Abstract
Repeated progressive drought and flooding stress were imposed on hybrid poplar clones Populus × euramericana 'Eugenei', and Populus tristis × Populus balsamifera ‘Tristis’ grown in pots in a greenhouse under two nitrogen levels. In both clones the rate of leaf initiation was promoted only in high-N plants subjected to minimum water stress. Water stress alone did not retard the rate of leaf initiation, but it significantly reduced leaf expansion of 'Eugenei', whereas only flooding led to smaller leaves in 'Tristis'. The addition of N stimulated leaf expansion, leaf chlorophyll and N concentrations, and leaf and stem biomass production across soil moisture levels, but the greatest effect of N was associated with minimum water stress. High N altered carbon allocation towards the aboveground portions, leading to lower root to shoot ratios. High N also appeared to stimulate initiation of fine roots. Soil moisture determined the amount of biomass that accumulated in roots, with highest root production in well-watered pots and lowest in flooded pots, with the droughted treatment in between. Leaves became thinner as soil moisture decreased from flooding. Stem biomass of 'Tristis' declined more under flooding than under drought, whereas 'Eugenei' displayed a greater reduction of stem biomass in droughty than in flooded soil. Key words: water stress, nitrogen, leaf and root morphology, root to shoot ratio, biomass, Populus, flooding.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
High nitrogen and minimum water stress promoted leaf initiation in both clones.
Verbatim
e0“In both clones the rate of leaf initiation was promoted only in high-N plants subjected to minimum water stress”
Claim · model-written summary
Water stress alone did not retard leaf initiation.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress alone did not retard the rate of leaf initiation”
t0“hybrid Populus clones”
Claim · model-written summary
Water stress significantly reduced leaf expansion of Eugenei.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it significantly reduced leaf expansion of 'Eugenei'”
t0“hybrid Populus clones”
e1“Water stress alone did not retard the rate of leaf initiation, but it significantly reduced leaf expansion of”
Claim · model-written summary
Flooding produced smaller leaves in Tristis.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only flooding led to smaller leaves in 'Tristis'”
t0“hybrid Populus clones”
Claim · model-written summary
Nitrogen stimulated leaf expansion, chlorophyll and nitrogen concentrations, and leaf and stem biomass.
- Treatment
- addition of Ne0
- Outcome
- leaf expansion, leaf chlorophyll and N concentrationse0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of N stimulated leaf expansion, leaf chlorophyll and N concentrations, and leaf and stem biomass production across soil moisture levels”
t0“hybrid Populus clones”
Claim · model-written summary
The nitrogen effect was greatest under minimum water stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the greatest effect of N was associated with minimum water stress”
t0“hybrid Populus clones”
Claim · model-written summary
High nitrogen lowered root to shoot ratios.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N altered carbon allocation towards the aboveground portions, leading to lower root to shoot ratios”
t0“hybrid Populus clones”
Claim · model-written summary
High nitrogen appeared to stimulate fine root initiation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N also appeared to stimulate initiation of fine roots”
t0“hybrid Populus clones”
Claim · model-written summary
Root biomass production was highest in well-watered pots and lowest in flooded pots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest root production in well-watered pots and lowest in flooded pots, with the droughted treatment in between”
t0“hybrid Populus clones”
Claim · model-written summary
Leaves became thinner as soil moisture decreased from flooding.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves became thinner as soil moisture decreased from flooding”
t0“hybrid Populus clones”
Claim · model-written summary
Tristis stem biomass declined more under flooding than drought.
- Material
- 'Tristis'e0
- Treatment
- floodinge0
- Outcome
- Stem biomasse0
- Direction
- declined moree0
- Comparator
- droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem biomass of 'Tristis' declined more under flooding than under drought”
t0“hybrid Populus clones”
Claim · model-written summary
Eugenei stem biomass was reduced more under drought than flooding.
- Material
- 'Eugenei'e0
- Treatment
- droughtye0
- Outcome
- stem biomasse0
- Direction
- greater reductione0
- Comparator
- flooded soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Eugenei' displayed a greater reduction of stem biomass in droughty than in flooded soil”
t0“hybrid Populus clones”
The same questions in other papers
flooding · growth · Populus (poplar)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- positive
4 papers more in this group
See all 8 papers →drought · growth · Populus (poplar)Positive and negative results
15 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
14 papers more in this group
See all 18 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.