Abstract
Effects of pod removal on the photosynthetic rates and their under lying biochemical properties were examined in leaves of bean ( Phaseolus vulgaris L.). Pod removal led to decreases in the photosynthetic gas- exchange rate, stomatal conductance and intercellular CO2 pressure. H owever, these decreases in photosynthesis were not asso-ciated with changes in the amounts of ribulose-1,5-bisphosphate carb oxylase (Rubisco) and other several photo-synthetic components, but were associated with an increase in starch content. In addition, such a decrease in the photosynthetic rate was not observed when measured with O2 evolution under conditions of saturating CO2. Similarly, although a decrease in CO2-limited photosynthesis for a given Rubisco content was found in depodded plants, neither the speci fic activity nor activation state of Rubisco decreased . The decrease in the photosynthetic gas-exchange rate by pod removal was rec overed by shading the plants. CO2-limited photosynthesis per unit of Rubisco protein was also completely recovered at the same l evel in the plants with pods. At the same time, starch accumu-lation was also decreased by shading. From these results, we concluded that the suppression of photosynthesis observed in depodded beans was caused by the hindrance of CO2 diffusion due to starch accumulated in the chloroplast.
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Claims 10
Claim · model-written summary
Pod removal decreased bean gas-exchange photosynthesis, stomatal conductance and intercellular CO2 pressure.
- Taxon
- beant0
- Treatment
- Pod removale0
- Outcome
- photosynthetic gas- exchange rate, stomatal conductance and intercellular CO2 pressuree0
- Direction
- decreasese0
Not reportedComparator
Verbatim
e0“Pod removal led to decreases in the photosynthetic gas- exchange rate, stomatal conductance and intercellular CO2 pressure”
t0“pod-removed bean”
Claim · model-written summary
The photosynthetic decrease was associated with increased starch content.
Verbatim
e0“these decreases in photosynthesis were not asso-ciated with changes in the amounts of ribulose-1,5-bisphosphate carb oxylase (Rubisco) and other several photo-synthetic components, but were associated with an increase in starch content”
t0“pod-removed bean”
Claim · model-written summary
Pod removal did not change Rubisco and other photosynthetic component amounts.
- Taxon
- beant0
- Outcome
- amounts of ribulose-1,5-bisphosphate carb oxylase (Rubisco) and other several photo-synthetic componentse0
- Direction
- not asso-ciated with changese0
Not reportedTreatmentComparator
Verbatim
e0“these decreases in photosynthesis were not asso-ciated with changes in the amounts of ribulose-1,5-bisphosphate carb oxylase (Rubisco) and other several photo-synthetic components”
t0“pod-removed bean”
Claim · model-written summary
Under saturating CO2, pod removal did not decrease photosynthesis measured by O2 evolution.
- Taxon
- beant0
- Outcome
- photosynthetic ratee0
- Direction
- not observede0
- Qualifier
- conditions of saturating CO2e0
Not reportedTreatmentComparator
Verbatim
e0“such a decrease in the photosynthetic rate was not observed when measured with O2 evolution under conditions of saturating CO2”
t0“pod-removed bean”
Claim · model-written summary
Depodded plants showed reduced CO2-limited photosynthesis for a given Rubisco content.
- Taxon
- beant0
- Treatment
- depoddede0
- Outcome
- CO2-limited photosynthesise0
- Direction
- decreasee0
- Qualifier
- for a given Rubisco contente0
Not reportedComparator
Verbatim
e0“a decrease in CO2-limited photosynthesis for a given Rubisco content was found in depodded plants”
t0“pod-removed bean”
Claim · model-written summary
Rubisco specific activity and activation state did not decrease in depodded plants.
Not reportedTreatmentComparator
Verbatim
e0“neither the speci fic activity nor activation state of Rubisco decreased”
t0“pod-removed bean”
Claim · model-written summary
Shading restored the gas-exchange photosynthetic rate in depodded plants.
Not reportedComparator
Verbatim
e0“The decrease in the photosynthetic gas-exchange rate by pod removal was rec overed by shading the plants”
t0“pod-removed bean”
Claim · model-written summary
Shading restored CO2-limited photosynthesis per Rubisco protein to the level of plants with pods.
- Taxon
- beant0
- Outcome
- CO2-limited photosynthesis per unit of Rubisco proteine0
- Direction
- recoverede0
- Comparator
- plants with podse0
Not reportedTreatment
Verbatim
e0“CO2-limited photosynthesis per unit of Rubisco protein was also completely recovered at the same l evel in the plants with pods”
t0“pod-removed bean”
Claim · model-written summary
Shading decreased starch accumulation.
Not reportedComparator
Verbatim
e0“starch accumu-lation was also decreased by shading”
t0“pod-removed bean”
Claim · model-written summary
The authors attributed photosynthetic suppression in depodded beans to hindered CO2 diffusion from chloroplast starch accumulation.
Verbatim
e0“the suppression of photosynthesis observed in depodded beans was caused by the hindrance of CO2 diffusion due to starch accumulated in the chloroplast”
The same questions in other papers
shade · physiology: photosynthesis · Phaseolus vulgaris (common bean)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
2 papers more in this group
See all 6 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.