Search claims · PlantClaims

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Whole plant NUE showed no consistent response to elevated CO2 when plants received high N.

Taxon: plantsViridiplantaee0
Treatment: elevated CO2e0
Outcome: Whole plant NUEe0
Direction: no consistent responsee0
Qualifier: high Ne0

Not reportedComparator

Verbatim

e0
“Whole plant NUE showed no consistent response to elevated CO2 when plants were supplied high N”
✓ located verbatim in the source · abstract, characters 1679–1773

Title

CO2 × Nitrogen Interaction on Seedling Growth of Four Species of Eucalypt.

SC Wong; PE Kriedemann; GD Farquhar Australian Journal of Botany 1992. doi:10.1071/bt9920457

Other claims from this paper (15)

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Eragrostis racemosa had no significant response to high CO2 in late season.

Taxon: Eragrostis racemosaEragrostis racemosae0
Treatment: high CO2e0
Outcome: responsese0
Direction: no significant responsese0

Not reportedComparator

Verbatim

e0
“Eragrostis racemosa (C4), a slow grower, showed no significant responses to high CO2 during the late season”
✓ located verbatim in the source · abstract, characters 1011–1118

Title

Response to elevated CO₂from a natural spring in a C₄-dominated grassland depends on seasonal phenology

SJE Wand; GF Midgley; WD Stock African Journal of Range and Forage Science 2002. doi:10.2989/10220110209485779

Other claims from this paper (5)

Intervention effect High CO2 significantly enhanced early season photosynthetic efficiency in Alloteropsis semialata.
Intervention effect High CO2 significantly enhanced early season photosynthetic efficiency in Andropogon appendiculatus.
Association Photosynthetic capacity of Alloteropsis semialata declined as the season advanced.
Association Photosynthetic capacity of Andropogon appendiculatus declined as the season advanced.
Intervention effect Elevated CO2 maintained Themeda triandra photosynthetic capacity in mid to late season while ambient capacity fell.

Associationobservedoriginal resultno effectmeasured

Claim · model-written summary

High growth rate was not correlated with greater response to elevated CO2 under experimental conditions.

Taxon: ponderosa pinet0
Material: high growth ratee0
Outcome: greater response to elevated CO(2)e0

Not reportedDirection

Verbatim

e0
“Under the experimental conditions, high growth rate was not correlated with a greater response to elevated CO(2)”
✓ located verbatim in the source · abstract, characters 1688–1800

t0
“ponderosa pine”
✓ located verbatim in the source · title, characters 53–67

Title

Physiological adjustment of two full-sib families of ponderosa pine to elevated CO2

N. E. Grulke; J. L. Hom; S. W. Roberts Tree Physiology 1993. doi:10.1093/treephys/12.4.391

Other claims from this paper (8)

Intervention effect Elevated CO2 initially stimulated carbon exchange rate by more than 100%.
Intervention effect On day 1, seedlings grown at elevated CO2 had significantly lower CER at ambient measurement CO2.
Intervention effect By day 39, CER under elevated growth and measurement CO2 was not significantly different from ambient conditions.
Intervention effect After four months, light compensation point, saturation CER, and quantum efficiency did not differ significantly between growth treatments.
Intervention effect A short-term CO2 increase significantly raised CER at light saturation.
Intervention effect A short-term CO2 increase significantly raised apparent quantum efficiency.
Intervention effect Elevated CO2 significantly increased leaf C/N ratio.
Observation Families showed few significant differences in response to elevated CO2.

Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

Wheat grown in the two cultivation environments did not differ in response to high CO2.

Taxon: wheatTriticum aestivume0
Outcome: response to high [CO2]e0
Direction: no differencese0
Comparator: soilless media in a glasshousee0
Setting: growth chamberse0

Verbatim

e0
“there were no differences in the response to high [CO2] between wheat grown hydroponically in growth chambers under fluorescent lights and those grown in soilless media in a glasshouse under sunlight and high pressure sodium lamps”
✓ located verbatim in the source · abstract, characters 1272–1502

Title

Very High CO2Reduces Photosynthesis, Dark Respiration and Yield in Wheat

J REUVENI Annals of Botany 1997. doi:10.1006/anbo.1997.0489

Other claims from this paper (16)

Intervention effect Raising CO2 from 350 to 1000 micromoles mol-1 increased wheat seed yield by 33%.
Intervention effect Raising CO2 from 350 to 1000 micromoles mol-1 increased vegetative biomass by 25%.
Intervention effect Raising CO2 from 350 to 1000 micromoles mol-1 increased heads per square meter by 34%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased seed yield by 37%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased harvest index by 14%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased mass per seed by 9%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased seeds per head by 29%.
Intervention effect Very high CO2 had negligible, nonsignificant effects on vegetative biomass, heads per square meter, and seed mass per head.
Intervention effect Seed yield, harvest index and seeds per head sharply decreased between 1000 and 2600 micromoles mol-1 CO2.
Intervention effect Further raising CO2 from 2600 to 10000 micromoles mol-1 produced a smaller further decrease in those yield traits.
Observation The two wheat cultivars responded similarly to CO2 across growth parameters.
Association High CO2 was not correlated with ethylene production by wheat flag leaves or heads.
Intervention effect Whole-plant photosynthetic rate was 8% lower at 2600 micromoles mol-1 CO2 than at ambient CO2.
Intervention effect Wheat head dark respiration was 25% lower at 2600 micromoles mol-1 CO2 than at ambient CO2.
Mechanism The authors attribute reduced seed set mainly to reduced dark respiration in wheat heads.
Mechanism The authors conclude that ethylene does not mediate reduced wheat seed set.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

tillering response inhibited under elevated CO2.

Taxon: RiceOryza sativat0
Outcome: tillering responsee0
Direction: inhibitede0

Not reportedTreatmentComparator

Verbatim

e0
“The delay totally inhibited the tillering response to high CO2”
✓ located verbatim in the source · abstract, characters 1147–1209

t0
“Rice”
✓ located verbatim in the source · title, characters 28–32

Title

Accelerated Early Growth of Rice at Elevated CO2 (Is It Related to Developmental Changes in the Shoot Apex?)

D. S. Jitla; G. S. Rogers; S. P. Seneweera; et al. PLANT PHYSIOLOGY 1997. doi:10.1104/pp.115.1.15

Other claims from this paper (8)

Intervention effect height and diameter of the apical dome and lengths of leaf primordia and tiller buds increased under elevated CO2.
Intervention effect numbers no effect under elevated CO2.
Intervention effect tiller buds five under elevated CO2.
Intervention effect relative growth rates of the shoot and tillers increases under elevated CO2.
Intervention effect tiller number increase under elevated CO2.
Intervention effect grain yield enhancement under elevated CO2.
Intervention effect grain yield increase under elevated CO2.
Mechanism Greater grain number per panicle explained the 20% yield increase after delayed CO2 exposure.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Adding high nitrogen to elevated CO2 did not further enhance the photosynthetic response.

Taxon: Scots pinePinus sylvestrise1
Treatment: combined elevated CO(2) + high nitrogen-supply treatmente0
Outcome: photosynthetic responsee0
Direction: did not enhancee0
Comparator: elevated CO(2) treatment alonee0

Verbatim

e0
“the combined elevated CO(2) + high nitrogen-supply treatment did not enhance the photosynthetic response above that observed in the elevated CO(2) treatment alone.”
✓ located verbatim in the source · abstract, characters 1207–1370

e1
“Scots pine (Pinus sylvestris L.)”
✓ located verbatim in the source · abstract, characters 17–49

Title

Photosynthetic responses of Scots pine to elevated CO2 and nitrogen supply: results of a branch-in-bag experiment

S. Kellomaki; K.-Y. Wang Tree Physiology 1997. doi:10.1093/treephys/17.4.231

Other claims from this paper (6)

Intervention effect Elevated CO2 did not significantly downregulate maximum carboxylation or electron transport rates.
Intervention effect Elevated CO2 significantly decreased light-saturated stomatal conductance.
Intervention effect Elevated CO2 significantly increased minimum stomatal conductance.
Intervention effect Light-saturated CO2 assimilation was 24-31% higher with elevated CO2 than ambient CO2 across treatment durations and nitrogen regimes.
Intervention effect High soil nitrogen significantly increased photosynthetic capacity.
Intervention effect High soil nitrogen significantly increased maximum carboxylation and electron transport rates.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Elevated CO2 did not alleviate drought response.

Taxon: maisZea mayst0
Outcome: response to drought stresse0
Direction: did not alleviatee0

Not reportedTreatmentComparator

Verbatim

t0
“mais”
✓ located verbatim in the source · title, characters 63–67

e0
“this effect did not alleviate the response to drought stress”
✓ located verbatim in the source · abstract, characters 506–566

Title

Effect of elevated CO2 concentration and nitrogen nutrition on mais response to short-term high temperature and drought stress

Simor, J. Digital Repository (National Repository of Grey Literature) 2021

Other claims from this paper (6)

Intervention effect Elevated CO2 improved water use efficiency.
Intervention effect Under some factor combinations elevated CO2 decreased CO2 assimilation during drought.
Association Stay-green differences had little effect on heat and drought response.
Intervention effect In Korynt, unfertilized plants had lower drought response of CO2 assimilation.
Intervention effect Higher nitrogen slightly alleviated response under elevated CO2.
Intervention effect No nitrogen fertilization increased drought resilience under ambient CO2.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

After 32 days, photosynthesis in HG under high CO2 dropped to the ambient-CO2 level.

Taxon: Hedera helix L.Hedera helixe1
Material: HGe0
Treatment: high CO2e0
Outcome: PNe0
Direction: droppede0
Qualifier: After 32 de0
Comparator: ambient CO2 grown plantse0

Verbatim

e0
“After 32 d of exposure to high CO2, PN of HG at high CO2 had dropped to that of the ambient CO2 grown plants”
✓ located verbatim in the source · abstract, characters 284–392

e1
“Hedera helix L.”
✓ located verbatim in the source · abstract, characters 76–91

Title

Effect of leaf variegation on acclimation of photosynthesis and growth response to elevated ambient CO₂

J. -H. Li; J. Gale; M. Volokita; et al. The Journal of Horticultural Science and Biotechnology 2000. doi:10.1080/14620316.2000.11511307

Other claims from this paper (6)

Intervention effect Initially, elevated CO2 raised photosynthesis in green sectors of both varieties by 90%.
Intervention effect After 32 days, HV photosynthesis remained 48% higher under elevated than ambient CO2.
Intervention effect Vcmax decreased over time under elevated CO2 in both varieties, more strongly in HG.
Intervention effect Jmax decreased over time under elevated CO2 in both varieties, more strongly in HG.
Intervention effect Elevated CO2 increased relative growth rate in HV plants.
Intervention effect Elevated CO2 did not increase relative growth rate in HG plants.

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Root respiration did not change significantly under high CO2.

Taxon: PlantsViridiplantaet0
Treatment: high CO2e0
Outcome: root respiratione0
Direction: no significant changee0

Not reportedComparator

Verbatim

e0
“For the few data on root respiration, no significant change due to high CO2 could be detected.”
✓ located verbatim in the source · abstract, characters 393–487

t0
“Plants”
✓ located verbatim in the source · title, characters 100–106

Title

A Quantitative-Analysis of Dark Respiration and Carbon Content as Factors in the Growth-Response of Plants to Elevated CO2

H Poorter; RM Gifford; PE Kriedemann; et al. Australian Journal of Botany 1992. doi:10.1071/bt9920501

Other claims from this paper (8)

Intervention effect Leaf respiration per unit area was 16% higher under high CO2.
Intervention effect Leaf respiration per unit weight decreased by 14% under high CO2.
Intervention effect Leaf carbon content increased by 1.2% under elevated CO2.
Intervention effect Stem carbon content increased by 1.7% under elevated CO2.
Intervention effect Root carbon content was not significantly affected by elevated CO2.
Observation Responses in both respiration and carbon content varied in direction.
Association Sensitivity analysis identified respiration rate and carbon content changes as factors affecting growth response to elevated CO2.
Recommendation Comprehensive analyses of growth responses to increased CO2 should measure respiration rate and carbon content.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

High night-time warming showed no different growth or CO2 response from constant warming.

Taxon: Phalaris aquaticaPhalaris aquaticat0
Treatment: high night-time warminge0
Outcome: plant growth and plant responses to elevated atmospheric CO2e0
Direction: No evidencee0
Comparator: constant warminge0

Verbatim

e0
“No evidence was found that high night-time warming had different effects on plant growth and plant responses to elevated atmospheric CO2, than constant warming.”
✓ located verbatim in the source · abstract, characters 909–1069

t0
“Phalaris aquatica cv. Holdfast swards”
✓ located verbatim in the source · abstract, characters 108–145

Title

Does greater night‐time, rather than constant, warming alter growth of managed pasture under under ambient and elevated atmospheric CO₂?

A. Volder; E. J. Edwards; J. R. Evans; et al. New Phytologist 2004. doi:10.1111/j.1469-8137.2004.01025.x

Other claims from this paper (6)

Intervention effect Elevated atmospheric CO2 raised aboveground biomass production by 11% over 20 months.
Intervention effect Constant warming had no effect on aboveground biomass production.
Intervention effect High night-time warming had no effect on aboveground biomass production.
Intervention effect Frequent cutting reduced aboveground biomass production by 19%.
Observation Treatment responses were strongly seasonal.
Intervention effect The positive CO2 response was statistically significant only in spring.

“response to high [CO2]”

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