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Background  Changes of soil microbial communities are one of the main factors of continuous cropping problem.  Andrographis paniculata  has been reported to have replant problem in cultivation. However, little is known about the variations of rhizosphere soil microbial communities of  A. paniculata  under a continuous cropping system. Here, Illumina MiSeq was used to investigate the shifts of rhizospheric bacterial and fungal communities after continuous cropping of  A. paniculata .    Results  The bacterial diversity increased whereas the fungal diversity decreased in rhizosphere soil after consecutive  A. paniculata  monoculture; and the soil microbial community structure differed between newly plant soil and continuous cropped soil. Taxonomic analyses further revealed that the bacterial phyla  Proteobacteria ,  Acidobacteria  and  Bacteroidetes  and the fungal phyla  Zygomycota ,  Ascomycota  and  Cercozoa  were the dominant phyla across all soil samples. The relative abundance of phyla  Acidobacteria  and  Zygomycota  were significantly increased after continuous cropping. Additionally, the most abundant bacterial genus  Pseudolabrys  significantly decreased, while the predominant fungal genus  Mortierella  increased considerably in abundance after continuous cropping.    Conclusions  Our results revealed the changes on diversity and composition of bacterial and fungal communities in rhizospheric soil under continuous cropping of  A. paniculata . These data contributed to the understanding of soil micro-ecological environments in the rhizosphere of  A. paniculata .

Variations of rhizospheric soil microbial communities in response to continuous Andrographis paniculata cropping practices