Affiliation:
1. Department of Forest Sciences, University of Helsinki, Helsinki, Finland
2. Natural Resources Institute Finland (Luke), Helsinki, Finland
Abstract
ABSTRACT
The
Heterobasidion annosum
species complex is a major threat to the forest industry in the northern temperate regions of the world. The fungal and bacterial biota communities in
Heterobasidion
-infected trees have been extensively studied, but less is known about the interkingdom and intrakingdom interactions among the microbiome. The bacteria-fungi interkingdom analysis has revealed significant findings compared to the intrakingdom analysis in recent studies. In this study, we aimed to (i) unravel the contribution and development of the bacteria and other fungi in the
Heterobasidion
-infected wood decay process; (ii) uncover how environmental factors and the conifer pathogen drive the microbiome community structure and function changes; and (iii) identify the core microbiome during the
Heterobasidion
-mediated wood decay process. Internal transcribed spacer and 16S amplicon sequencing data from the
Heterobasidion
fruiting body and its associated woody tissue were applied in this analysis. Samples collected from managed forest and nature reserve forest were classified into four decay classes based on the extent of decay of the wood. Our result showed that bacteria and fungi have different abundances and activities in both study materials. The
Heterobasidion
ecological correlation network is conserved, especially in the fruiting body. The core microbiome defined in our analysis showed huge potential for the microbiome community’s functioning. A particular
Heterobasidion
Operational Taxonomic Units (OTU) had the most important impact on the community and disease development. Forest management has the biggest impact on the microbiome assembly, and the fungal community is more sensitive to environmental changes.
IMPORTANCE
We applied macro- (forest stand and forest management) and micro-scale (bacterial and fungal community) analyses for a better understanding of the
Heterobasidion
pathosystem and associated wood decay process. The core microbiome, as defined by hierarchy analysis and a consistent model, and environmental factors correlation with the community assembly were found to be novel.
Funder
Ministry of Agriculture and Forestry, Finland
Chinese Scholarship Council
Research Council of Finland
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology