede3
- Comparator
- glycerol feedinge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e3“Sucrose feeding, in contrast to glycerol feeding, increased sucrose, glucose and fructose contents and the G6P/F6P ratio”
Claim · model-written summary
Sucrose and glycerol incubations at 23 °C increased the concentration of triose-phosphates in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose and glycerol incubations at 23 °Ce4
- Outcome
- concentration of triose-phosphatese4
- Direction
- increasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e4“Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio”
Claim · model-written summary
Sucrose and glycerol incubations at 23 °C decreased the glycerate 3-phosphate content in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose and glycerol incubations at 23 °Ce4
- Outcome
- glycerate 3-phosphate (PGA) contente4
- Direction
- decreasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e4“Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio”
Claim · model-written summary
Decreasing the temperature in leaves incubated in water increased the concentration of triose-phosphates in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- decreasing the temperature in leaves incubated in watere4
- Outcome
- concentration of triose-phosphatese4
- Direction
- increasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e4“Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio”
Claim · model-written summary
Decreasing the temperature in leaves incubated in water decreased the glycerate 3-phosphate content in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- decreasing the temperature in leaves incubated in watere4
- Outcome
- glycerate 3-phosphate (PGA) contente4
- Direction
- decreasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e4“Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio”
Claim · model-written summary
Sucrose and glycerol incubations at 23 °C increased the TP/PGA ratio in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose and glycerol incubations at 23 °Ce4
- Outcome
- TP/PGA ratioe4
- Direction
- increasinge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e4“Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio”
Claim · model-written summary
Sucrose and glycerol incubations at 23 °C tended to increase the RuBP content and the RuBP/PGA ratio in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose and glycerol incubations at 23 °Ce4
- Outcome
- the ribulose 1,5-bisphosphate (RuBP) content and the RuBP/PGA ratioe5
- Direction
- tended to increasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e4“Sucrose and glycerol incubations at 23 °C, as well as decreasing the temperature in leaves incubated in water, increased the concentration of triose-phosphates (glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, TP) and decreased the glycerate 3-phosphate (PGA) content, thus increasing the TP/PGA ratio”
e5“they also tended to increase the ribulose 1,5-bisphosphate (RuBP) content and the RuBP/PGA ratio”
Claim · model-written summary
Sucrose and glycerol feeding at 12 °C decreased the TP and RuBP contents in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose and glycerol feeding at 12 °Ce6
- Outcome
- TP and RuBP contentse6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e6“Sucrose and glycerol feeding at 12 °C and the decrease in temperature of leaves incubated in these solutions decreased TP and RuBP contents and the TP/PGA and RuBP/PGA ratios”
Claim · model-written summary
Sucrose and glycerol feeding at 12 °C decreased the TP/PGA and RuBP/PGA ratios in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Sucrose and glycerol feeding at 12 °Ce6
- Outcome
- TP/PGA and RuBP/PGA ratiose6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e6“Sucrose and glycerol feeding at 12 °C and the decrease in temperature of leaves incubated in these solutions decreased TP and RuBP contents and the TP/PGA and RuBP/PGA ratios”
Claim · model-written summary
The decrease in temperature of leaves incubated in these solutions decreased TP and RuBP contents in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- the decrease in temperature of leaves incubated in these solutionse6
- Outcome
- TP and RuBP contentse6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e6“Sucrose and glycerol feeding at 12 °C and the decrease in temperature of leaves incubated in these solutions decreased TP and RuBP contents and the TP/PGA and RuBP/PGA ratios”
Claim · model-written summary
Phosphate limitation from end-product accumulation and sequestration of cytosolic phosphate is suggested to inhibit photosynthesis in wheat leaves.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- inhibit photosynthesise7
- Qualifier
- phosphate limitation caused by accumulation of end productse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat leaves”
e7“The results suggest that the phosphate limitation caused by accumulation of end products, restriction of their synthesis and sequestration of cytosolic phosphate can inhibit photosynthesis through decreased carboxylation of RuBP or, with increased phosphate limitation, through lowered supply of ATP”
The same questions in other papers
glycerol · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
1 in the opposite direction
- positive
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.