Abstract
Effects of N and K nutrition on drought and cavitation resistance were examined in six greenhouse-grown poplar clones: Populus trichocarpa (Torr. & Gray) and its hybrids with P. deltoides Bartr. and P. euramericana (Dole) Guinier, before and after preconditioning to water stress. Both tendency to cavitate and water-use efficiency (WUE) increased when N supply was increased, whereas K supply had little impact on cavitation. Mean xylem vessel diameters increased from 36.6 &mgr;m at low-N supply to 45.2 &mgr;m at high-N supply. Drought-hardy clones, which were relatively resistant to cavitation, had the smallest mean vessel diameters. Vulnerability to cavitation had a weakly positive relationship with vessel diameter, and a negative correlation with transpiration. Drought hardening offered no protection against cavitation in a subsequent drought. Under drought conditions, increasing N supply increased leaf loss and decreased water potentials, whereas increasing K supply decreased leaf loss. Drought-resistant clones exhibited similar WUE to drought-susceptible clones, but had smaller, more numerous stomata and greater leaf retention under drought conditions.
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Claims 15
Claim · model-written summary
Increasing N supply increased the tendency of poplars to cavitate.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e1“Both tendency to cavitate and water-use efficiency (WUE) increased when N supply was increased, whereas K supply had little impact on cavitation”
Claim · model-written summary
Increasing N supply increased water-use efficiency of poplars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e1“Both tendency to cavitate and water-use efficiency (WUE) increased when N supply was increased, whereas K supply had little impact on cavitation”
Claim · model-written summary
Increasing K supply had little impact on cavitation in poplars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e1“Both tendency to cavitate and water-use efficiency (WUE) increased when N supply was increased, whereas K supply had little impact on cavitation”
Claim · model-written summary
High N supply increased mean xylem vessel diameter in poplars compared with low N supply.
- Treatment
- high-N supplye2
- Outcome
- Mean xylem vessel diameterse2
- Direction
- increasede2
- Value
- 45.2 &mgr;me2
- Comparator
- low-N supplye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e2“Mean xylem vessel diameters increased from 36.6 &mgr;m at low-N supply to 45.2 &mgr;m at high-N supply”
Claim · model-written summary
Drought-hardy poplar clones had the smallest mean vessel diameters.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e3“Drought-hardy clones, which were relatively resistant to cavitation, had the smallest mean vessel diameters”
Claim · model-written summary
Vulnerability to cavitation had a weakly positive relationship with vessel diameter in poplars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e4“Vulnerability to cavitation had a weakly positive relationship with vessel diameter, and a negative correlation with transpiration”
Claim · model-written summary
Vulnerability to cavitation had a negative correlation with transpiration in poplars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e4“Vulnerability to cavitation had a weakly positive relationship with vessel diameter, and a negative correlation with transpiration”
Claim · model-written summary
Drought hardening gave no protection against cavitation in a subsequent drought.
- Treatment
- Drought hardeninge5
- Outcome
- protection against cavitatione5
- Direction
- no_changeinferrede5
- Qualifier
- in a subsequent droughte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e5“Drought hardening offered no protection against cavitation in a subsequent drought”
Claim · model-written summary
Under drought, increasing N supply increased leaf loss in poplars.
- Treatment
- increasing N supplye6
- Outcome
- leaf losse6
- Direction
- increasede6
- Qualifier
- Under drought conditionse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e6“Under drought conditions, increasing N supply increased leaf loss and decreased water potentials, whereas increasing K supply decreased leaf loss”
Claim · model-written summary
Under drought, increasing N supply decreased water potentials in poplars.
- Treatment
- increasing N supplye6
- Outcome
- water potentialse6
- Direction
- decreasede6
- Qualifier
- Under drought conditionse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e6“Under drought conditions, increasing N supply increased leaf loss and decreased water potentials, whereas increasing K supply decreased leaf loss”
Claim · model-written summary
Under drought, increasing K supply decreased leaf loss in poplars.
- Treatment
- increasing K supplye6
- Outcome
- leaf losse6
- Direction
- decreasede6
- Qualifier
- Under drought conditionse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e6“Under drought conditions, increasing N supply increased leaf loss and decreased water potentials, whereas increasing K supply decreased leaf loss”
Claim · model-written summary
Drought-resistant poplar clones had water-use efficiency similar to drought-susceptible clones.
- Material
- Drought-resistant clonese7
- Outcome
- WUEe7
- Direction
- no_changeinferrede7
- Comparator
- drought-susceptible clonese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e7“Drought-resistant clones exhibited similar WUE to drought-susceptible clones, but had smaller, more numerous stomata and greater leaf retention under drought conditions”
Claim · model-written summary
Drought-resistant poplar clones had smaller stomata.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e7“Drought-resistant clones exhibited similar WUE to drought-susceptible clones, but had smaller, more numerous stomata and greater leaf retention under drought conditions”
Claim · model-written summary
Drought-resistant poplar clones had more numerous stomata.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e7“Drought-resistant clones exhibited similar WUE to drought-susceptible clones, but had smaller, more numerous stomata and greater leaf retention under drought conditions”
Claim · model-written summary
Drought-resistant poplar clones retained more leaves under drought conditions.
- Material
- Drought-resistant clonese7
- Outcome
- leaf retentione7
- Direction
- greatere7
- Qualifier
- under drought conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplars”
e7“Drought-resistant clones exhibited similar WUE to drought-susceptible clones, but had smaller, more numerous stomata and greater leaf retention under drought conditions”
The same questions in other papers
drought · control · Populus (poplar)Positive and negative results
1 in the opposite direction
- positive
nitrogen · physiology: water · Populus (poplar)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- 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.