Abstract
The leaf and root tissue water relations of Quercusalba L., Quercusmacrocarpa Michx., and Quercusstellata Wang. seedlings before and after drought were examined to evaluate the occurrence and comparative extent of osmotic adjustment in seedlings of these species. Drought resulted in active osmotic adjustment in leaves of all three species, with decreases in osmotic potential at full tissue hydration and at the turgor loss point from 0.25 to 0.60 MPa. Active osmotic adjustment in Q. stellata, and increased root tissue elasticity in Q. macrocarpa and Q. alba, resulted in turgor loss of roots occurring at a water potential 0.36 to 0.66 MPa lower in drought-stressed than in well-watered seedlings. Species differed in tissue water relations only before drought, with Q. stellata exhibiting lower osmotic potentials than Q. alba and Q. macrocarpa. Estimates of the osmotic potential at full saturation were generally lower in leaves than in roots, but the osmotic potential at turgor loss was similar. Roots exhibited turgor loss at lower values of relative water content and experienced a more gradual decrease in water potential per unit water content during dehydration than did leaves. This response indicates greater relative tissue capacitance in roots than in leaves in these species.
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Claims 10
Claim · model-written summary
Drought caused leaf osmotic adjustment in all three oak species, lowering osmotic potentials by 0.25 to 0.60 MPa.
- Organ / stage
- leavese0
- Treatment
- Droughte0
- Outcome
- osmotic potential at full tissue hydration and at the turgor loss pointe0
- Direction
- decreasese0
- Value
- 0.25 to 0.60 MPae0
Not reportedTaxonComparator
Verbatim
e0“Drought resulted in active osmotic adjustment in leaves of all three species, with decreases in osmotic potential at full tissue hydration and at the turgor loss point from 0.25 to 0.60 MPa.”
Claim · model-written summary
Drought adjusted root osmotic potential in Q. stellata.
Verbatim
e0“Active osmotic adjustment in Q. stellata, and increased root tissue elasticity in Q. macrocarpa and Q. alba, resulted in turgor loss of roots occurring at a water potential 0.36 to 0.66 MPa lower in drought-stressed than in well-watered seedlings.”
Claim · model-written summary
Drought increased root tissue elasticity in Q. macrocarpa.
Not reportedTreatmentComparator
Verbatim
e0“increased root tissue elasticity in Q. macrocarpa and Q. alba”
Claim · model-written summary
Drought increased root tissue elasticity in Q. alba.
Not reportedTreatmentComparator
Verbatim
e0“increased root tissue elasticity in Q. macrocarpa and Q. alba”
Claim · model-written summary
Before drought, Q. stellata had lower osmotic potentials than Q. alba and Q. macrocarpa.
Verbatim
e0“Species differed in tissue water relations only before drought, with Q. stellata exhibiting lower osmotic potentials than Q. alba and Q. macrocarpa.”
Claim · model-written summary
At full saturation, leaf osmotic potential was generally below root osmotic potential.
Not reportedTaxon
Verbatim
e0“Estimates of the osmotic potential at full saturation were generally lower in leaves than in roots, but the osmotic potential at turgor loss was similar.”
Claim · model-written summary
Leaf and root osmotic potentials at turgor loss were similar.
Not reportedTaxon
Verbatim
e0“Estimates of the osmotic potential at full saturation were generally lower in leaves than in roots, but the osmotic potential at turgor loss was similar.”
Claim · model-written summary
Roots lost turgor at lower relative water content than leaves.
Not reportedTaxon
Verbatim
e0“Roots exhibited turgor loss at lower values of relative water content and experienced a more gradual decrease in water potential per unit water content during dehydration than did leaves.”
Claim · model-written summary
Root water potential fell more gradually with dehydration than leaf water potential.
- Organ / stage
- Rootse0
- Outcome
- water potential per unit water contente0
- Direction
- more gradual decreasee0
- Comparator
- leavese0
Not reportedTaxon
Verbatim
e0“Roots exhibited turgor loss at lower values of relative water content and experienced a more gradual decrease in water potential per unit water content during dehydration than did leaves.”
Claim · model-written summary
Roots had greater relative tissue capacitance than leaves.
Not reportedTaxon
Verbatim
e0“This response indicates greater relative tissue capacitance in roots than in leaves in these species.”