Abstract
SUMMARY Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae. They were pulse‐fed with 14 CO 2 in an apparatus which allowed CO 2 subsequently respired either by the shoots or by the roots plus soil to be separately monitored. There were three experiments. In two, plants were harvested 48 h after labelling and in the third after 214 h. At harvest, the distribution of 14 C between shoot, root, soil organic matter and root washings was measured. Similar growth curves for M and NM plants were obtained by supplying extra phosphorus to the latter, so that C distributions for both treatments could be compared directly. In all three experiments, about 7 % more of the total fixed C was translocated from shoot to root in M plants compared to NM plants. In the third experiment, this extra translocate could be accounted for by increased root respiration plus increased loss of C to the soil but, despite this drain, M and NM plants had equal rates of C assimilation per unit of leaf area. However, shoots of M plants had a lower content of dry matter and hence higher assimilation rates expressed on a dry matter basis. Increased hydration is suggested as a mechanism whereby leaf area and hence C assimilation increases in mycorrhizal plants and which offsets the effects of the drain imposed by the mycorrhizas.
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Claims 7
Claim · model-written summary
Mycorrhizal leek translocated about seven percent more fixed carbon from shoots to roots than nonmycorrhizal leek.
- Taxon
- Leek
Allium ampeloprasume1 - Treatment
- inoculated (M)e1
- Interactor
- Glomus mosseae
Funneliformis mosseaee1symbiont - Outcome
- total fixed C was translocated from shoot to roote0
- Direction
- moree0
- Value
- 7 %e0
- Comparator
- NM plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“about 7 % more of the total fixed C was translocated from shoot to root in M plants compared to NM plants.”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
Claim · model-written summary
In the third experiment the additional translocate was accounted for by increased root respiration.
- Taxon
- LeekAllium ampeloprasume1
- Treatment
- inoculated (M)e1
- Interactor
- Glomus mosseaeFunneliformis mosseaee1symbiont
- Outcome
- root respiratione0
- Direction
- increasede0
- Comparator
- not (NM)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this extra translocate could be accounted for by increased root respiration plus increased loss of C to the soil”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
Claim · model-written summary
In the third experiment the additional translocate was also accounted for by greater carbon loss to soil.
- Taxon
- LeekAllium ampeloprasume1
- Treatment
- inoculated (M)e1
- Interactor
- Glomus mosseaeFunneliformis mosseaee1symbiont
- Outcome
- loss of C to the soile0
- Direction
- increasede0
- Comparator
- not (NM)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this extra translocate could be accounted for by increased root respiration plus increased loss of C to the soil”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
Claim · model-written summary
Mycorrhizal and nonmycorrhizal plants had equal carbon assimilation rates per leaf area.
- Taxon
- LeekAllium ampeloprasume1
- Treatment
- inoculated (M)e1
- Interactor
- Glomus mosseaeFunneliformis mosseaee1symbiont
- Outcome
- rates of C assimilation per unit of leaf areae0
- Direction
- equale0
- Comparator
- NM plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“M and NM plants had equal rates of C assimilation per unit of leaf area.”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
Claim · model-written summary
Mycorrhizal shoots had lower dry matter content.
- Taxon
- LeekAllium ampeloprasume1
- Treatment
- inoculated (M)e1
- Interactor
- Glomus mosseaeFunneliformis mosseaee1symbiont
- Outcome
- content of dry mattere0
- Direction
- lowere0
- Comparator
- not (NM)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoots of M plants had a lower content of dry matter”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
Claim · model-written summary
Mycorrhizal plants had higher carbon assimilation per unit dry matter.
- Taxon
- LeekAllium ampeloprasume1
- Treatment
- inoculated (M)e1
- Interactor
- Glomus mosseaeFunneliformis mosseaee1symbiont
- Outcome
- assimilation rates expressed on a dry matter basise0
- Direction
- highere0
- Comparator
- not (NM)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher assimilation rates expressed on a dry matter basis.”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
Claim · model-written summary
The authors proposed that increased hydration raises leaf area and assimilation, offsetting the mycorrhizal carbon drain.
- Taxon
- LeekAllium ampeloprasume1
- Interactor
- Glomus mosseaeFunneliformis mosseaee1symbiont
- Outcome
- C assimilation increasese0
- Qualifier
- Increased hydratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased hydration is suggested as a mechanism whereby leaf area and hence C assimilation increases in mycorrhizal plants and which offsets the effects of the drain imposed by the mycorrhizas.”
e1“Leek plants (Allium porrum) were grown on partially sterilized soil either inoculated (M) or not (NM) with the vesicular‐arbuscular mycorrhizal fungus, Glomus mosseae.”
The same questions in other papers
inoculation · Funneliformis mosseae · Allium ampeloprasum (leek)Results agree
2 papers in the same direction as this paper
- positive
- 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.