Variation in Microbiota and Chemical Components Within Pinus massoniana During Initial Wood Decay

Area of Science:

• Forest Ecology
• Microbial Ecology
• Wood Decomposition

Background:

• Deadwood is crucial for forest ecosystem productivity and stability.
• Deadwood-inhabiting microbes are key decomposition agents, but initial community shifts are poorly understood.

Purpose of the Study:

• To track the shift in deadwood xylem microbiota during the initial decay phase.
• To investigate the influence of bark type on these microbial changes.
• To explore the relationship between microbial communities and metabolites during deadwood decay.

Main Methods:

• Dense sampling from different log portions (top, middle, bottom) of Pinus massoniana.
• Analysis of xylem mycobiota and metabolite profiles.
• Univariate analysis and correlation analysis to identify key drivers and relationships.

Main Results:

• Xylem mycobiota exhibited dramatic variations during initial deadwood decay.
• Microbial communities likely originate from endophytic microbes of living trees.
• Bark type was identified as a significant driving factor for xylem mycobiota changes.
• Ten upregulated metabolites were identified, correlating with specific microbial classes.

Conclusions:

• Initial deadwood decay involves significant shifts in xylem microbial communities.
• Endophytic microbes and bark type are crucial factors influencing these shifts.
• Microbial community composition is linked to metabolite profiles during decomposition.