Claim · model-written summary
The authors conclude mannitol accumulation was enhanced by drought stress but did not affect osmotic potential or drought tolerance.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- drought stresse0
- Compound
- mannitole0
- Outcome
- π o or drought tolerancee0
Not reportedMaterialGeneOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco”
e0“mannitol accumulation was enhanced by drought stress but did not affect π o or drought tolerance”
Title
Salinity and drought tolerance of mannitol‐accumulating transgenic tobacco
B. KARAKAS; P. OZIAS‐AKINS; C. STUSHNOFF; et al. Plant Cell & Environment 1997. doi:10.1111/j.1365-3040.1997.00132.x
Other claims from this paper (15)
- Observation Non-stressed transgenic tobacco plants were 20-25% smaller than non-stressed wild-type plants.
- Intervention effect Salt stress reduced dry weight in wild-type tobacco plants by 44%.
- Intervention effect Salt stress did not reduce the dry weight of transgenic tobacco plants.
- Intervention effect Under salt stress, transgenic tobacco plants adjusted osmotically by 0.57 MPa.
- Intervention effect Under salt stress, wild-type tobacco plants did not adjust osmotically.
- Observation Calculations showed mannitol contributed only 0.003-0.004 MPa to the 0.2 MPa difference in full turgor osmotic potential between salt-stressed transgenic and wild-type plants.
- Observation Assuming a cytoplasmic location and cytoplasm at 5% of total water volume, mannitol accounted for only 30-40% of the change in osmotic potential of the cytoplasm.
- Intervention effect Inositol accumulated in response to salt stress in both transgenic and wild-type tobacco plants.
- Observation In transgenic tobacco plants, inositol was 3-fold more abundant than mannitol.
- Intervention effect Drought stress reduced leaf relative water content, leaf expansion and dry weight of transgenic and wild-type tobacco plants.
- Intervention effect Full turgor osmotic potential was not significantly reduced by drought stress in transgenic or wild-type tobacco plants.
- Intervention effect Non-structural carbohydrates and mannitol increased in droughted tobacco plants.
- Mechanism The authors conclude mannitol was a relatively minor osmolyte in transgenic tobacco but may have indirectly enhanced osmotic adjustment and salt tolerance.
- Mechanism The authors conclude inositol cannot substitute for mannitol in this role.
- Mechanism The authors conclude slower growth of the transgenic plants, not mannitol per se, may have caused the greater salt tolerance.