Abstract
The poplar clones Columbia River, Beaupre, Robusta and Raspalje have been investigated under the present (350 μmol mol−1) and double the present (700 μmol mol−1) atmospheric CO2 concentration. Cuttings were planted in pots and were grown in open-top chambers inside a glasshouse for 92 d. The number of leaves, total length of stem, total leaf area, overall growth rate, total leaf, stem and root d. wt responded positively to increased CO2 but the leaf size and biomass allocation showed no change with CO2 enrichment. Beaupre and Robusta showed a larger growth response than either Columbia River or Raspalje. The effects of CO2 enrichment were restricted to the early phase of growth at the beginning of the growth season. Leaf cell numbers in all the clones were not affected by CO2 enrichment. Leaf thickness was affected; this was mainly the result of larger mesophyll cells and more extensive intercellular spaces.
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Claims 8
Claim · model-written summary
CO2 enrichment increased leaf number, stem length and total leaf area.
- Treatment
- increased CO2e0
- Outcome
- number of leaves, total length of stem, total leaf areae0
- Direction
- responded positivelye0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of leaves, total length of stem, total leaf area, overall growth rate, total leaf, stem and root d. wt responded positively to increased CO2”
t0“Poplar”
Claim · model-written summary
CO2 enrichment increased growth rate and leaf and stem dry mass.
- Treatment
- increased CO2e0
- Outcome
- overall growth rate, total leaf, stem and root d. wte0
- Direction
- responded positivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overall growth rate, total leaf, stem and root d. wt responded positively to increased CO2”
t0“Poplar”
Claim · model-written summary
CO2 enrichment did not change leaf size.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf size and biomass allocation showed no change with CO2 enrichment”
t0“Poplar”
Claim · model-written summary
CO2 enrichment did not change biomass allocation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf size and biomass allocation showed no change with CO2 enrichment”
t0“Poplar”
Claim · model-written summary
Beaupre and Robusta had larger growth responses than Columbia River and Raspalje.
- Material
- Beaupre and Robustae0
- Outcome
- growth responsee0
- Direction
- largere0
- Comparator
- Columbia River or Raspaljee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Beaupre and Robusta showed a larger growth response than either Columbia River or Raspalje”
t0“Poplar”
Claim · model-written summary
CO2 effects were restricted to early seasonal growth.
- Outcome
- effects of CO2 enrichmente0
- Qualifier
- early phase of growth at the beginning of the growth seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of CO2 enrichment were restricted to the early phase of growth at the beginning of the growth season”
t0“Poplar”
Claim · model-written summary
CO2 enrichment did not affect leaf cell numbers.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf cell numbers in all the clones were not affected by CO2 enrichment”
t0“Poplar”
Claim · model-written summary
CO2 enrichment affected leaf thickness through larger mesophyll cells.
- Organ / stage
- mesophyll cellse0
- Outcome
- Leaf thicknesse0
- Qualifier
- larger mesophyll cells and more extensive intercellular spacese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf thickness was affected; this was mainly the result of larger mesophyll cells and more extensive intercellular spaces”
t0“Poplar”
The same questions in other papers
co2 · growth · Populus (poplar)Results differ
17 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- positive
15 papers more in this group
See all 19 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.