Significant relationship between soil bacterial community structure and incidence of bacterial wilt disease under contin
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ORIGINAL PAPER
Significant relationship between soil bacterial community structure and incidence of bacterial wilt disease under continuous cropping system Siyuan She1,2 · Jiaojiao Niu1,2 · Chao Zhang3 · Yunhua Xiao1,2 · Wu Chen3 · Linjian Dai3 · Xueduan Liu1,2 · Huaqun Yin1,2
Received: 6 May 2016 / Revised: 22 August 2016 / Accepted: 28 September 2016 © Springer-Verlag Berlin Heidelberg 2016
Abstract Soil bacteria are very important in biogeochemical cycles and play significant role in soil-borne disease suppression. Although continuous cropping is responsible for soil-borne disease enrichment, its effect on tobacco plant health and how soil bacterial communities change are yet to be elucidated. In this study, soil bacterial communities across tobacco continuous cropping time-series fields were investigated through high-throughput sequencing of 16S ribosomal RNA genes. The results showed that long-term continuous cropping could significantly alter soil microbial communities. Bacterial diversity indices and evenness indices decreased over the monoculture span and obvious variations for community structures across the three time-scale tobacco fields were detected. Compared with the first year, the abundances of Arthrobacter and Lysobacter showed a significant decrease. Besides, the abundance of the pathogen Ralstonia spp. accumulated Communicated by Shuang-Jiang Liu. Electronic supplementary material The online version of this article (doi:10.1007/s00203-016-1301-x) contains supplementary material, which is available to authorized users.
over the monoculture span and was significantly correlated with tobacco bacterial wilt disease rate. Moreover, Pearson’s correlation demonstrated that the abundance of Arthrobacter and Lysobacter, which are considered to be beneficial bacteria had significant negative correlation with tobacco bacterial wilt disease. Therefore, after long-term continuous cropping, tobacco bacterial wilt disease could be ascribed to the alteration of the composition as well as the structure of the soil microbial community. Keywords Continuous cropping · Microbial community structure · Bacterial wilt disease
Introduction Continuous cropping refers to the practice of cultivating the same crop in soils that had previously supported the same or similar plant species year after year (Shipton 1977). Long-term continuous cropping usually leads to yield decline as well as soil-borne plant pathogen enrichment in soil (Yang et al. 2012; Liu et al. 2014).
* Huaqun Yin [email protected]
Linjian Dai [email protected]
Siyuan She [email protected]
Xueduan Liu [email protected]
Jiaojiao Niu [email protected]
1
Chao Zhang [email protected]
School of Minerals Processing and Bioengineering, Central South University, No. 932, South Lushan Road, Changsha 410083, China
2
Yunhua Xiao [email protected]
Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
3
College of Agronomy, Hunan Agricultural University, Changsha 410128, China
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