A preliminary study on the influence of invasive plant through allelopathy: effects of Chinese tallow tree, Triadica sebifera (Euphorbiaceae), on its rhizosphere microbial community in Miyajima Island, SW Japan

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Invasive plants can release allelopathic compounds that inhibit or enhance the growth of other plants and microorganisms in the surrounding environment. In this study, we performed the next-generation sequencing (NGS) analyses to compare the genes of the soil microbial communities in a natural forest and an open place where Triadica sebifera (L.) Small, a typical invasive plant, grows in Miyajima Island, Hiroshima Prefecture, Japan. We collected soil samples in May 2022, the litter layer of Chinese tallow completely decomposed. Our data suggested that the invaded site of T. sebifera have different genetic composition of soil bacterial and fungal species, and in bacterial metabolic pathways. The result also seemed indicate that T. sebifera recruited several microbes including plant growth-promoting rhizobacteria (PGPRs), such as Sphingomonas, which may be involved two potential degradations of allelopathic compounds in the rhizosphere soil of Chinese tallow tree. A more detailed chemical analysis will also be needed to distinguish whether the allelopathic substances recruiting microorganisms come from the fallen leaves or from the exudation of roots. This study provided a new insight into the invasion and establishment of invasive plants with the possibility of bacteria involved allelopathy process in the soil. We also found that using different kits for extracting DNA and PCR could affect the NGS results.

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  • ヒコビア

    ヒコビア 18 (4), 199-220, 2022-12-28

    ヒコビア会

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