As always, clicking past the newspaper headline and through to the research shows that it is the newsroom that introduces this confusion. Here’s the abstract, showing that the microbiome is indeed assumed and the paper is offering an initial exploration as to what precisely this microbiome consists of:

> Despite significant advances in microbiome research across various environments, the microbiome of Earth’s largest biomass reservoir—the wood of living trees—remains largely unexplored. Here, we illuminate the microbiome inhabiting and adapted to wood and further specialized to individual host tree species, revealing that wood is a harbour of biodiversity and potential key players in tree health and forest ecosystem functions. We demonstrate that a single tree hosts approximately one trillion bacteria in its woody tissues, with microbial communities distinctly partitioned between heartwood and sapwood, each maintaining unique microbiomes with minimal similarity to other plant tissues or ecosystem components. The heartwood microbiome emerges as a particularly unique ecological niche, distinguished by specialized archaea and anaerobic bacteria driving consequential biogeochemical processes. Our findings support the concept of plants as ‘holobionts’—integrated ecological units of host and associated microorganisms—with implications for tree health, disease and functionality. By characterizing the composition, structure and functions of tree internal microbiomes, our work opens up pathways for understanding tree physiology and forest ecology and establishes a new frontier in environmental microbiology.

Can we get lab made wood then ?