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Summary  The bacterial communities in the wound tissues of  Pinus massoniana  were analysed by 16S rDNA amplicon sequencing. The results showed that the bacterial richness and diversity changed remarkably whether the wound was inoculated with pine wood nematode (PWN;  Bursaphelenchus xylophilus ) or not after 12 h. However, the predominant bacteria  Stenotrophomonas , Burkholderiaceae,  Pseudomonas ,  Serratia  and  Delftia , introduced by PWN in the wound tissues, changed within 6 h. After 6 h of PWN inoculation, the most abundant genus associating with PWN,  Stenotrophomonas , failed to colonise the wound tissues, and the abundance of  Delftia  decreased, while the other representative bacteria, Burkholderiaceae,  Pseudomonas  and  Serratia , from the PWN were markedly enriched. In addition, our study is the first to report the association of  Serratia liquefaciens  with PWN. Predicted functional analyses using the Tax4Fun tool showed that the alterations in bacterial composition also led to shifts in their functional pathways, especially after 12 h of PWN inoculation. These findings clarified that the bacteria carried by PWN were responsible for the alterations in bacterial communities in the wound tissues and will shed light on the invasion mechanism of PWN.

Early changes in bacterial communities in wound tissues of Pinus massoniana after inoculation with Bursaphelenchus xylophilus