Abstract
The influence of irradiance and drought on osmotic and turgor adjustment was examined in leaves of rose (Rosa hybrida L. `Samantha'). Plants cultured under full ambient light in the greenhouse were placed in shade chambers and, after 2 weeks of acclimation, exposed to drought for 21 days. Treatments consisted of a water stress factor (well-watered and drought-stressed) and an irradiance factor (100%, 70%, and 30% of ambient irradiance). Pressure-volume analyses of leaves indicated that osmotic potentials at full turgor were decreased 0.42, 0.36, and 0.23 MPa by drought in the 100%, 70%, and 30% irradiance treatments, respectively. Plants stressed under 100% and 70% irradiance exhibited similar osmotic adjustments. Plants under 30% irradiance had higher osmotic potentials at full turgor under well-watered conditions than plants in the other two irradiance treatments and showed only 55% as much adjustment to drought. In each irradiance treatment, drought induced an increase in elastic modulus and a decrease in relative water content at zero turgor. Turgor pressures were higher across a range of relative water contents in plants in the two higher irradiance treatments under both soil moisture treatments. Turgor also was higher at any particular water potential at 100% and 70% irradiance than 30% irradiance, within each soil moisture treatment. Heavy, but not mild, shading inhibited osmotic and turgor adjustments in leaves during drought.
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Claims 8
Claim · model-written summary
Drought decreased osmotic potential at full turgor in rose leaves, by 0.42, 0.36 and 0.23 MPa at 100%, 70% and 30% irradiance.
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e1“osmotic potentials at full turgor were decreased 0.42, 0.36, and 0.23 MPa by drought in the 100%, 70%, and 30% irradiance treatments”
e2“Treatments consisted of a water stress factor (well-watered and drought-stressed)”
Claim · model-written summary
Plants under 100% and 70% irradiance showed similar osmotic adjustment to drought.
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e3“Plants stressed under 100% and 70% irradiance exhibited similar osmotic adjustments”
Claim · model-written summary
Under well-watered conditions, plants at 30% irradiance had higher osmotic potential at full turgor than at the other two irradiance levels.
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e4“Plants under 30% irradiance had higher osmotic potentials at full turgor under well-watered conditions than plants in the other two irradiance treatments”
Claim · model-written summary
Plants at 30% irradiance showed only 55% as much osmotic adjustment to drought.
- Taxon
- rosee0
- Treatment
- 30% irradiancee4
- Outcome
- adjustment to droughte5
- Direction
- only 55% as muche5
- Value
- 55%e5
Not reportedComparator
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e4“Plants under 30% irradiance had higher osmotic potentials at full turgor under well-watered conditions than plants in the other two irradiance treatments”
e5“showed only 55% as much adjustment to drought”
Claim · model-written summary
Drought increased the elastic modulus of rose leaves in each irradiance treatment.
Not reportedComparator
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e6“drought induced an increase in elastic modulus and a decrease in relative water content at zero turgor”
Claim · model-written summary
Drought decreased the relative water content at zero turgor of rose leaves in each irradiance treatment.
Not reportedComparator
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e6“drought induced an increase in elastic modulus and a decrease in relative water content at zero turgor”
Claim · model-written summary
Turgor pressure was higher across a range of relative water contents at 100% and 70% irradiance than at 30% irradiance.
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e1“Turgor pressures were higher across a range of relative water contents in plants in the two higher irradiance treatments under both soil moisture treatments”
e2“Turgor also was higher at any particular water potential at 100% and 70% irradiance than 30% irradiance”
Claim · model-written summary
Heavy but not mild shading inhibited osmotic and turgor adjustment in rose leaves during drought.
Verbatim
e0“examined in leaves of rose (Rosa hybrida L. `Samantha')”
e1“Heavy, but not mild, shading inhibited osmotic and turgor adjustments in leaves during drought”
The same questions in other papers
light · physiology: water · RosaPositive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.