Abstract
To study the effects of water-deficit stress on root water flow properties in trembling aspen (Populus tremuloides Michx.), seedlings were grown in solution culture and subjected to water-deficit stress by placing their roots in sealed high humidity chambers. After 17 h of stress treatment, seedlings showed mild stress (MS) symptoms with a decline in shoot water potentials. Within 20 h, shoot water potentials rapidly declined, and severe stress (SS) symptoms were present. Root hydraulic conductivity (L(pr)) increased more than two-fold and the relative concentration of apoplastic tracer dye trisodium 3-hydroxy-5, 8, 10-pyrenetrisulphonate (PTS(3)) in xylem exudate decreased by 73.6% in MS seedlings. Conversely, L(pr) decreased (55.3%) and PTS(3) increased (28.6%) in SS seedlings. Treatment of roots with 0.1 mM mercuric chloride decreased root volume flow density (J(v)) by about 29.0% in control and MS plants with no decrease measured in SS seedlings. Mercuric chloride also increased PTS(3) concentration in xylem exudate of control (59%) and MS (86%) seedlings with no change observed in SS plants. The results suggest that aquaporin-mediated transport is important in the regulation of root water flow under drought stress and that root water flow properties are strongly affected by the stress level. Regulation of root water flow may represent an important drought-stress resistance mechanism.
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Claims 14
Claim · model-written summary
After 17 hours of water deficit, seedlings had mild stress symptoms and declining shoot water potentials.
- Taxon
- Populus tremuloides Michx.
Populus tremuloidese1 - Treatment
- water-deficit stresse1
- Outcome
- shoot water potentialse0
- Direction
- declinee0
- Qualifier
- After 17 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 17 h of stress treatment, seedlings showed mild stress (MS) symptoms with a decline in shoot water potentials”
e1“water-deficit stress on root water flow properties in trembling aspen (Populus tremuloides Michx.)”
Claim · model-written summary
Within 20 hours, shoot water potentials rapidly declined and severe stress symptoms appeared.
- Taxon
- Populus tremuloides Michx.Populus tremuloidese1
- Treatment
- water-deficit stresse1
- Outcome
- shoot water potentialse0
- Direction
- declinede0
- Qualifier
- Within 20 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within 20 h, shoot water potentials rapidly declined, and severe stress (SS) symptoms were present”
e1“water-deficit stress on root water flow properties in trembling aspen (Populus tremuloides Michx.)”
Claim · model-written summary
Mildly stressed seedlings had more than two-fold higher root hydraulic conductivity.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- MSe0
- Outcome
- Root hydraulic conductivity (L(pr))e0
- Direction
- increasede0
- Value
- more than two-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root hydraulic conductivity (L(pr)) increased more than two-fold and the relative concentration of apoplastic tracer dye trisodium 3-hydroxy-5, 8, 10-pyrenetrisulphonate (PTS(3)) in xylem exudate decreased by 73.6% in MS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Mild stress decreased relative apoplastic tracer concentration in xylem exudate by 73.6%.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Organ / stage
- xylem exudatee0
- Treatment
- MSe0
- Outcome
- relative concentration of apoplastic tracer dye trisodium 3-hydroxy-5, 8, 10-pyrenetrisulphonate (PTS(3))e0
- Direction
- decreasede0
- Value
- 73.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative concentration of apoplastic tracer dye trisodium 3-hydroxy-5, 8, 10-pyrenetrisulphonate (PTS(3)) in xylem exudate decreased by 73.6% in MS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Severe stress decreased root hydraulic conductivity by 55.3%.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- SSe0
- Outcome
- L(pr)e0
- Direction
- decreasede0
- Value
- 55.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conversely, L(pr) decreased (55.3%) and PTS(3) increased (28.6%) in SS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Severe stress increased tracer concentration by 28.6%.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- SSe0
- Outcome
- PTS(3)e0
- Direction
- increasede0
- Value
- 28.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conversely, L(pr) decreased (55.3%) and PTS(3) increased (28.6%) in SS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Mercuric chloride decreased root volume flow density by about 29.0% in control plants.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- 0.1 mM mercuric chloridee0
- Outcome
- root volume flow density (J(v))e0
- Direction
- decreasede0
- Value
- about 29.0%e0
- Qualifier
- controle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of roots with 0.1 mM mercuric chloride decreased root volume flow density (J(v)) by about 29.0% in control and MS plants with no decrease measured in SS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Mercuric chloride decreased root volume flow density by about 29.0% in mild-stress plants.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- 0.1 mM mercuric chloridee0
- Outcome
- root volume flow density (J(v))e0
- Direction
- decreasede0
- Value
- about 29.0%e0
- Qualifier
- MSe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of roots with 0.1 mM mercuric chloride decreased root volume flow density (J(v)) by about 29.0% in control and MS plants with no decrease measured in SS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Mercuric chloride did not decrease root volume flow density in severe-stress seedlings.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- 0.1 mM mercuric chloridee0
- Outcome
- root volume flow density (J(v))e0
- Direction
- no decreasee0
- Qualifier
- SSe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of roots with 0.1 mM mercuric chloride decreased root volume flow density (J(v)) by about 29.0% in control and MS plants with no decrease measured in SS seedlings”
t0“Populus tremuloides”
Claim · model-written summary
Mercuric chloride increased tracer concentration in control seedling xylem exudate by 59%.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Organ / stage
- xylem exudatee0
- Treatment
- Mercuric chloridee0
- Outcome
- PTS(3) concentratione0
- Direction
- increasede0
- Value
- 59%e0
- Qualifier
- controle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mercuric chloride also increased PTS(3) concentration in xylem exudate of control (59%) and MS (86%) seedlings with no change observed in SS plants”
t0“Populus tremuloides”
Claim · model-written summary
Mercuric chloride increased tracer concentration in mild-stress seedling xylem exudate by 86%.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Organ / stage
- xylem exudatee0
- Treatment
- Mercuric chloridee0
- Outcome
- PTS(3) concentratione0
- Direction
- increasede0
- Value
- 86%e0
- Qualifier
- MSe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mercuric chloride also increased PTS(3) concentration in xylem exudate of control (59%) and MS (86%) seedlings with no change observed in SS plants”
t0“Populus tremuloides”
Claim · model-written summary
Mercuric chloride did not change tracer concentration in severe-stress plants.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- Mercuric chloridee0
- Outcome
- PTS(3) concentratione0
- Direction
- no changee0
- Qualifier
- SSe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mercuric chloride also increased PTS(3) concentration in xylem exudate of control (59%) and MS (86%) seedlings with no change observed in SS plants”
t0“Populus tremuloides”
Claim · model-written summary
Aquaporin-mediated transport is suggested to regulate root water flow under drought stress.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Treatment
- drought stresse0
- Outcome
- regulation of root water flowe0
- Qualifier
- aquaporin-mediated transporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that aquaporin-mediated transport is important in the regulation of root water flow under drought stress”
t0“Populus tremuloides”
Claim · model-written summary
Root water flow regulation may be an important drought resistance mechanism.
- Taxon
- Populus tremuloidesPopulus tremuloidest0
- Outcome
- drought-stress resistancee0
- Qualifier
- Regulation of root water flowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regulation of root water flow may represent an important drought-stress resistance mechanism”
t0“Populus tremuloides”