Abstract
ABSTRACT Serpula himantioides is a widely distributed wood rot fungus that causes heart rot in various tree species. In Japan, heart rot due to S. himantioides occurs in Chamaecyparis pisifera ; however, changes in the wood fungal community composition accompanying the progression of heart rot in living trees remain unclear. In this study, we clarified the changes in the fungal community composition of heartwood as heart rot progresses by performing an amplicon sequence analysis using DNA samples collected from living C. pisifera trees with heart rot caused by S. himantioides . Additionally, the mode of decay progression was characterised according to non‐hierarchical clustering. The composition of S. himantioides sometimes reached extreme levels as heartwood decayed. This result is consistent with the findings of a previous study on heartwood decay in broad‐leaved tree logs. However, there was no clear relationship between fungal diversity and the decrease in wood density, which was inconsistent with the results of a previous study on logs. Thus, this inconsistency may be influenced by the highly selective environment within heartwood. A clustering analysis grouped samples into four clusters, and the trophic modes and wood saprotroph decay types of indicator operational taxonomic units (OTUs), which characterised each cluster, changed during the decay process. The indicator OTUs and environmental variables for each cluster revealed that the four clusters corresponded to the pre‐decay and incipient, intermediate and advanced decay stages. The study findings may be useful for further elucidating the decay of living trees infected by wood rot fungi.
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Claims 6
Claim · model-written summary
Serpula himantioides community composition sometimes reached extreme levels as living tree heartwood decayed.
- Taxon
- S. himantioides
Serpula himantioidese0 - Organ / stage
- heartwoode0
- Interactor
- C. pisifera
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Chamaecyparis pisiferae1host - Outcome
- composition of S. himantioidese0
- Direction
- extreme levelse0
- Qualifier
- sometimese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The composition of S. himantioides sometimes reached extreme levels as heartwood decayed.”
e1“living C. pisifera trees with heart rot caused by S. himantioides”
Claim · model-written summary
Fungal diversity had no clear relationship with declining wood density in living Chamaecyparis pisifera heartwood.
- Taxon
- Chamaecyparis pisiferaChamaecyparis pisiferat0
- Outcome
- wood densitye0
- Qualifier
- no clear relationshipe0
- Comparator
- fungal diversitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no clear relationship between fungal diversity and the decrease in wood density”
t0“Chamaecyparis pisifera”
Claim · model-written summary
The selective heartwood environment may explain disagreement with previous log studies about fungal diversity and wood density.
- Taxon
- Chamaecyparis pisiferaChamaecyparis pisiferat0
- Organ / stage
- heartwoode0
- Outcome
- inconsistencye0
- Qualifier
- highly selective environment within heartwoode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this inconsistency may be influenced by the highly selective environment within heartwood.”
t0“Chamaecyparis pisifera”
Claim · model-written summary
Clustering grouped the heartwood samples into four clusters.
- Taxon
- Chamaecyparis pisiferaChamaecyparis pisiferat0
- Outcome
- grouped samplese0
- Value
- four clusterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A clustering analysis grouped samples into four clusters”
t0“Chamaecyparis pisifera”
Claim · model-written summary
Indicator OTU trophic modes and wood saprotroph decay types changed through heartwood decay.
- Taxon
- Chamaecyparis pisiferaChamaecyparis pisiferat0
- Outcome
- trophic modes and wood saprotroph decay typese0
- Qualifier
- changed during the decay processe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the trophic modes and wood saprotroph decay types of indicator operational taxonomic units (OTUs), which characterised each cluster, changed during the decay process.”
t0“Chamaecyparis pisifera”
Claim · model-written summary
The four clusters corresponded to pre-decay, incipient, intermediate and advanced heartwood decay stages.
- Taxon
- Chamaecyparis pisiferaChamaecyparis pisiferat0
- Outcome
- four clusters corresponded to the pre‐decay and incipient, intermediate and advanced decay stagese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The indicator OTUs and environmental variables for each cluster revealed that the four clusters corresponded to the pre‐decay and incipient, intermediate and advanced decay stages.”
t0“Chamaecyparis pisifera”