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Panax ginseng  Meyer, a valuable medicinal plant, is severely threatened by rusty root, a condition that greatly affects its yield and quality. Studies investigating the relationship between soil microbial community composition and rusty roots are vital for the production of high-quality ginseng. Here, high-throughput sequencing was employed to systematically characterize changes in the soil microbial community associated with rusty roots. Fungal diversity was lower in the soils of rusty root-affected  P. ginseng  than in those of healthy plants. Importantly, principal coordinate analysis separated the fungal communities in the rhizosphere soils of rusty root-affected ginseng from those of healthy plants. The dominant bacterial and fungal genera differed significantly between rhizosphere soils of healthy and rusty root-affected  P. ginseng , and linear discriminant analysis effect size (LEfSe) further indicated a strong imbalance in the soil microbial community of diseased plants. Significantly enriched bacterial genera (including  Rhodomicrobium ,  Knoellia ,  Nakamurella ,  Asticcacaulis , and  Actinomadura ) were mainly detected in the soil of rusty root-affected  P. ginseng , whereas significantly enriched fungal genera (including  Xenopolyscytalum ,  Arthrobotrys ,  Chalara ,  Cryptococcus , and  Scutellinia ) were primarily detected in the soil of healthy plants. Importantly, five fungal genera ( Cylindrocarpon ,  Acrophialophora ,  Alternaria ,  Doratomyces , and  Fusarium ) were significantly enriched in the soil of rusty root-affected plants compared with that of healthy plants, suggesting that an increase in the relative abundance of these pathogenic fungi ( Cylindrocarpon ,  Alternaria , and  Fusarium ) may be associated with ginseng rusty roots. Additionally, this study is the first to report that an increase in the relative abundances of  Acrophialophora  and  Doratomyces  in the rhizosphere of  P. ginseng  may be associated with the onset of rusty root symptoms in this plant. Our findings provide potentially useful information for developing biological control strategies against rusty root, as well as scope for future screening of fungal pathogens in rusty roots of  P. ginseng .

biomed research international

Microbial Community Changes in the Rhizosphere Soil of Healthy and Rusty <i>Panax ginseng</i> and Discovery of Pivotal Fungal Genera Associated with Rusty Roots

Microbial Community Changes in the Rhizosphere Soil of Healthy and Rusty Panax ginseng and Discovery of Pivotal Fungal Genera Associated with Rusty Roots