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Response of Pine Rhizosphere Microbiota to Foliar Treatment with Resistance-Inducing Bacteria against Pine Wilt Disease
oleh: Gil Han, Mohamed Mannaa, Namgyu Kim, Hee Won Jeon, Hyejung Jung, Hyun-Hee Lee, Junheon Kim, Jungwook Park, Ae Ran Park, Jin-Cheol Kim, Young-Su Seo
Format: | Article |
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Diterbitkan: | MDPI AG 2021-03-01 |
Deskripsi
In this study, two bacterial strains, IRP7 and IRP8, were selected to induce resistance against pine wilt disease (PWD). Foliar application with these strains to nematode-inoculated pine seedlings significantly reduced PWD severity. The effect of nematode inoculation and bacterial treatment on the rhizosphere bacterial community was investigated. The results indicated that the rhizosphere of nematode-inoculated seedlings contained a lower relative abundance of beneficial microbes such as <i>Paraburkholderia</i>, <i>Bradyrhizobium</i>, <i>Rhizobacter</i>, <i>Lysobacter</i>, and <i>Caballeronia.</i> Bacterial treatment resulted in significant changes in the microbes that were represented in relatively low relative abundance. Treatment with IRP7 resulted in an increase in the relative abundance of <i>Nitrospirillum</i>, <i>Bacillus</i>, and <i>Luteibacter</i>, which might be useful for protection against infection. Treatment with IRP8 resulted in an increase in the relative abundance of obligate bacterial predators of the <i>Bdellovibrio</i> genus that were previously shown to control several bacterial phytopathogens and may have a role in the management of nematode-carried bacteria. The selected bacteria were identified as <i>Pseudomonas koreensis</i> IRP7 and <i>Lysobacter enzymogenes</i> IRP8 and are suggested as a potential treatment for induced resistance against PWD. To our knowledge, this is the first report on the effect of foliar treatment with resistance-inducing bacteria on the rhizosphere microbiota.