Search claims · PlantClaims

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

The decrease in acetylene reduction correlated with decreases in photosynthesis and transpiration.

Taxon: SoybeanGlycine maxt0
Outcome: photosynthesis and transpiratione0
Direction: decreasese0
Comparator: the decreasee0

Verbatim

e0
“the decrease was correlated with decreases in photosynthesis and transpiration”
✓ located verbatim in the source · abstract, characters 1187–1265

t0
“Soybean”
✓ located verbatim in the source · title, characters 68–75

Title

Acetylene Reduction (Nitrogen Fixation) and Metabolic Activities of Soybean Having Various Leaf and Nodule Water Potentials

Chi-Ying Huang; John S. Boyer; Larry N. Vanderhoef PLANT PHYSIOLOGY 1975. doi:10.1104/pp.56.2.222

Other claims from this paper (12)

Method / resource The apparatus measured nodule acetylene reduction and shoot gas exchange simultaneously.
Observation Acetylene reduction was linear for at least five hours except initially.
Method / resource Endogenous ethylene did not affect measurements.
Method / resource Repeated acetylene reduction measurements had no apparent aftereffects.
Intervention effect Acetylene reduction was undetectable in flooded soil and at severe desiccation.
Intervention effect Acetylene reduction was undetectable at a soil water potential of -19.5 bars.
Observation Acetylene reduction had a sharp optimum between flooded and severely dry soil.
Intervention effect Removing soil eliminated flooding inhibition.
Mechanism Gas exchange restriction was proposed to explain flooding inhibition above -2 bars.
Association Acetylene reduction decreased with further soil drying.
Observation Dark respiration was inhibited less than the other measured processes.
Mechanism Photosynthesis, transpiration, or direct nodule effects were proposed to account for nitrogen fixation inhibition below -2 bars.

Associationauthor interpretationoriginal resultnegativesimulated

Claim · model-written summary

The authors suggest that factors increasing transpiration without directly affecting photosynthesis decrease photosynthesis through water stress.

Taxon: vascular plante0
Treatment: Factors increasing transpiration without directly affecting photosynthesise1
Outcome: photosynthesise1
Direction: decreasee1
Qualifier: because of the effect on water stresse1

Verbatim

e0
“Total seasonal vascular plant CO_2 uptake ranged from 400—627 g CO_2 m_G ( —2)”
✓ located verbatim in the source · abstract, characters 1191–1269

e1
“Factors increasing transpiration without directly affecting photosynthesis tend to decrease photosynthesis because of the effect on water stress”
✓ located verbatim in the source · abstract, characters 1851–1995

Title

A Model of Stand Photosynthesis for the Wet Meadow Tundra at Barrow, Alaska

Philip C. Miller; Wayne A. Stoner; Larry L. Tieszen Ecology 1976. doi:10.2307/1936428

Other claims from this paper (15)

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

The initial decrease in photosynthesis and increase in upper-surface resistance occur simultaneously without a causal relation.

Taxon: cottonGossypium hirsutume1
Outcome: decrease in photosynthesise0
Qualifier: not causally related but occur simultaneouslye0

Verbatim

e0
“the decrease in photosynthesis and increase in stomatal resistance of the upper surface are not causally related but occur simultaneously”
✓ located verbatim in the source · abstract, characters 747–884

e1
“cotton leaves ( Gossypium hirsutum )”
✓ located verbatim in the source · abstract, characters 93–129

Title

The Relation between Photosynthesis and Stomatal Resistance of Each Leaf Surface in Cotton Leaves

S. NAGARAJAH Physiologia Plantarum 1975. doi:10.1111/j.1399-3054.1975.tb01857.x

Other claims from this paper (10)

Associationobservedoriginal resultmeasured

Claim · model-written summary

The photosynthesis increase was comparable in size to the decrease in dark respiration.

Outcome: dark respiratione0
Direction: decreasee0
Comparator: increasee0

Not reportedTaxon

Verbatim

e0
“The increase was of the same order of magnitude as the decrease noted in dark respiration (Rs).”
✓ located verbatim in the source · abstract, characters 261–356

Title

The decline and recovery of photosynthesis of ponderosa pine seedlings subjected to low, but above freezing temperatures

R. P. Pharis; H. Hellmers; E. Schuurmans Canadian Journal of Botany 1972. doi:10.1139/b72-250

Other claims from this paper (12)

Intervention effect At 11 °C, apparent photosynthesis exceeded that at 23 °C for up to 17 days.
Intervention effect At 3 °C apparent photosynthesis was little affected for the first three days.
Intervention effect At 3 °C apparent photosynthesis declined to about 70% of pretreatment by day 10.
Intervention effect Accounting for dark respiration at 3 °C, actual photosynthesis declined to about 50% by day 10.
Observation Photosynthesis then declined slowly over time.
Observation Rapid recovery after transfer back to 23 °C occurred only after at most one day at low temperature.
Observation After 17 days at 11 °C, apparent photosynthesis returned to pretreatment rates by day 7.
Observation After at least four days at 3 °C, apparent photosynthesis recovery reached 80% by day 7.
Observation After at least four days at 3 °C, apparent photosynthesis recovery reached 90% by day 23.
Observation Dark respiration initially increased after transfer from 3 to 23 °C.
Association Dark respiration later decreased at 23 °C as apparent photosynthesis increased.
Mechanism The authors attribute initial chilling injury to respiratory rather than photosynthetic apparatus.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Relative translocation loss exceeded relative photosynthesis loss at every deficiency level.

Taxon: Sugarcanet0
Outcome: relative decrease in translocatione0
Direction: greatere0
Comparator: relative decrease in photosynthesise0

Verbatim

e0
“At all levels of deficiency, the relative decrease in translocation was greater than the relative decrease in photosynthesis”
✓ located verbatim in the source · abstract, characters 721–845

t0
“Sugarcane”
✓ located verbatim in the source · title, characters 79–88

Title

Effect of Potassium Deficiency upon Translocation of ¹⁴C in Detached Blades of Sugarcane

Constance E. Hartt PLANT PHYSIOLOGY 1970. doi:10.1104/pp.45.2.183

Other claims from this paper (10)

Intervention effect Potassium deprivation decreased basipetal translocation before visible symptoms.
Intervention effect Slight potassium deficiency decreased light translocation.
Intervention effect Slight potassium deficiency did not decrease dark translocation.
Intervention effect Severe potassium deficiency decreased translocation in darkness and light.
Intervention effect Potassium deficiency decreased translocation even where photosynthesis rates did not differ.
Intervention effect Potassium deficiency decreased translocation even without net carbon fixation.
Intervention effect Translocation was affected at potassium levels that did not affect photosynthesis.
Intervention effect Potassium deficiency decreased translocation more than moisture content.
Association Potassium decrease correlated better with translocation decrease than moisture decrease did.
Observation Radiophosphorus indicated disrupted stem phosphorylation under potassium deficiency.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Monuron caused the greatest decrease in apple net photosynthesis.

Taxon: apple treesMalus domesticae1
Material: ‘Golden Delicious’/M 7e1
Treatment: Monurone0
Outcome: Pne0
Direction: greatest decreasee0
Setting: greenhousee1

Not reportedComparator

Verbatim

e0
“Monuron caused the greatest decrease in Pn, followed by atrazine and simazine.”
✓ located verbatim in the source · abstract, characters 215–293

e1
“greenhouse grown ‘Golden Delicious’/M 7 apple trees ( Malus domestica Borkh.)”
✓ located verbatim in the source · abstract, characters 95–172

Title

Effect of Some Soil-applied Herbicides on Net Photosynthesis and Growth of Apple Trees1

Dharam P. Sharma; David C. Ferree; Fred O. Hartman HortScience 1977. doi:10.21273/hortsci.12.2.153

Other claims from this paper (6)

Intervention effect Atrazine decreased apple net photosynthesis, less than monuron.
Intervention effect Simazine decreased apple net photosynthesis, less than atrazine.
Intervention effect Diuron had no effect on apple net photosynthesis.
Intervention effect Monuron decreased the apple plastochron index.
Intervention effect Atrazine decreased the apple plastochron index.
Observation Herbicide effects on apple net photosynthesis appeared by day 10 and persisted through day 40.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

RMV infection decreased net canopy photosynthesis by about 50% at maximum.

Taxon: ryegrassesLoliumt0
Interactor: ryegrass mosaic virusRyegrass mosaic virust0pathogen
Outcome: net canopy photosynthesise0
Direction: decreasee0
Value: about 50%e0

Not reportedTreatmentComparator

Verbatim

e0
“decrease in net canopy photosynthesis (maximum decrease about 50%)”
✓ located verbatim in the source · abstract, characters 431–497

t0
“ryegrass mosaic virus on carbon assimilation and growth of ryegrasses”
✓ located verbatim in the source · title, characters 14–83

Title

The effect of ryegrass mosaic virus on carbon assimilation and growth of ryegrasses

M. B. JONES; A. J. HEARD; JANE WOLEDGE; et al. Annals of Applied Biology 1977. doi:10.1111/j.1744-7348.1977.tb01904.x

Other claims from this paper (4)

Intervention effect RMV infection usually reduced dry matter yield in ryegrass swards.
Intervention effect Dark respiration increased by about 50% at maximum in RMV infected swards.
Intervention effect RMV infection decreased tillering by about 30% at maximum.
Intervention effect RMV infection lowered leaf area index.

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Glyoxylate decreased oxygen sensitivity of photosynthesis.

Taxon: TobaccoNicotiana tabacumt0
Treatment: glyoxylatee0
Outcome: O(2) sensitivity of photosynthesise0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“The decrease in the O(2) sensitivity of photosynthesis in the presence of glyoxylate”
✓ located verbatim in the source · abstract, characters 874–958

t0
“Tobacco”
✓ located verbatim in the source · title, characters 96–103

Title

Effect of Glyoxylate on the Sensitivity of Net Photosynthesis to Oxygen (the Warburg Effect) in Tobacco

David J. Oliver PLANT PHYSIOLOGY 1978. doi:10.1104/pp.62.6.938

Other claims from this paper (10)

Intervention effect Glyoxylate inhibited glycolate synthesis in tobacco leaf discs.
Intervention effect Glyoxylate inhibited photorespiration in tobacco leaf discs.
Intervention effect Glyoxylate increased net photosynthetic carbon dioxide fixation.
Intervention effect Lowering oxygen from 21 to 3% increased control-disc photosynthesis from 59.1 to 94.7 micromoles per gram fresh weight per hour, a 60% increase.
Intervention effect With 15 millimolar glyoxylate, lowering oxygen increased photosynthesis from 82.0 to 99.7 micromoles per gram fresh weight per hour, a 22% increase.
Observation Tobacco leaf discs metabolized added glyoxylate at about 1.35 micromoles per gram fresh weight per hour.
Association Glyoxylate metabolism rate did not depend on atmospheric oxygen concentration.
Observation The glyoxylate metabolism rate was about 10% of the glyoxylate-induced increase in carbon dioxide fixation on a molar carbon basis.
Intervention effect Ten millimolar glyoxylate had no effect on the isolated carboxylase/oxygenase activity.
Mechanism The authors conclude that cellular metabolites can regulate the Warburg effect.

Associationobservedoriginal resultmeasured

Claim · model-written summary

Photosynthesis declined more rapidly at higher transpiration rates.

Taxon: BEAN PLANTSt0
Outcome: decrease in photosynthesise0
Direction: more rapide0
Comparator: higher transpiration ratese0

Verbatim

e0
“The decrease in photosynthesis was more rapid at higher transpiration rates.”
✓ located verbatim in the source · abstract, characters 431–507

t0
“BEAN PLANTS”
✓ located verbatim in the source · title, characters 32–43

Title

EFFECT OF TRANSPIRATION RATE OF BEAN PLANTS ON INHIBITION OF PHOTOSYNTHESIS BY SOME ROOT‐APPLIED HERBICIDES

J. L. P. van OORSCHOT Weed Research 1970. doi:10.1111/j.1365-3180.1970.tb00947.x

Other claims from this paper (3)

Association Total transpiration to 50% inhibition was almost constant across transpiration rates.
Intervention effect Lenacil caused less photosynthesis inhibition than other herbicides.
Intervention effect Diuron caused less photosynthesis inhibition than other herbicides.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

The authors suggest stomatal closure partly explains reduced photosynthesis at low temperature.

Taxon: Ulmus americana and Fraxinus pennsylvanicaUlmus americanaFraxinus pennsylvanicat0
Outcome: decrease in photosynthesise0
Direction: decreasee0
Qualifier: Stomatal closuree0

Verbatim

e0
“Stomatal closure could account thus for at least part of the decrease in photosynthesis at low temperatures”
✓ located verbatim in the source · abstract, characters 486–593

t0
“Ulmus americana and Fraxinus pennsylvanica”
✓ located verbatim in the source · title, characters 59–101

Title

Effects of low temperature on leaf diffusion resistance of Ulmus americana and Fraxinus pennsylvanica seedlings

T. T. Kozlowski; S. G. Pallardy Canadian Journal of Botany 1979. doi:10.1139/b79-291

Other claims from this paper (5)

Intervention effect Low temperatures increased leaf diffusion resistance in Ulmus americana seedlings.
Intervention effect Low temperatures increased leaf diffusion resistance in Fraxinus pennsylvanica seedlings.
Association The diffusion-resistance change increased as temperature fell from 10 to 3 °C.
Observation Leaf diffusion resistance recovered to prestress levels within one day after cold stress ended.
Observation Recovery speed did not differ significantly across exposure temperatures of 3 to 10 °C.

“decrease of the photosynthesis”

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