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“dry weight decrease”

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Organism: Nicotiana tabacum ✕

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Starch decreased three- to fourfold but still reached 24% to 31% of dry weight.

Taxon: tobacco (Nicotiana tabacum L.)Nicotiana tabacume1
Outcome: starche0
Direction: decreasede0
Value: 3- to 4-folde0
Qualifier: 24% to 31% of dry weighte0

Verbatim

e0
“less starch, which was decreased by 3- to 4-fold, but still accumulated to 24% to 31% of dry weight”
✓ located verbatim in the source · abstract, characters 851–950

e1
“transgenic tobacco (Nicotiana tabacum L.)”
✓ located verbatim in the source · abstract, characters 194–235

Title

Decrease in Phosphoribulokinase Activity by Antisense RNA in Transgenic Tobacco. Relationship between Photosynthesis, Growth, and Allocation at Different Nitrogen Levels1

Fiona M. Banks; Simon P. Driscoll; Martin A.J. Parry; et al. PLANT PHYSIOLOGY 1999. doi:10.1104/pp.119.3.1125

Other claims from this paper (10)

Association PRK activation state rose as enzyme amount was genetically reduced at both nitrogen levels.
Intervention effect At high nitrogen, a 94% PRK activity decrease had only a 20% effect on photosynthesis and growth.
Intervention effect At low nitrogen, 94% lower PRK activity decreased leaf photosynthesis by up to 50%.
Intervention effect At low nitrogen, 94% lower PRK activity decreased whole-plant photosynthesis by up to 35%.
Association Plants with lower PRK activity were up to 35% smaller than plants with higher PRK activity.
Observation The smaller plants had less structural dry matter.
Observation Young leaves contained more starch than older leaves in older plants.
Observation Leaves had higher ion and water content.
Observation Specific leaf area was higher.
Observation Shoot to root allocation was unaltered.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Four days of water deprivation decreased photosynthetic CO2 assimilation.

Taxon: TobaccoNicotiana tabacumt0
Treatment: water deprivatione0
Outcome: rate of photosynthetic CO2 assimilatione0
Direction: decreasee0

Not reportedComparator

Verbatim

t0
“Tobacco”
✓ located verbatim in the source · title, characters 39–46

e0
“After 4 d of water deprivation, a large increase in the ratio of shoot dry weight to fresh weight was observed, together with a decrease in the rate of photosynthetic CO2 assimilation.”
✓ located verbatim in the source · abstract, characters 323–507

Title

Overexpression of Nitrate Reductase in Tobacco Delays Drought-Induced Decreases in Nitrate Reductase Activity and mRNA1

Sylvie Ferrario-Méry; Marie-Hélène Valadier; Christine H. Foyer PLANT PHYSIOLOGY 1998. doi:10.1104/pp.117.1.293

Other claims from this paper (19)

Intervention effect Drought changed biomass accumulation comparably in transformed and control plants.
Intervention effect Drought changed photosynthesis comparably in transformed and control plants.
Intervention effect Four days of water deprivation increased the shoot dry to fresh weight ratio.
Intervention effect Foliar sucrose rose in both lines during water stress.
Intervention effect Hexoses rose only in untransformed control leaves during water stress.
Intervention effect Foliar nitrate fell by half within two days of water deprivation in both lines.
Intervention effect Water deprivation reduced total foliar amino acids in both lines.
Intervention effect After four days without water, nitrate reductase activity was undetectable in untransformed leaves.
Intervention effect After four days without water, transformed leaves retained about 50% of original nitrate reductase activity.
Observation During early drought, nitrate reductase mRNA abundance rose in 35S-NR leaves but stayed constant in controls.
Observation During early drought, nitrate reductase mRNA abundance stayed constant in controls.
Intervention effect On drought day four, nitrate reductase mRNA fell in both lines.
Intervention effect Rehydration on day three rapidly restored 35S-NR transcripts within 24 hours.
Intervention effect Rehydration produced no transcript recovery in controls.
Intervention effect Long-term drought left nitrate reductase phosphorylation state unchanged.
Association Maximal extractable nitrate reductase activity strongly correlated with ambient photosynthesis in both lines.
Mechanism Authors infer that drought first accelerates nitrate reductase protein turnover then mRNA turnover.
Intervention effect Constitutive nitrate reductase expression temporarily delayed drought-related loss of enzyme activity.
Mechanism Authors suggest 35S-NR expression may hasten nitrogen assimilation recovery after short water deficit.

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