Search claims · PlantClaims

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

PSII-LHCII supercomplex and PSII dimer abundance fell.

Outcome: abundance of supercomplexes of PSII-LHCII and PSII dimere0
Direction: reducede0

Not reportedTaxon

Verbatim

e0
“the abundance of supercomplexes of PSII-LHCII and PSII dimer were reduced”
✓ located verbatim in the source · abstract, characters 652–725

Title

Reversible changes in structure and function of photosynthetic apparatus of pea (Pisum sativum) leaves under drought stress

Jayendra Pandey; Elsinraju Devadasu; Deepak Saini; et al. The Plant Journal 2022. doi:10.1111/tpj.16034

Other claims from this paper (10)

Observation Gas exchange parameters declined significantly under progressive drought.
Observation Photochemical efficiency of PSII and PSI decreased.
Observation Non-photochemical quenching and PSBS levels increased.
Observation Light-harvesting complexes and some PSI and PSII core proteins disassembled during drought.
Observation Those complexes reassociated during recovery.
Observation LHCII monomers increased with thylakoid reorganization.
Observation Thylakoid stacks became loosely arranged under drought.
Observation Severe drought reduced LHCI, LHCII, and some PSI and PSII reaction center proteins.
Observation Seven days after rewatering, chloroplast thylakoid structure and photosynthetic efficiency recovered.
Association Structural changes were associated with leaf reactive oxygen species levels.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Fruit PSII efficiency is similar to leaf PSII efficiency.

Taxon: cucumberCucumis sativust0
Organ / stage: leavese0
Outcome: efficiency of PSIIe0
Direction: similare0

Verbatim

e0
“The efficiency of PSII is similar to that in leaves”
✓ located verbatim in the source · abstract, characters 613–664

t0
“cucumber fruit”
✓ located verbatim in the source · title, characters 43–57

Title

The complex character of photosynthesis in cucumber fruit

Xiaolei Sui; Nan Shan; Liping Hu; et al. Journal of Experimental Botany 2017. doi:10.1093/jxb/erx034

Other claims from this paper (10)

Observation Cucumber exocarp chlorophyll content is similar to leaves.
Observation Cucumber fruit lacks distinctive palisade and spongy tissues.
Observation Fruit NPQ is lower than in leaves.
Observation Rubisco is mainly in the exocarp.
Observation PEPC is primarily in vascular bundles and placenta.
Observation Rubisco expression increases during fruit growth.
Observation PEPC expression increases during fruit growth.
Observation Exocarp photosynthesis contributes 9.4% to fruit carbon accumulation.
Observation Approximately 88% of respiratory CO2 is recaptured and refixed in fruit.
Mechanism Fruit photosynthesis contributes to cucumber fruit growth via atmospheric and respired CO2 fixation.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Chlorophyll molecules per PSII alpha, PSII beta and PSI were 230/100/200.

Taxon: spinachSpinacia oleraceat0
Outcome: N(PSII α )/N(PSII β )/N(PSI)e0
Value: 230/100/200e0

Verbatim

e0
“N(PSII α )/N(PSII β )/N(PSI)=230/100/200”
✓ located verbatim in the source · abstract, characters 494–534

t0
“SPINACH CHLOROPLASTS”
✓ located verbatim in the source · title, characters 92–112

Title

LIGHT‐ABSORPTION AND ELECTRON‐TRANSPORT BALANCE BETWEEN PHOTOSYSTEM II AND PHOTOSYSTEM I IN SPINACH CHLOROPLASTS

Anastasios MELIS; Michael Spangfort; Bertil Andersson Photochemistry and Photobiology 1987. doi:10.1111/j.1751-1097.1987.tb08413.x

Other claims from this paper (9)

Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

Maximum PSII quantum yield suggested no PSII damage at these night temperatures.

Taxon: PHALAENOPSISPhalaenopsist0
Outcome: no PSII damagee0

Not reportedDirection

Verbatim

e0
“maximum quantum yield of PSII photochemistry (F-v/F-m) suggested no PSII damage for these night temperatures”
✓ located verbatim in the source · abstract, characters 1231–1339

t0
“PHALAENOPSIS”
✓ located verbatim in the source · title, characters 54–66

Title

DETERMINING THE OPTIMAL NIGHTTIME AIR TEMPERATURE FOR PHALAENOPSIS DURING THE VEGETATIVE STAGE

B. Pollet; E. Storme; K. Steppe; et al. Acta Horticulturae 2011. doi:10.17660/actahortic.2011.893.95

Other claims from this paper (5)

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Salt and heat stress decreased PSII photochemistry (Fv/Fm) in spinach leaf PSII particles.

Taxon: spinachSpinacia oleraceae0
Organ / stage: leavese0
Treatment: Salt and heat stresse1
Outcome: PSII photochemistry (Fv/Fm)e1
Direction: decreasee1

Not reportedComparator

Verbatim

e0
“PSII (BBY particles of PSII) prepared from the leaves of spinach (Spinacia oleracea)”
✓ located verbatim in the source · abstract, characters 109–193

e1
“Salt and heat stress led to serious damage to PSII, inducing a marked decrease of PSII photochemistry (Fv/Fm)”
✓ located verbatim in the source · abstract, characters 376–485

Title

Role of Exogenous Sucrose in Protecting PSII Particles Against Salt Stress and Heat Stress

Nianwei Qiu; Ying Deng 植物学通报 2007. doi:10.3724/cbb-t26-365

Other claims from this paper (2)

Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Puma super significantly decreased maximum PSII photochemical efficiency, effective quantum yield and PSII potential activity.

Taxon: Perilla frutescens( L. ) Britt.Perilla frutescenst0
Treatment: Puma supere0
Outcome: maximum PSII photochemical efficiency,effective quantum yield of photochemical energy conversion in PSII,PSII potential activitye0
Direction: decreasede0

Not reportedComparator

Verbatim

e0
“Puma super significantly decreased maximum PSII photochemical efficiency,effective quantum yield of photochemical energy conversion in PSII,PSII potential activity”
✓ located verbatim in the source · abstract, characters 868–1031

t0
“Perilla frutescens( L. ) Britt.”
✓ located verbatim in the source · title, characters 34–65

Title

Puma stress alleviated by urea on Perilla frutescens( L. ) Britt. seedlings

Faqi Zhang Zhongguo youliao zuowu xuebao 2014

Other claims from this paper (11)

Intervention effect Puma super reduced the chlorophyll content index significantly.
Intervention effect Puma super reduced photosynthetic rate, stomatal conductance and transpiration rate.
Intervention effect Puma super increased intercellular CO2 concentration.
Intervention effect Puma super significantly decreased photochemical quenching of variable chlorophyll fluorescence.
Intervention effect Puma super decreased non-photochemical chlorophyll fluorescence quenching.
Intervention effect Moderate urea concentrations antagonized the negative effect of Puma super.
Intervention effect High urea concentration aggravated the negative effect of Puma super.
Intervention effect Spraying 4g / L urea followed by 1. 33mL / L Puma super increased seed yield by 11%.
Intervention effect Spraying 4g / L urea followed by 1. 33mL / L Puma super increased weed control efficiency by 11. 35%.
Intervention effect Urea followed by Puma super improved photosynthesis and PSII photochemical efficiency.
Recommendation The authors conclude that the urea and clethodium combination can balance fertilization and weeding and promote crop production.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Chilling inhibited PSII function and blocked electron transport at the PSII acceptor side.

Taxon: tomato seedlingsSolanum lycopersicumt0
Treatment: Chillinge0
Outcome: function of PSII and blocked electron transport at the PSII acceptor sidee0
Direction: inhibitede0

Not reportedComparator

Verbatim

e0
“Chilling inhibited the function of PSII and blocked electron transport at the PSII acceptor side”
✓ located verbatim in the source · abstract, characters 165–261

t0
“tomato seedlings”
✓ located verbatim in the source · title, characters 126–142

Title

Upregulation of the mitochondrial alternative oxidase pathway improves PSII function and photosynthetic electron transport in tomato seedlings under chilling stress

J.J. ZENG; W.H. HU; X.H. HU; et al. Photosynthetica 2022. doi:10.32615/ps.2022.019

Other claims from this paper (8)

Intervention effect Chilling caused photoinhibition in tomato seedlings despite increased thermal dissipation and cyclic electron flow.
Intervention effect Chilling increased thermal energy dissipation and cyclic electron flow around PSI.
Intervention effect Chilling did not affect the oxygen-evolving complex on the PSII donor side.
Intervention effect AOX pathway upregulation protected chilled tomato seedlings from photoinhibition.
Intervention effect AOX pathway upregulation improved PSII function and photosynthetic electron transport under chilling.
Mechanism The AOX pathway maintained the open state of PSII and stability of the photosynthetic electron transport chain.
Observation The AOX pathway protected PSII more than PSI.
Mechanism Increased CEF-PSI activity compensated for AOX pathway inhibition during chilling.

Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Vignoles PSII recovered faster than Cynthiana PSII.

Taxon: Grapest0
Material: ‘Vignoles’e0
Outcome: damaged PSIIe0
Direction: recovered fastere0
Comparator: ‘Cynthiana’e0

Verbatim

t0
“Grapes”
✓ located verbatim in the source · title, characters 59–65

e0
“The damaged PSII of ‘Vignoles’ recovered faster than that of ‘Cynthiana’.”
✓ located verbatim in the source · abstract, characters 1326–1399

Title

Photochemical Efficiency and Recovery of Photosystem II in Grapes After Exposure to Sudden and Gradual Heat Stress

Sorkel Kadir; Michael Von Weihe; Kassim Al-Khatib Journal of the American Society for Horticultural Science 2007. doi:10.21273/jashs.132.6.764

Other claims from this paper (9)

Intervention effect Longer high-temperature exposure lowered Fv/Fm in both cultivars under either heat treatment.
Intervention effect Heat stress progressively reduced total leaf area.
Intervention effect Heat stress progressively reduced leaf and shoot biomass.
Observation PSII maximum quantum efficiency was greatest after three days of exposure in both cultivars.
Observation Vignoles had higher PSII photochemical efficiency 12 days after heat exposure.
Intervention effect Gradual heat shock was less detrimental to PSII than sudden heat shock.
Association Fv/Fm was positively related to leaf area in heat-treated grapes.
Observation The authors inferred Vignoles was generally more heat tolerant than Cynthiana.
Method / resource The authors proposed Fv/Fm change as an indicator for screening heat-resistant grape cultivars.

Mechanismobservedoriginal resultmeasured

Claim · model-written summary

With a pH gradient, cyclic PSII flow accounted for excess PSII electron flux beyond linear flow.

Taxon: spinachSpinacia oleraceae1
Treatment: presence of (Delta)pHe0
Outcome: excess electron flux in PSIIe0
Qualifier: CEF-PSIIe0

Verbatim

e0
“In the presence of (Delta)pH, CEF-PSII accounted for the excess electron flux in PSII that could not be attributed to photosynthetic linear electron flow”
✓ located verbatim in the source · abstract, characters 1191–1344

e1
“spinach leaves”
✓ located verbatim in the source · abstract, characters 526–540

Title

Cyclic Electron Flow within PSII Functions in Intact Chloroplasts from Spinach Leaves

Chikahiro Miyake; Kuniaki Yonekura; Yoshichika Kobayashi; et al. Plant and Cell Physiology 2002. doi:10.1093/pcp/pcf113

Other claims from this paper (8)

Intervention effect Nigericin decreased PSII quantum yield in intact spinach chloroplasts.
Intervention effect Nigericin increased linear electron flow activity in intact spinach chloroplasts.
Association Relative electron flux in PSII was proportional to linear electron flow activity.
Association At a given linear electron flow, relative PSII electron flux was higher with a pH gradient than without it.
Observation Cyclic electron flow within PSII occurs in intact spinach chloroplasts.
Association Cyclic PSII flow activity increased with light intensity.
Association Cyclic PSII flow activity nearly corresponded to water-water cycle activity.
Mechanism Cyclic PSII flow may dissipate excess photon energy with the water-water cycle under limited photosynthesis.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

The authors explain the maintained PSII yield by enhanced dissipation of excess photon energy in the PSII antenna (non-photochemical quenching), protecting PSII from photodamage.

Taxon: tobaccoNicotiana tabacume1
Outcome: protection of PSII from photodamagee0
Qualifier: enhancement of efficiency for dissipation of excess photon energy in the PSII antennae0

Verbatim

e0
“enhancement of efficiency for dissipation of excess photon energy in the PSII antenna, determined as non-photochemical quenching, and consequently further protection of PSII from photodamage”
✓ located verbatim in the source · abstract, characters 845–1035

e1
“tobacco (Nicotiana rustica Basmas)”
✓ located verbatim in the source · abstract, characters 452–486

Title

EFFECT OF SALICYLIC ACID ON TOBACCO (NICOTIANA RUSTICA) PLANT UNDER DROUGHT CONDITIONS

Ghader Habibi; Sadeghipour Zienab; Hajiboland Roghieh DOAJ (DOAJ: Directory of Open Access Journals) 2015

Other claims from this paper (7)

“PSII”

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