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Agronomy
Volume 16
Issue 1
10.3390/agronomy16010080
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Article

New Insights into the Formation Mechanism of Continuous Cropping Obstacles in Dioscorea opposita Thunb. cv. Tiegun Yam from Rhizosphere Metabolites and Microflora

by
Pengfei Zhang
1,2,
Wanghui Guan
2,
Lili Han
2,
Xiaoli Hu
2,
Ailing Xu
2,
Hui Wang
2,
Xiaomin Wang
2,* and
Xiaoyan Jiao
1,*
1
College of Resources and Environment, Shanxi Agricultural University, Taiyuan 030031, China
2
Cotton Research Institute, Shanxi Agricultural University, Yuncheng 044000, China
*
Authors to whom correspondence should be addressed.
Agronomy 2026, 16(1), 80; https://doi.org/10.3390/agronomy16010080 (registering DOI)
Submission received: 5 November 2025 / Revised: 22 December 2025 / Accepted: 24 December 2025 / Published: 26 December 2025
(This article belongs to the Section Farming Sustainability)
Versions Notes

Abstract

Continuous cropping (CC) poses serious challenges to the sustainable production of Dioscorea opposita Thunb. cv. Tiegun yam. The aim of this study is to illustrate the formation mechanisms of CC obstacles by analyzing rhizosphere soil from yam fields with 0 to 2 years of replanting. Metabolomic and microbiome sequences were used to assess variations in yam yield, underground tuber traits, soil properties, metabolite profiles, and microbial communities. The results show that CC significantly reduced tuber yield, shortened stalk length, and altered tuber morphology, leading to the accumulation of soil available phosphorus and potassium and a notable decrease in pH. A total of 38 differentially expressed metabolites, including organoheterocyclic compounds, lipids, and benzenoids, were identified and linked to pathways such as starch and sucrose metabolism, linoleic acid metabolism, and ABC transporters. Microbial alpha diversity increased with CC duration, and both bacterial and fungal community structures were notably reshaped. Metabolite profiles correlated more strongly with fungal than bacterial communities. Partial least squares path modeling revealed that CC years had a negative indirect impact on tuber yield and morphology (the path coefficient was −0.956), primarily through direct effects on soil properties (p < 0.01) and metabolites (p < 0.001), which, in turn, influenced microbial diversity. These findings emphasize the vital role of soil properties in reshaping the rhizosphere environment under CC and provide a theoretical basis for mitigating CC obstacles through rhizosphere regulation.
Keywords: Dioscorea opposita Thunb. cv. Tiegun yam; metabolism; microbial community; continuous cropping Dioscorea opposita Thunb. cv. Tiegun yam; metabolism; microbial community; continuous cropping

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MDPI and ACS Style

Zhang, P.; Guan, W.; Han, L.; Hu, X.; Xu, A.; Wang, H.; Wang, X.; Jiao, X. New Insights into the Formation Mechanism of Continuous Cropping Obstacles in Dioscorea opposita Thunb. cv. Tiegun Yam from Rhizosphere Metabolites and Microflora. Agronomy 2026, 16, 80. https://doi.org/10.3390/agronomy16010080

AMA Style

Zhang P, Guan W, Han L, Hu X, Xu A, Wang H, Wang X, Jiao X. New Insights into the Formation Mechanism of Continuous Cropping Obstacles in Dioscorea opposita Thunb. cv. Tiegun Yam from Rhizosphere Metabolites and Microflora. Agronomy. 2026; 16(1):80. https://doi.org/10.3390/agronomy16010080

Chicago/Turabian Style

Zhang, Pengfei, Wanghui Guan, Lili Han, Xiaoli Hu, Ailing Xu, Hui Wang, Xiaomin Wang, and Xiaoyan Jiao. 2026. "New Insights into the Formation Mechanism of Continuous Cropping Obstacles in Dioscorea opposita Thunb. cv. Tiegun Yam from Rhizosphere Metabolites and Microflora" Agronomy 16, no. 1: 80. https://doi.org/10.3390/agronomy16010080

APA Style

Zhang, P., Guan, W., Han, L., Hu, X., Xu, A., Wang, H., Wang, X., & Jiao, X. (2026). New Insights into the Formation Mechanism of Continuous Cropping Obstacles in Dioscorea opposita Thunb. cv. Tiegun Yam from Rhizosphere Metabolites and Microflora. Agronomy, 16(1), 80. https://doi.org/10.3390/agronomy16010080

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