Intercropping with marigold promotes soil health and microbial structure to assist in mitigating tobacco bacterial wilt
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ORIGINAL ARTICLE
Intercropping with marigold promotes soil health and microbial structure to assist in mitigating tobacco bacterial wilt Yanyan Li 1
&
Ji Feng 1 & Lu Zheng 2 & Junbin Huang 2 & Yong Yang 3 & Xihong Li 1
Received: 21 September 2019 / Accepted: 10 January 2020 # The Author(s) 2020
Abstract Marigold is reported to have antibacterial activity, and effectively protect crops against soil-borne diseases. However, it is not known whether and how tobacco bacterial wilt (TBW) could be mitigated via intercropping with marigold under field conditions. In this study, a field experiment was performed to measure and compare the occurrence of TBW, the soil chemical properties, and soil microbial composition and diversity between a tobacco-marigold intercropping system and a tobacco monocropping system. At 100 days (d) post-transplantation, the incidence (I) and disease index (DI) for the tobacco-marigold intercropping system were 30.12% and 58.25% lower than that for tobacco monocropping system, respectively. The results showed that Sobs, Shannon and Chao 1 index of soil bacterial communities in the tobacco-marigold intercropping system were 10.34%, 1.41% and 5.13% higher than that in the tobacco monocropping system at 100 d post-transplantation, respectively. It exhibited a higher richness and diversity of soil bacterial communities in the tobacco-marigold intercropping system. The relative abundance of some beneficial genera in tobacco-marigold intercropping system, such as Lysobacter, Burkholderia, Trichoderma, Mortierella, Chaetomium, Penicillium, was 1.50, 1.61, 3.35, 1.67, 4.40 and 4.50 fold higher than that in tobacco monocropping system. The presence of the intercropping system inhibited soil acidification and loss of soil calcium ions. The redundancy analysis (RDA) indicated that soil pH and exchange Ca2+ were the main environmental factors which seemed to influence the bacterial and fungal community. The results from this study provided valuable insight into the possible mechanisms enhancing soil health in the tobacco-marigold intercropping system. Keywords Marigold . Tobacco bacterial wilt . Intercropping . Soil chemical properties . Microbial communities
Introduction Tobacco bacterial wilt (TBW), caused by Ralstonia solanacearum phylotype I, is one of the major soil-borne diseases affecting cultivated tobacco (Nicotiana tabacum) (Liu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42161-020-00490-w) contains supplementary material, which is available to authorized users. * Yong Yang [email protected] * Xihong Li [email protected] 1
Tobacco Research Institute of Hubei Province, Wuhan 430030, China
2
The Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
3
School of Life Sciences, Hubei University, Wuhan 430062, China
et al. 2013). R. solanacearum is considered the most important and destructive bacterial plant pathogen (Mansfied et al. 2012) for its devastat
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