Abstract
Hydroponically cultivated Pinus pinaster Ait. seedlings of a drought-sensitive population from France (Landes) and of a more drought-adapted population from Morocco (Tamjoute) were subjected to a progressive increase in water stress by additions of an osmoticum (polyethylene glycol 600) to the nutrient solution. The final osmotic potential (Psi(ms)) of the nutrient solution was achieved over a period of up to 6 days, and ranged from -0.03 (control, no added osmoticum) to -0.8 MPa. In the 6 days during which water stress was imposed, roots elongated faster in the Moroccan provenance than in the French provenance, but the applied water deficits did not inhibit root elongation in either population. Among treatments, root dry weight per unit root length, total root dry weight and root/shoot dry weight ratio increased with decreasing Psi(ms) in both provenances. Both the water potential (Psi(w)) of the roots (apices) and the water potential difference between the roots and the nutrient solution decreased as Psi(ms) decreased. The reduction in Psi(w) was matched by a decrease of comparable magnitude in cell osmotic potential (Psi(pi)) so that root turgor was unaffected by the Psi(ms). Osmotic adjustment was greater, however, in the Moroccan provenance than in the French provenance. Consequently, under the osmotically imposed water stress, the water potential difference between root and nutrient solution was greater in the Moroccan provenance than in the French provenance. Similar changes in plant water relations were observed when seedlings were grown in drying sand.
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Claims 12
Claim · model-written summary
Roots elongated faster in the Moroccan provenance than the French provenance during imposed water stress.
- Taxon
- Pinus pinaster Ait.
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Pinus pinastert0 - Material
- Moroccan provenancee0
- Outcome
- roots elongatede0
- Direction
- fastere0
- Comparator
- French provenancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“roots elongated faster in the Moroccan provenance than in the French provenance”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Applied water deficits did not inhibit root elongation in either population.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Treatment
- applied water deficitse0
- Outcome
- root elongatione0
- Direction
- did not inhibite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the applied water deficits did not inhibit root elongation in either population”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Root dry weight per unit root length increased as nutrient solution osmotic potential decreased in both provenances.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- root dry weight per unit root lengthe0
- Direction
- increasede0
- Qualifier
- decreasing Psi(ms) in both provenancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry weight per unit root length, total root dry weight and root/shoot dry weight ratio increased with decreasing Psi(ms) in both provenances”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Total root dry weight increased as nutrient solution osmotic potential decreased in both provenances.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- total root dry weighte0
- Direction
- increasede0
- Qualifier
- decreasing Psi(ms) in both provenancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry weight per unit root length, total root dry weight and root/shoot dry weight ratio increased with decreasing Psi(ms) in both provenances”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Root to shoot dry weight ratio increased as nutrient solution osmotic potential decreased in both provenances.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- root/shoot dry weight ratioe0
- Direction
- increasede0
- Qualifier
- decreasing Psi(ms) in both provenancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry weight per unit root length, total root dry weight and root/shoot dry weight ratio increased with decreasing Psi(ms) in both provenances”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Root apex water potential decreased as solution osmotic potential decreased.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- water potential (Psi(w)) of the roots (apices)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the water potential (Psi(w)) of the roots (apices) and the water potential difference between the roots and the nutrient solution decreased as Psi(ms) decreased”
t0“Pinus pinaster Ait.”
Claim · model-written summary
The water potential difference between roots and nutrient solution decreased as solution osmotic potential decreased.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- water potential difference between the roots and the nutrient solutione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the water potential (Psi(w)) of the roots (apices) and the water potential difference between the roots and the nutrient solution decreased as Psi(ms) decreased”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Cell osmotic potential decreased comparably to root water potential.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- cell osmotic potential (Psi(pi))e0
- Direction
- decreasee0
- Qualifier
- comparable magnitudee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in Psi(w) was matched by a decrease of comparable magnitude in cell osmotic potential (Psi(pi))”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Root turgor was unaffected by solution osmotic potential.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Outcome
- root turgore0
- Direction
- unaffectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root turgor was unaffected by the Psi(ms)”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Osmotic adjustment was greater in the Moroccan than French provenance.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Material
- Moroccan provenancee0
- Outcome
- Osmotic adjustmente0
- Direction
- greatere0
- Comparator
- French provenancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic adjustment was greater, however, in the Moroccan provenance than in the French provenance”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Under imposed water stress, the root to nutrient solution water potential difference was greater in the Moroccan than French provenance.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Material
- Moroccan provenancee0
- Outcome
- water potential difference between root and nutrient solutione0
- Direction
- greatere0
- Comparator
- French provenancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the osmotically imposed water stress, the water potential difference between root and nutrient solution was greater in the Moroccan provenance than in the French provenance”
t0“Pinus pinaster Ait.”
Claim · model-written summary
Seedlings grown in drying sand showed similar changes in plant water relations.
- Taxon
- Pinus pinaster Ait.Pinus pinastert0
- Treatment
- drying sande0
- Outcome
- changes in plant water relationse0
- Direction
- Similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar changes in plant water relations were observed when seedlings were grown in drying sand”
t0“Pinus pinaster Ait.”