Abstract
Effects of the arbuscular mycorrhizal fungus (AMF) Glomus hoi on the carbon economy of perennial ryegrass (Lolium perenne) were investigated by comparing nonmycorrhizal and mycorrhizal plants of the same size, morphology and phosphorus status. Plants were grown in the presence of CO2 sources with different C isotope composition (delta13C -1 or -44). Relative respiration and gross photosynthesis rates, and belowground allocation of C assimilated during one light period ('new C'), as well as its contribution to respiration, were quantified by the concerted use of 13CO2/12CO2 steady-state labelling and 13CO2/12CO2 gas-exchange techniques. AMF (G. hoi) enhanced the relative respiration rate of the root + soil system by 16%, inducing an extra C flow amounting to 3% of daily gross photosynthesis. Total C flow into AMF growth and respiration was estimated at < 8% of daily gross photosynthesis. This was associated with a greater amount of new C allocated belowground and respired in mycorrhizal plants. AMF colonization affected the sources supplying belowground respiration, indicating a greater importance of plant C stores in supplying respiration and/or the participation of storage pools within fungal tissues. When ontogenetic and nutritional effects were accounted for, AMF increased belowground C costs, which were not compensated by increased photosynthesis rates. Therefore the instantaneous relative growth rate was lower in mycorrhizal plants.
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Claims 8
Claim · model-written summary
AMF increased root and soil relative respiration by 16%.
- Taxon
- perennial ryegrass
Lolium perennet0 - Treatment
- AMF (G. hoi)e0
- Interactor
- G. hoiGlomus hoie0symbiont
- Outcome
- relative respiration rate of the root + soil systeme0
- Direction
- enhancede0
- Value
- 16%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AMF (G. hoi) enhanced the relative respiration rate of the root + soil system by 16%, inducing an extra C flow amounting to 3% of daily gross photosynthesis.”
t0“perennial ryegrass”
Claim · model-written summary
AMF induced extra carbon flow equal to 3% of daily gross photosynthesis.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- AMF (G. hoi)e0
- Interactor
- G. hoiGlomus hoie0symbiont
- Outcome
- extra C flowe0
- Direction
- inducinge0
- Value
- 3% of daily gross photosynthesise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AMF (G. hoi) enhanced the relative respiration rate of the root + soil system by 16%, inducing an extra C flow amounting to 3% of daily gross photosynthesis.”
t0“perennial ryegrass”
Claim · model-written summary
Total carbon flow into AMF growth and respiration was below 8% of daily gross photosynthesis.
- Taxon
- perennial ryegrassLolium perennet0
- Interactor
- AMFe0symbiont
- Outcome
- Total C flow into AMF growth and respiratione0
- Value
- < 8% of daily gross photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total C flow into AMF growth and respiration was estimated at < 8% of daily gross photosynthesis.”
t0“perennial ryegrass”
Claim · model-written summary
Mycorrhizal plants allocated and respired more newly assimilated carbon belowground.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- mycorrhizal plantse0
- Interactor
- AMFe1symbiont
- Outcome
- new C allocated belowground and respirede0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was associated with a greater amount of new C allocated belowground and respired in mycorrhizal plants.”
t0“perennial ryegrass”
e1“AMF (G. hoi) enhanced the relative respiration rate of the root + soil system by 16%, inducing an extra C flow amounting to 3% of daily gross photosynthesis.”
Claim · model-written summary
AMF colonization altered sources supporting belowground respiration.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- AMF colonizatione0
- Interactor
- AMFe0symbiont
- Outcome
- sources supplying belowground respiratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AMF colonization affected the sources supplying belowground respiration, indicating a greater importance of plant C stores in supplying respiration and/or the participation of storage pools within fungal tissues.”
t0“perennial ryegrass”
Claim · model-written summary
AMF increased belowground carbon costs after accounting for ontogeny and nutrition.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- AMFe0
- Interactor
- AMFe0symbiont
- Outcome
- belowground C costse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When ontogenetic and nutritional effects were accounted for, AMF increased belowground C costs, which were not compensated by increased photosynthesis rates.”
t0“perennial ryegrass”
Claim · model-written summary
AMF carbon costs were not offset by photosynthesis.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- belowground C costse0
- Qualifier
- not compensated by increased photosynthesis ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When ontogenetic and nutritional effects were accounted for, AMF increased belowground C costs, which were not compensated by increased photosynthesis rates.”
t0“perennial ryegrass”
Claim · model-written summary
Mycorrhizal plants had lower instantaneous relative growth rate.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- mycorrhizal plantse0
- Interactor
- AMFe1symbiont
- Outcome
- instantaneous relative growth ratee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore the instantaneous relative growth rate was lower in mycorrhizal plants.”
t0“perennial ryegrass”
e1“AMF (G. hoi) enhanced the relative respiration rate of the root + soil system by 16%, inducing an extra C flow amounting to 3% of daily gross photosynthesis.”
The same questions in other papers
mycorrhiza · yield · Lolium perenne (perennial ryegrass)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
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mycorrhiza · growth · Lolium perenne (perennial ryegrass)Positive and negative results
2 papers in the same direction as this paper · 12 in the opposite direction
- positive
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11 papers more in this group
See all 15 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.