Deciphering the effects of crop rotation on tobacco bacterial wilt through general and specific disease suppression

Hai-kun Ma, Zhi-jiang Wang, Meng-jiao Li, Qing-lin Rao, Jun Cai* (Corresponding author), Xiao-fei Gu* (Corresponding author)

*Corresponding author for this work

Research output: Contribution to journal/periodicalArticleScientificpeer-review

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Abstract

Tobacco bacterial wilt caused by Ralstonia solanacearum often occurs under monocropping. Crop rotation significantly reduces disease by changing the microbial communities, both taxonomically and functionally, in the tobacco rhizosphere. In this study, tobacco rhizosphere soils were sampled from monocropping and tobacco-maize rotation fields. Based on metagenomic sequencing, measurements of soil properties, and the quantification of R. solanacearum, the results showed that rotation with maize increased the microbial diversity, complexity of microbial networks, and soil nutrient level in the tobacco rhizosphere and led to better tobacco growth. Tobacco rhizosphere microbes in monocropping fields were enriched for proteins related to pathogenicity and host infection processes. Moreover, microbes from the tobacco-maize rotation field had the strongest negative correlations with R. solanacearum. These microbes were mainly Actinobacteria, especially Solirubrobacter. Although the abundance of R. solanacearum did not significantly differ between monocropping and crop rotation fields, R.solanacearum did not cause outbreaks in tobacco-maize rotation fields, as there were no disease symptoms on tobacco. Based on structural equation modeling, we identified that general disease suppression had a stronger influence on R. solanacearum and tobacco performance than specific disease suppression. Moreover, general disease suppression may facilitate the establishment of specific disease suppression. This study revealed the functional changes in the rhizosphere microbiome and the mechanisms of disease suppression under tobacco-maize rotation. Our study further indicated that crop rotation could lead to the establishment of specific disease suppression in the longer term.
Original languageEnglish
JournalEuropean Journal of Plant Pathology
DOIs
Publication statusPublished - 06 Oct 2023

Keywords

  • General disease suppression
  • Monocropping
  • R. solanacearum
  • Solirubrobacter
  • Tobacco-maize rotation

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