Abstract
ABSTRACT The effect of elevated atmospheric CO 2 concentration on the growth of shoots, roots, mycorrhizas and extraradical mycorrhizal mycelia of pine ( Pinus silvestris L.) was examined. Two and a half‐month‐old seedlings were inoculated axenically with the mycorrhizal fungus Pisolithus tincto‐rius (Pers.) by a method allowing rapid mycorrhiza formation in Petri dishes. The plants were then cultivated for 3 months in growth chambers with daily concentrations of 350 and 600 μmol mol −1 CO 2 during the day. Whereas plants harvested after 1 and 2 months did not differ appreciably between ambient and increased CO 2 concentrations, after 3 months they developed a considerably higher root biomass (%57%) at elevated CO 2 , but did not increase significantly in root length. The mycorrhizal fungus Pisolithus tinctorius , which depended entirely on the plant assimilates in the model system, grew much faster at increased CO 2 : 3 times more mycorrhizal root clusters were formed and the extraradical mycelium produced had twice the biomass at elevated as at ambient CO 2 . No difference in shoot biomass was found between the two treatments after 91 d. However, since the total water consumption of seedlings was similar in the two treatments, the water use efficiency was appreciably higher for the seedlings at increased CO 2 because of the higher below‐ground biomass.
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Claims 8
Claim · model-written summary
Pine seedlings showed no appreciable treatment difference at one and two months.
- Treatment
- increased CO 2 concentrationse0
- Outcome
- plants harvested after 1 and 2 monthse0
- Direction
- did not differ appreciablye0
- Comparator
- ambiente0
PinusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants harvested after 1 and 2 months did not differ appreciably between ambient and increased CO 2 concentrations”
t0“pine”
Claim · model-written summary
Elevated CO2 increased pine root biomass by 57% after three months.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after 3 months they developed a considerably higher root biomass (%57%) at elevated CO 2”
t0“pine”
Claim · model-written summary
Elevated CO2 did not significantly increase pine root length.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at elevated CO 2 , but did not increase significantly in root length”
t0“pine”
Claim · model-written summary
Elevated CO2 tripled pine mycorrhizal root clusters.
- Treatment
- elevatede0
- Interactor
- Pisolithus tinctorius
Pisolithus tinctoriuse1symbiont - Outcome
- mycorrhizal root clusterse0
- Direction
- moree0
- Value
- 3 timese0
- Comparator
- ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3 times more mycorrhizal root clusters were formed and the extraradical mycelium produced had twice the biomass at elevated as at ambient CO 2”
t0“pine”
e1“The mycorrhizal fungus Pisolithus tinctorius”
Claim · model-written summary
Elevated CO2 doubled extraradical mycelial biomass.
- Treatment
- elevatede0
- Interactor
- Pisolithus tinctoriusPisolithus tinctoriuse1symbiont
- Outcome
- extraradical mycelium producede0
- Direction
- moree0
- Value
- twicee0
- Comparator
- ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3 times more mycorrhizal root clusters were formed and the extraradical mycelium produced had twice the biomass at elevated as at ambient CO 2”
t0“pine”
e1“The mycorrhizal fungus Pisolithus tinctorius”
Claim · model-written summary
Shoot biomass did not differ between CO2 treatments after 91 days.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No difference in shoot biomass was found between the two treatments after 91 d”
t0“pine”
Claim · model-written summary
Seedling total water consumption was similar between treatments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the total water consumption of seedlings was similar in the two treatments”
t0“pine”
Claim · model-written summary
Elevated CO2 increased water use efficiency because below-ground biomass increased.
- Treatment
- increased CO 2e0
- Outcome
- water use efficiencye0
- Direction
- highere0
- Qualifier
- higher below‐ground biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the water use efficiency was appreciably higher for the seedlings at increased CO 2 because of the higher below‐ground biomass”
t0“pine”
The same questions in other papers
co2 · growth · PinusPositive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- no effect
- no effect
7 papers more in this group
See all 11 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.