Search claims · PlantClaims

Mechanismauthor interpretationreview summarynegativebasis n/a

Claim · model-written summary

Leaf rust defoliation can decrease photosynthesis.

Taxon: southern highbush blueberriese1
Outcome: photosynthesise0
Direction: decreasee0
Qualifier: defoliatione0

Verbatim

e0
“Severe leaf rust causes defoliation in the fall or early winter, which can decrease floral bud differentiation, photosynthesis, and the next season’s fruit yield”
✓ located verbatim in the source · abstract, characters 151–312

e1
“southern highbush blueberries”
✓ located verbatim in the source · abstract, characters 37–66

Title

Leaf Rust Disease of Southern Highbush Blueberry in Florida

Philip F. Harmon; Christ Mane Belizaire; Douglas A. Phillips EDIS 2025. doi:10.32473/edis-pp385-2025

Other claims from this paper (4)

Associationobservedoriginal resultmeasured

Claim · model-written summary

The photosynthesis decrease was unrelated to increased glucose and fructose.

Taxon: treese0 t0
Compound: glucose and fructosee0 t0
Outcome: photosynthesise0 t0
Direction: unrelatede0 t0

Not reportedComparator

Verbatim

e0
“the decrease in photosynthesis was unrelated to the increase in glucose and fructose content.”
✓ located verbatim in the source · abstract, characters 1466–1559

t0
“trees”
✓ located verbatim in the source · title, characters 123–128

Title

Carbohydrate regulation of photosynthesis and respiration from branch girdling in four species of wet tropical rain forest trees

S. Asao; M. G. Ryan Tree Physiology 2015. doi:10.1093/treephys/tpv025

Other claims from this paper (9)

Intervention effect Girdling intensity caused no consistent or strong leaf carbohydrate response.
Intervention effect Glucose and fructose increased slightly by 3.4% per quarter girdle in all species.
Intervention effect Total carbon content increased 5.4% per quarter girdle in one species.
Intervention effect Leaf mass per area increased 5.5% per quarter girdle in one species.
Intervention effect Starch did not change with girdling.
Intervention effect Full girdling lowered photosynthesis in three of four species by 59-69%.
Intervention effect Girdling did not affect respiration.
Intervention effect Three-quarter phloem removal did not alter carbohydrates, photosynthesis, or respiration in three species.
Recommendation Authors recommend avoiding girdling for carbohydrate-regulation studies.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Photosynthesis tended to decrease under N deficiency but contributed little to reduced carbon gain.

Taxon: grapevineVitist0
Treatment: N deficiencye0
Outcome: photosynthesis ratee0
Direction: decreasee0

Verbatim

e0
“photosynthesis rate tended to decrease under N deficiency over the season, it only poorly contributed to the reduction in C gain”
✓ located verbatim in the source · abstract, characters 2580–2708

t0
“grapevine”
✓ located verbatim in the source · title, characters 21–30

Title

Gradual responses of grapevine yield components and carbon status to nitrogen supply

Sylvain Vrignon-Brenas; Metay Aurélie; Leporatti Romain; et al. OENO One 2019. doi:10.20870/oeno-one.2019.53.2.2431

Other claims from this paper (13)

Intervention effect Under low nitrogen, SPAD declined from 31 to 16 in the first year.
Intervention effect In year two, SPAD was 40 at 160N and 19 at 0N after budburst.
Observation SPAD differences among nitrogen treatments persisted through 2018 harvest.
Intervention effect Berry number per inflorescence ranged from 180 at 80N to 34 at 0N.
Intervention effect Individual berry dry matter increased from 0.13 at 160N to 0.41 g at 0N.
Association Lower N reduced carbon gain mainly through leaf area reduction before flowering.
Association Whole-plant carbon growth fell with declining nitrogen status by -1.13% at harvest.
Association Shoot dry matter was inhibited before veraison by -1.81%.
Association Berry dry matter was lower by -0.80% at harvest.
Association Trunk dry matter was lower by -0.42% at harvest.
Association Root dry matter was lower by -0.84% at harvest.
Association Lower root starch reserves were associated with root dry matter reduction at harvest.
Intervention effect Starch reserves tended to be higher under organic than mineral nitrogen supply.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

M. hupehensis had the smallest photosynthesis rate decrease, 7.06%.

Taxon: M.hupehensis Rehd.Malus hupehensise0
Outcome: photosynthesis ratee0
Direction: decreasee0
Value: 7.06%e0

Not reportedTreatmentComparator

Verbatim

e0
“M.hupehensis Rehd.exhibited the lowest decrease in photosynthesis rate,chlorophyll and carotinoid contents,i.e.7.06%,9.15%and 8.17%,respectively.”
✓ located verbatim in the source · abstract, characters 436–581

Title

Study on the Difference of Adaptability to Replant Soil in Five Apple Rootstock Seedlings

Yuanzheng Wang Acta Horticulturae Sinica 2011

Other claims from this paper (11)

Intervention effect Replant soil reduced photosynthesis rate and leaf phytochrome content in all rootstocks.
Intervention effect M. hupehensis had the smallest chlorophyll decrease, 9.15%.
Intervention effect M. hupehensis had the smallest carotenoid decrease, 8.17%.
Intervention effect Replant soil increased root antioxidant enzymes and malondialdehyde in apple rootstocks.
Intervention effect M. hupehensis root SOD activity increased by 3.72%, the smallest increase.
Intervention effect M. hupehensis root POD activity increased by 26.60%, the smallest increase.
Intervention effect M. hupehensis root CAT activity increased by 23.78%, the smallest increase.
Intervention effect M. hupehensis root MDA content increased by 15.24%.
Intervention effect M. micromalus had the greatest MDA increase, 54.56%.
Intervention effect Replant conditions reduced biomass, height and ground diameter in all five rootstocks.
Observation M. hupehensis had the best tolerance to apple replant disease among the tested rootstocks.

Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

A decrease in internal conductance partly constrained potential photosynthesis gains in Q. petraea.

Taxon: Q. petraeae1
Outcome: potential increase in photosynthesise0
Qualifier: decrease in internal conductancee0

Verbatim

e0
“this potential increase in photosynthesis was at least partially hamstrung by a decrease in internal conductance”
✓ located verbatim in the source · abstract, characters 1520–1632

e1
“In Q. petraea”
✓ located verbatim in the source · abstract, characters 1319–1332

Title

Light acclimation at the end of the growing season in two broadleaved oak species

F. J. Cano; D. Sánchez-Gómez; A. Gascó; et al. Photosynthetica 2011. doi:10.1007/s11099-011-0066-3

Other claims from this paper (12)

Intervention effect Transfer to high light caused photoinhibition in Q. pyrenaica.
Intervention effect Q. pyrenaica had little VCmax or Jmax acclimation 21 days after transfer.
Intervention effect Transferred Q. pyrenaica had lower stomatal conductance than low light plants.
Mechanism Stomatal closure was the main photosynthesis limitation after transfer in Q. pyrenaica.
Intervention effect Higher evaporative demand did not change hydraulic conductivity in Q. pyrenaica.
Intervention effect Q. petraea had greater gas exchange acclimation than Q. pyrenaica after transfer.
Intervention effect Transferred Q. petraea gas exchange reached low light plant rates after two weeks.
Intervention effect Q. petraea VCmax increased significantly after transfer.
Association The increase in Q. petraea VCmax lowered its Jmax/VCmax ratio below high light plants.
Intervention effect Neither oak reached the photosynthetic rates of high light grown plants.
Observation Q. petraea leaves showed a trend toward acclimation.
Intervention effect Transfer harmed shade developed Q. pyrenaica leaves.

Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

The decrease in photosynthesis did not have a corresponding decrease in transpiration rate.

Taxon: Sangiovese Grapevinet0
Outcome: transpiration ratee0
Direction: reductione0

Verbatim

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

e0
“A corresponding reduction in the transpiration rate was not observed”
✓ located verbatim in the source · abstract, characters 679–747

Title

Effects of Soil Management on Physiological, Vegetative and Reproductive Characteristics of Sangiovese Grapevine

Giovan Battista Mattii; Francesco Ferrini; P. Storichi Florence Research (University of Florence) 2005. doi:10.1400/14429

Other claims from this paper (10)

Intervention effect Ground cover decreased vine net photosynthesis relative to soil tilling.
Observation Tall fescue had the lowest net photosynthesis in both years.
Observation Soil tilling had the highest net photosynthesis in both years.
Mechanism The reduction in photosynthesis was interpreted as regulated by a non-stomatal mechanism.
Intervention effect Grass-covered plots reduced pruning material weight, shoot growth and leaf area per vine in both years.
Intervention effect Groundcover reduced vine yields, especially Tall fescue.
Intervention effect Groundcover lowered cluster number.
Intervention effect Groundcover lowered cluster weight.
Intervention effect All grass covers reduced time between veraison and harvest, especially fescue.
Recommendation Groundcover was proposed for dry areas to improve berry quality and harvest date.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

Leaf water potential apparently primarily controls changes in clear-day photosynthesis, especially the midday decrease.

Taxon: conifersPinopsidae1
Outcome: pattern of photosynthesise0
Qualifier: changes in leaf water potentiale0

Verbatim

e0
“Changes in the pattern of photosynthesis on clear days, especially the midday decrease, are apparently primarily controlled by changes in leaf water potential.”
✓ located verbatim in the source · abstract, characters 105–264

e1
“six different conifers”
✓ located verbatim in the source · abstract, characters 22–44

Title

Patterns of Photosynthesis under Natural Environmental Conditions

John D. Hodges Ecology 1967. doi:10.2307/1933105

Other claims from this paper (9)

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.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

The afternoon decrease in net photosynthesis was associated with depressed ΦPS2 under high PPFD.

Taxon: grapevineVitist0
Outcome: PNe0
Direction: decreasee0
Comparator: ΦPS2e0

Verbatim

e0
“decrease in PN after midday under saturating PPFD was also associated with the observed depression of ΦPS2 at high PPFD”
✓ located verbatim in the source · abstract, characters 709–828

t0
“grapevine”
✓ located verbatim in the source · title, characters 71–80

Title

Stomatal and non-stomatal limitations to photosynthesis in field-grown grapevine cultivars

D. J. Yu; S. J. Kim; H. J. Lee Biologia Plantarum 2009. doi:10.1007/s10535-009-0019-x

Other claims from this paper (7)

Observation Net photosynthetic rate increased in the morning.
Observation Net photosynthesis saturated at PPFD 1200 to 1500 between 10:00 and 12:00.
Observation Net photosynthesis decreased after midday.
Observation Maximum net photosynthesis in Campbell Early was 13.7 µmol m-2 s-1.
Observation Maximum net photosynthesis in Kyoho was 12.5 µmol m-2 s-1.
Association Stomatal conductance and transpiration changed in parallel with net photosynthesis.
Mechanism The authors suggest afternoon vapour pressure deficit may contribute to declining gs and PN.

Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Cadmium-associated growth inhibition accompanied a significant decrease in net photosynthesis.

Taxon: B. schmidtiiBetula schmidtiie0
Treatment: Cd treatmente1
Outcome: net photosynthesis measured as $CO_2$ assimilatione0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“the growth inhibition of B. schmidtii seedlings was accompanied by a significant decrease in net photosynthesis measured as $CO_2$ assimilation”
✓ located verbatim in the source · abstract, characters 1108–1251

e1
“Cd treatment levels of three families”
✓ located verbatim in the source · abstract, characters 798–835

Title

Differences in Growth and Photosynthesis among Three Half-sib Families of Betula schmidtii in Response to Cd Treatment

;;;; The Korean Journal of Ecology 2004. doi:10.5141/jefb.2004.27.3.147

Other claims from this paper (4)

“decrease of the photosynthesis”

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