Search claims · PlantClaims

Associationobservedoriginal resultmeasured

Claim · model-written summary

Gamma irradiation dose and bud survival show a plateau with no decrease in survival, followed by a straight-line decrease.

Taxon: Nicotiana sylvestris and Nicotiana tabacumNicotiana sylvestrisNicotiana tabacumt0
Organ / stage: axillary budst0
Treatment: gamma irradiatione0
Outcome: bud survivale0
Direction: straight line decreasee0
Qualifier: plateau (no decrease in survival)e0
Setting: in vitrot0

Verbatim

e0
“The Dose/Action relationship between gamma irradiation and bud survival, plotted on log-linear axes, produces a plateau (no decrease in survival) followed by a straight line decrease”
✓ located verbatim in the source · abstract, characters 0–182

t0
“Effect of gamma radiation on organs and cells of higher plants cultivated in vitro. Dose effect on survival of axillary buds of haploid and diploid Nicotiana sylvestris and Nicotiana tabacum”
✓ located verbatim in the source · title, characters 1–191

Title

[Effect of gamma radiation on organs and cells of higher plants cultivated in vitro. Dose effect on survival of axillary buds of haploid and diploid Nicotiana sylvestris and Nicotiana tabacum].

J Mousseau; M Delbos; E Delcher PubMed 1977

Other claims from this paper (1)

Association The length of the plateau and the slope of the line appear to depend on the degree of ploidy and the genome structure.

Mechanismobservedoriginal resultpositivemeasured

Claim · model-written summary

Decreased uptake partially contributed to reduced incorporation.

Taxon: tobaccoNicotiana tabacumt0
Outcome: decrease in uptakee0
Direction: decreasee0
Qualifier: partially due to a decrease in uptakee0

Verbatim

e0
“partially due to a decrease in uptake”
✓ located verbatim in the source · abstract, characters 699–736

t0
“Carrot and Tobacco”
✓ located verbatim in the source · title, characters 20–38

Title

Characterization of Carrot and Tobacco Cell Cultures Resistant to p-Fluorophenylalanine

J. Elizabeth Palmer; Jack Widholm PLANT PHYSIOLOGY 1975. doi:10.1104/pp.56.2.233

Other claims from this paper (11)

Observation Resistant tobacco cells grow at concentrations 10 times inhibitory to susceptible cells.
Observation Resistant carrot cells grow at more than 100 times inhibitory concentrations.
Observation Resistance persisted over 50 generations without the analog.
Observation All 14 clones from the resistant carrot line remained resistant.
Observation Resistant lines incorporated less p-fluorophenylalanine into protein.
Observation Free phenylalanine and tyrosine levels rose in resistant carrots.
Observation Resistant tobacco lines had greater chorismate mutase activity.
Observation Chorismate mutase was less sensitive to inhibition in resistant tobacco.
Observation Phenylalanine and tyrosine did not accumulate above normal levels in resistant tobacco.
Observation Phenolic compound levels were six times higher in resistant tobacco cells.
Mechanism The authors interpret resistance as caused by mutation.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Excessive dehydration of tobacco leaf tissue is associated with a parallel decrease in photosynthetic activity.

Taxon: tobaccoNicotiana tabacume0
Treatment: excessive dehydratione6
Outcome: photosynthetic activitye6
Direction: decreasee6

Verbatim

e0
“Removal of the lower epidermis from a tobacco leaf allows a faster and wider range of water fluxes, without damaging the mesophyll”
✓ located verbatim in the source · abstract, characters 0–130

e6
“The excessive dehydration is also characterized by a major increase in permeability (monitored by efflux of ions and materials absorbing ultraviolet light) and by a parallel decrease in photosynthetic activity”
✓ located verbatim in the source · abstract, characters 878–1087

Title

Dehydration, Water Fluxes, and Permeability of Tobacco Leaf Tissue

Y. Graziani; A. Livne PLANT PHYSIOLOGY 1971. doi:10.1104/pp.48.5.575

Other claims from this paper (9)

Associationobservedoriginal resultmeasured

Claim · model-written summary

Decrease of chlorophyll during leaf growth was accompanied by a decline of PPO and PRO activities

Taxon: TobaccoNicotiana tabacumt0
Organ / stage: leaf growthe3
Gene: PPO and PROe3
Outcome: PPO and PRO activitiese3
Direction: declinee3

Verbatim

t0
“Chlorophyll Mutants of Tobacco”
✓ located verbatim in the source · title, characters 27–57

e3
“Decrease of the latter during leaf growth was accompanied with a decline of PPO and PRO activities”
✓ located verbatim in the source · abstract, characters 498–596

Title

Polyphenol Accumulation in Chlorophyll Mutants of Tobacco under Two Cultural Practices

S.J. Sheen; D. W. DeJong; J. F. Chaplin Beiträge zur Tabakforschung international 1979. doi:10.2478/cttr-2013-0469

Other claims from this paper (11)

Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Experimental elimination of shading during ontogenesis of the 18th tobacco leaf resulted in a relatively slower decrease in net photosynthetic CO2 uptake.

Taxon: tobaccoNicotiana tabacume1
Treatment: Experimental elimination of the influence of shadinge0
Outcome: P Ne0
Direction: slower decreasee0

Not reportedComparator

Verbatim

e0
“Experimental elimination of the influence of shading during the involved period of ontogenesis of the 18th leaf manifested itself by a relatively slower decrease inP N”
✓ located verbatim in the source · abstract, characters 404–571

e1
“tobacco leaves”
✓ located verbatim in the source · abstract, characters 374–388

Title

Comparison of the changes in net photosynthetic CO2 uptake and water vapour efflux during leaf ontogenesis with the differences between the leaves according to their descending insertion level

J. Václavík Biologia Plantarum 1975. doi:10.1007/bf02921052

Other claims from this paper (2)

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Recurrent selection predicted a decrease in cured leaf yield of tobacco in each cycle

Taxon: Nicotiana tabacumNicotiana tabacume0
Outcome: yield of cured leafe2
Direction: decreasee2
Qualifier: predictede2

Verbatim

e0
“Recurrent selection for increased alkaloids from a cross of two low alkaloid tobacco ( Nicotiana tabacum L.) lines raised the population mean from the average of the two parents in the unselected population, to the high parent in one cycle of selection”
✓ located verbatim in the source · abstract, characters 0–252

e2
“A predicted decrease in yield of cured leaf in each cycle was obtained”
✓ located verbatim in the source · abstract, characters 330–400

Title

Recurrent Family Selection and Correlated Response in Nicotina tabacum L. I. ‘Dixie Bright 244’ ✕ ‘Coker 139’¹

D. F. Matzinger; E. A. Wernsman; C. Clark Cockerham Crop Science 1972. doi:10.2135/cropsci1972.0011183x001200010014x

Other claims from this paper (5)

Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

The gibberellic acid response of tobacco callus includes a decrease in percentage of dry weight relative to control tissues.

Taxon: tobaccoNicotiana tabacume1
Treatment: gibberellic acide5
Outcome: percentage of dry weighte5
Direction: decreasee5
Comparator: control tissuese5

Verbatim

e1
“Logarithmic growth rates (either fresh or dry weight basis) of tobacco callus tissues grown on 10(-4) to 10(-1) mum cytokinin are increased if gibberellic acid (10(-3)-2 mum) is incorporated into the medium”
✓ located verbatim in the source · abstract, characters 0–206

e5
“The gibberellic acid response includes a decrease in percentage of dry weight relative to control tissues”
✓ located verbatim in the source · abstract, characters 525–630

Title

Modification of Logarithmic Growth Rates of Tobacco Callus Tissue by Gibberellic Acid

John P. Helgeson; C. D. Upper PLANT PHYSIOLOGY 1970. doi:10.1104/pp.46.1.113

Other claims from this paper (8)

Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

BA at 10−6M inhibited the dark-induced decrease of chloroplast rRNA in tobacco leaf disks.

Taxon: tobaccoNicotiana tabacumt0
Organ / stage: leaf diskse1
Treatment: 10−6M BAe2
Outcome: chloroplast rRNAe1
Direction: inhibitede2

Not reportedComparator

Verbatim

t0
“senescence in tobacco leaf disks”
✓ located verbatim in the source · title, characters 11–43

e1
“In tobacco leaf disks floated on water in the dark, chloroplast rRNA (23S and 16S rRNA) decreased rapidly”
✓ located verbatim in the source · abstract, characters 0–105

e2
“this decrease was inhibited by 10−6M BA”
✓ located verbatim in the source · abstract, characters 111–150

Title

A study on senescence in tobacco leaf disks II. Chloroplast and cytoplasmic rRNAs

Tsutomu Takegami Plant and Cell Physiology 1975. doi:10.1093/oxfordjournals.pcp.a075157

Other claims from this paper (6)

Intervention effect In tobacco leaf disks floated on water in the dark, chloroplast rRNA decreased rapidly.
Intervention effect Cycloheximide at 10−5M completely removed the effect of BA on tobacco leaf disks.
Intervention effect During a 4-day culture in the light, chloroplast rRNA decreased in tobacco leaf disks.
Intervention effect During a 4-day culture in the light, cytoplasmic rRNA increased in tobacco leaf disks.
Intervention effect BA had no influence on the light-induced changes in rRNA.
Intervention effect Cytoplasmic rRNA level changed little during dark incubation with or without BA in tobacco leaf disks.

Observationobservedoriginal resultmixedmeasured

Claim · model-written summary

RuDP carboxylase activity was nearly constant except for a decrease in youngest leaves.

Taxon: tobaccoNicotiana tabacumt0
Organ / stage: youngeste0
Gene: RuDP carboxylasee0
Outcome: activitye0
Direction: decreasede0

Verbatim

e0
“RuDP carboxylase had nearly constant activity in all leaves, except for the youngest in which activity decreased”
✓ located verbatim in the source · abstract, characters 707–819

t0
“tobacco leaves”
✓ located verbatim in the source · title, characters 21–35

Title

Effect of the age of tobacco leaves on photosynthesis and photorespiration¹

Takuro Kisaki; Seishiro Hirabayashi; Noriko Yano Plant and Cell Physiology 1973. doi:10.1093/oxfordjournals.pcp.a074886

Other claims from this paper (10)

Observation P-glycolate phosphatase and glycolate oxidase peaked in the 25th tobacco leaf.
Observation Photorespiration peaked in the 25th leaf.
Observation Serine-14C to glycine-14C ratio peaked in the 25th leaf.
Observation Glycolate formation peaked in the 25th leaf.
Observation Three photorespiratory enzymes were more active in upper tobacco leaves.
Observation CO2 photosynthesis peaked in the upper youngest leaf.
Observation C4 dicarboxylic acid cycle enzyme activity peaked in the upper youngest leaf.
Association Photosynthetic CO2 fixation distribution did not coincide with RuDP carboxylase activity.
Association Photosynthetic capacity appeared better related to C4 pathway enzyme distribution in upper leaves.
Mechanism Authors suggest C4 dicarboxylic acid pathway contributes to photosynthesis in young tobacco leaves.

Associationobservedoriginal resultmeasured

Claim · model-written summary

Total leaf number tended to decrease as later planting dates were used, with 27.6, 30.8 and 33.0 leaves for the January 10, January 30 and February 20 plantings.

Taxon: tobaccoNicotiana tabacume1
Treatment: planting time was advancede1
Outcome: number of total leavese1
Direction: decreasee1
Value: 27.6, 30.8 and 33.0 leavese1
Qualifier: tendencye1

Verbatim

e1
“There was a tendency for number of total leaves to decrease as the planting time was advanced; 27.6, 30.8 and 33.0 leaves on tobacco planted on January 10, 30 and February 20, respectively (Table 1)”
✓ located verbatim in the source · abstract, characters 463–661

Title

Studies on Tobacco Culture in the Subtropic Conditions II. The growth of tobacco as related to different planting times in the district of Okinawa

Yoshihiko AKIMOTO; Tadashi NAKAYAMA Japanese Journal of Crop Science 1978. doi:10.1626/jcs.47.278

Other claims from this paper (16)

“decrease in A”

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