Gao, Jin and Chen, Liting and Wang, Jingjing and Zhao, Weichao and Zhang, Jiangli and Qin, Zhao and Wang, Mingzhu and Chen, Xia and Li, Mingjun and Yang, Qingxiang (2024) Response of the Symbiotic Microbial Community of Dioscorea opposita Cultivar Tiegun to Root-Knot Nematode Infection. PLANT DISEASE, 108 (8). pp. 2472-2483. ISSN 0191-2917, 1943-7692
Full text not available from this repository. (Request a copy)Abstract
Yam is an important medicinal and edible dual-purpose plant with high economic value. However, nematode damage severely affects its yield and quality. One of the major effects of nematode infestations is the secondary infection of pathogenic bacteria or fungi through entry wounds made by the nematodes. Understanding the response of the symbiotic microbial community of yam plants to nematodes is crucial for controlling such a disease. In this study, we investigated the rhizosphere and how endophytic microbiomes shift after nematode infection during the tuber expansion stage in the Dioscorea opposita Thunb. cultivar Tiegun. Our results revealed that soil depth affected the abundance of nematodes, and the relative number of Meloidogyne incognita was higher in the diseased soil at a depth of 16 to 40 cm than those at a depth of 0 to 15 and 41 to 70 cm. The abundance of and interactions among soil microbiota members were significantly correlated with root-knot nematode (RKN) parasitism at various soil depths. However, the comparison of the microbial alpha-diversity and composition between healthy and diseased rhizosphere soil showed no difference. Compared with healthy soils, the co-occurrence networks of M. incognita-infested soils included a higher ratio of positive correlations linked to plant health. In addition, we detected a higher abundance of certain taxonomic groups belonging to Chitinophagaceae and Xanthobacteraceae in the rhizosphere of RKN-infested plants. The nematodes, besides causing direct damage to plants, also possess the ability to act synergistically with other pathogens, especially Ramicandelaber and Fusarium, leading to the development of disease complexes. In contrast to soil samples, RKN parasitism specifically had a significant effect on the composition and assembly of the root endophytic microbiota. The RKN colonization impacted a wide variety of endophytic microbiomes, including Pseudomonas, Sphingomonas, Rhizobium, Neocosmospora, and Fusarium. This study revealed the relationship between RKN disease and changes in the rhizosphere and endophytic microbial community, which may provide novel insights that help improve biological management of yam RKNs.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MELOIDOGYNE-INCOGNITA; PLANT; MANAGEMENT; PARASITISM; IMMUNITY; co-occurrence networks; Meloidogyne incognita; microbial community; parasitism; root-knot nematode; yam |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Lehrstuhl für Zellbiologie und Pflanzenphysiologie (Prof. Dr. Klaus Grasser) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Nov 2025 09:19 |
| Last Modified: | 04 Nov 2025 09:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64921 |
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