Abstract
Organic solute concentrations of five hybrid poplar cultivars were compared to determine the relationship between water-stress tolerance, tissue solute concentration, and growth rate under field conditions. In the expanding foliage of the faster growing Populus deltoides Bartr. × P. balsamifera L. (Jackii 4), the saturated osmotic potential and turgor loss point osmotic potential were 0.18 MPa and 0.47 MPa lower, respectively, than in the slower growing P. deltoides × P. balsamifera (Jackii 7). The expanding foliage of Jackii 4 had higher (ca. 50%) concentrations of organic solutes, attributable mainly to salicyl alcohol, salicin, sucrose, and an unidentified compound. The coupling of high productivity and stress tolerance in Jackii 4 suggests that these may be compatible rather than competing attributes. Water-stress studies on P. deltoides Bartr. × P. nigra L. (DN 22) under greenhouse conditions demonstrated that stressed trees accumulated 4 times the soluble sugar concentrations of well-watered trees, lowering the saturated osmotic potential by 0.55 MPa and turgor loss point osmotic potential by 1.0 MPa. Leaves were the primary site of osmotic adjustment to water stress and roots showed no adjustment. The use of repeated drying cycles in planting stock may aid survival of postplanting stress in species capable of osmotic adjustment. The relationship between stress tolerance and solute concentrations in the greenhouse water-stress study paralleled that of the field study.
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Claims 10
Claim · model-written summary
Jackii 4 saturated osmotic potential was 0.18 MPa lower than Jackii 7.
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the saturated osmotic potential and turgor loss point osmotic potential were 0.18 MPa and 0.47 MPa lower, respectively, than in the slower growing P. deltoides × P. balsamifera (Jackii 7).”
t0“hybrid poplar”
Claim · model-written summary
Jackii 4 turgor loss point osmotic potential was 0.47 MPa lower than Jackii 7.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the saturated osmotic potential and turgor loss point osmotic potential were 0.18 MPa and 0.47 MPa lower, respectively, than in the slower growing P. deltoides × P. balsamifera (Jackii 7).”
t0“hybrid poplar”
Claim · model-written summary
Jackii 4 expanding foliage had about 50% higher organic solute concentrations.
- Material
- Jackii 4e0
- Organ / stage
- expanding foliagee0
- Outcome
- concentrations of organic solutese0
- Direction
- highere0
- Value
- ca. 50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expanding foliage of Jackii 4 had higher (ca. 50%) concentrations of organic solutes, attributable mainly to salicyl alcohol, salicin, sucrose, and an unidentified compound.”
t0“hybrid poplar”
Claim · model-written summary
Jackii 4 organic solutes were attributed mainly to salicyl alcohol, salicin, sucrose and an unidentified compound.
- Outcome
- salicyl alcohol, salicin, sucrose, and an unidentified compounde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentrations of organic solutes, attributable mainly to salicyl alcohol, salicin, sucrose, and an unidentified compound.”
t0“hybrid poplar”
Claim · model-written summary
Stressed DN 22 trees accumulated four times the soluble sugars of well watered trees.
- Treatment
- stressed treese0
- Outcome
- soluble sugar concentrationse0
- Direction
- accumulatede0
- Value
- 4 timese0
- Comparator
- well-watered treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stressed trees accumulated 4 times the soluble sugar concentrations of well-watered trees”
t0“hybrid poplar”
Claim · model-written summary
Water stress lowered DN 22 saturated osmotic potential by 0.55 MPa.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lowering the saturated osmotic potential by 0.55 MPa and turgor loss point osmotic potential by 1.0 MPa.”
t0“Water-stress tolerance and late-season organic solute accumulation in hybrid poplar”
Claim · model-written summary
Water stress lowered DN 22 turgor loss point osmotic potential by 1.0 MPa.
- Treatment
- Water-stresst0
- Outcome
- turgor loss point osmotic potentiale0
- Direction
- loweringe0
- Value
- 1.0 MPae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lowering the saturated osmotic potential by 0.55 MPa and turgor loss point osmotic potential by 1.0 MPa.”
t0“Water-stress tolerance and late-season organic solute accumulation in hybrid poplar”
Claim · model-written summary
Leaves were the main site of osmotic adjustment under water stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves were the primary site of osmotic adjustment to water stress and roots showed no adjustment.”
t0“hybrid poplar”
Claim · model-written summary
Roots showed no osmotic adjustment under water stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves were the primary site of osmotic adjustment to water stress and roots showed no adjustment.”
t0“hybrid poplar”
Claim · model-written summary
The greenhouse relation between tolerance and solutes paralleled the field relation.
- Outcome
- relationship between stress tolerance and solute concentrationse0
- Comparator
- field studye0
- Setting
- greenhousee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between stress tolerance and solute concentrations in the greenhouse water-stress study paralleled that of the field study.”
t0“hybrid poplar”
The same questions in other papers
drought · physiology: water · Populus (poplar)Positive and negative results
3 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- negative
5 papers more in this group
See all 9 papers →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.