Abstract
Responses to successive drought and re-watering cycles (1-3 cycles) were compared in greenhouse-grown cuttings of Populus x canadensis (Moench) clones, 'Luisa_ Avanzo' and 'Dorskamp.' Total leaf number increment rate, duration of leaf expansion, total and individual leaf area expansion rates and stomatal conductance were recorded periodically during the experiment. Soil water content (SWC) and predawn leaf water potential (Psi(WP)) were measured four times during each drought cycle. In parallel, relative leaf water content (RWC) and specific leaf area (SLA) were estimated on leaves collected from the top to bottom of each cutting. Under well-watered conditions, 'Luisa_Avanzo' and 'Dorskamp' differed in their patterns of leaf area expansion. Although duration of leaf expansion was similar between clones, 'Luisa_ Avanzo' exhibited higher total leaf number increment rates and individual leaf area increases than 'Dorskamp.' As a result, 'Luisa_Avanzo' cuttings reached larger individual and total leaf areas than 'Dorskamp.' 'Dorskamp' leaves had lower SLA than 'Luisa_Avanzo' leaves. In response to successive drought cycles, both clones underwent decreases in total leaf number increment rates and in total leaf area expansion rates, but both whole-plant and individual leaf areas were drastically reduced only in 'Luisa_Avanzo.' 'Dorskamp' maintained a constant leaf area as a result of an increase in the duration of leaf expansion during drought and a significant stimulation of individual leaf area expansion rate and total leaf number increment rate in response to re-watering. Drought caused a greater decrease in SLA in 'Luisa_Avanzo' than in 'Dorskamp.' Expanded leaves of 'Dorskamp' were constitutively dense or thick, or both, whereas leaves of 'Luisa_Avanzo' became dense or thick, or both, only in response to drought. In both clones, re-watering caused partial recovery of SLA to control values. Our data confirm previous field and greenhouse observations that 'Dorskamp' is more tolerant to successive drought and re-watering cycles than 'Luisa_Avanzo.' We conclude that this difference is mainly attributable to the plasticity of 'Dorskamp' after re-watering, rather than to clonal differences in drought responses.
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Claims 19
Claim · model-written summary
The two clones differed in patterns of leaf area expansion under well-watered conditions.
- Taxon
- Populus x canadensis (Moench)
Populus ×canadensist0 - Material
- 'Luisa_Avanzo'e0
- Outcome
- patterns of leaf area expansione0
- Comparator
- 'Dorskamp'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under well-watered conditions, 'Luisa_Avanzo' and 'Dorskamp' differed in their patterns of leaf area expansion”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Leaf expansion duration was similar between clones.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Outcome
- duration of leaf expansione0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“duration of leaf expansion was similar between clones”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Luisa Avanzo had higher total leaf number increment rates than Dorskamp.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_ Avanzo'e0
- Outcome
- total leaf number increment ratese0
- Direction
- highere0
- Comparator
- 'Dorskamp.'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Luisa_ Avanzo' exhibited higher total leaf number increment rates and individual leaf area increases than 'Dorskamp.'”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Luisa Avanzo had higher individual leaf area increases than Dorskamp.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_ Avanzo'e0
- Outcome
- individual leaf area increasese0
- Direction
- highere0
- Comparator
- 'Dorskamp.'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Luisa_ Avanzo' exhibited higher total leaf number increment rates and individual leaf area increases than 'Dorskamp.'”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Luisa Avanzo cuttings reached larger individual and total leaf areas than Dorskamp.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_Avanzo'e0
- Outcome
- individual and total leaf arease0
- Direction
- largere0
- Comparator
- 'Dorskamp.'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Luisa_Avanzo' cuttings reached larger individual and total leaf areas than 'Dorskamp.'”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Dorskamp leaves had lower specific leaf area than Luisa Avanzo leaves.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e0
- Outcome
- SLAe0
- Direction
- lowere0
- Comparator
- 'Luisa_Avanzo'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Dorskamp' leaves had lower SLA than 'Luisa_Avanzo' leaves”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Successive drought cycles decreased total leaf number increment rates in both clones.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Treatment
- successive drought cyclese0
- Outcome
- total leaf number increment ratese0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response to successive drought cycles, both clones underwent decreases in total leaf number increment rates and in total leaf area expansion rates”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Successive drought cycles decreased total leaf area expansion rates in both clones.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Treatment
- successive drought cyclese0
- Outcome
- total leaf area expansion ratese0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response to successive drought cycles, both clones underwent decreases in total leaf number increment rates and in total leaf area expansion rates”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Whole-plant leaf area was drastically reduced only in Luisa Avanzo under repeated drought.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_Avanzo.'e0
- Treatment
- successive drought cyclese1
- Outcome
- whole-plante0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but both whole-plant and individual leaf areas were drastically reduced only in 'Luisa_Avanzo.'”
e1“In response to successive drought cycles”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Individual leaf area was drastically reduced only in Luisa Avanzo under repeated drought.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_Avanzo.'e0
- Treatment
- successive drought cyclese1
- Outcome
- individual leaf arease0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but both whole-plant and individual leaf areas were drastically reduced only in 'Luisa_Avanzo.'”
e1“In response to successive drought cycles”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Dorskamp maintained constant leaf area under drought.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e0
- Outcome
- leaf areae0
- Direction
- constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Dorskamp' maintained a constant leaf area”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Dorskamp increased the duration of leaf expansion during drought.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e1
- Treatment
- droughte0
- Outcome
- duration of leaf expansione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in the duration of leaf expansion during drought”
e1“'Dorskamp' maintained a constant leaf area”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Re-watering significantly stimulated individual leaf area expansion rate and total leaf number increment rate in Dorskamp.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e1
- Treatment
- re-wateringe0
- Outcome
- individual leaf area expansion rate and total leaf number increment ratee0
- Direction
- stimulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant stimulation of individual leaf area expansion rate and total leaf number increment rate in response to re-watering”
e1“'Dorskamp' maintained a constant leaf area”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Drought decreased specific leaf area more in Luisa Avanzo than in Dorskamp.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_Avanzo'e0
- Treatment
- Droughte0
- Outcome
- SLAe0
- Direction
- decreasee0
- Comparator
- 'Dorskamp.'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought caused a greater decrease in SLA in 'Luisa_Avanzo' than in 'Dorskamp.'”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Dorskamp expanded leaves were constitutively dense or thick.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e0
- Outcome
- constitutively dense or thicke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expanded leaves of 'Dorskamp' were constitutively dense or thick, or both”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Luisa Avanzo leaves became dense or thick only in response to drought.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Luisa_Avanzo'e0
- Treatment
- droughte0
- Outcome
- dense or thicke0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of 'Luisa_Avanzo' became dense or thick, or both, only in response to drought”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Re-watering partially restored specific leaf area toward control values in both clones.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Treatment
- re-wateringe0
- Outcome
- SLAe0
- Direction
- partial recoverye0
- Comparator
- control valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both clones, re-watering caused partial recovery of SLA to control values”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
Dorskamp was more tolerant of repeated drought and re-watering than Luisa Avanzo.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e0
- Outcome
- tolerante0
- Direction
- moree0
- Comparator
- 'Luisa_Avanzo.'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Dorskamp' is more tolerant to successive drought and re-watering cycles than 'Luisa_Avanzo.'”
t0“Populus x canadensis (Moench)”
Claim · model-written summary
The authors attribute the clone tolerance difference mainly to Dorskamp plasticity after re-watering.
- Taxon
- Populus x canadensis (Moench)Populus ×canadensist0
- Material
- 'Dorskamp'e0
- Outcome
- this differencee0
- Qualifier
- plasticitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this difference is mainly attributable to the plasticity of 'Dorskamp' after re-watering, rather than to clonal differences in drought responses”
t0“Populus x canadensis (Moench)”
The same questions in other papers
drought · growth · Populus x canadensis (hybrid black poplar)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
rewatering · growth · Populus x canadensis (hybrid black poplar)Results agree
1 paper in the same direction as this paper
- 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.