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Tuberosphere and bulk soil microbial communities in fields differing in common scab severity are distinguished by soil chemistry and interactions with pathogens

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Abstract

Purpose

Common scab of potatoes (CS) is influenced by plant-microbe-soil interactions, which are locally specific. The study aims to identify any common trends in such interactions across a landscape differentiated by soil pH and CS severity.

Methods

The 33 sites and 17 cultivars were characterized using soil and periderm nutrient contents and microbial communities. Quantitative PCR and Illumina amplicon sequencing were used to assess abundance of bacteria, actinobacteria and pathogens, and community composition.

Results

Comparisons between bulk and tuberosphere soil compartments as well as potato cultivars divided to three categories of CS susceptibility revealed that nitrogen was elevated in tuberosphere soil and N, Mg and Fe were lowered in periderm of resistant cultivars. The susceptible cultivar Agria grown at 7 sites had higher Ca content in tuberosphere soil, while the resistant cultivar Adela grown at 10 sites had higher S, P and Mg contents in its tuberosphere soil and P and Fe in periderm. That suggests further interactions between plants and bacterial community involving nutrient uptake. Diversity of bacteria was positively correlated with CS severity suggesting interactions between the Streptomyces pathogen populations and the local soil community.

Conclusions

Overall, pathogen abundance assessed by quantifying the thaxtomin biosynthetic txtB genes were randomly dispersed among the sites without connections to CS severity or soil pH. Thus, the significant differences between bacterial communities of bulk and tuberosphere soils together with cultivar CS susceptibility showed that the susceptible cultivars select bacterial community relatively similar to the bulk soil, while the resistant cultivars promote more distinct communities.

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Data Availability

Illumina MiSeq amplicon sequences of bacterial 16 S rRNA genes are available in the NCBI Sequence Read Archive (www.ncbi.nlm.nih.gov/sra) as BioProjects PRJNA699043 and PRJNA474544. All other data is available in the Supplementary Material.

References

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Funding

This work was supported by the Ministry of Agriculture of the Czech Republic, project QK1810370 and Institutional Project RO4018.

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Authors and Affiliations

Authors

Contributions

M.S-M. organized the results and wrote the MS. E.S. and O.D. extracted DNAs, prepared PCRs. M.O. did statistical analyses. V.K., J.D., M.S-M. and J.K. collected samples at the sites. J.K. analyzed bacterial communities, and created figures and tables.

Corresponding author

Correspondence to Sagova-Mareckova Marketa.

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Conflicts of interest/Competing interests

All authors declare no conflict of interest.

Additional information

Responsible Editor: Hans Lambers.

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Supplementary Information

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Marketa, SM., Sarikhani, E., Daniel, O. et al. Tuberosphere and bulk soil microbial communities in fields differing in common scab severity are distinguished by soil chemistry and interactions with pathogens. Plant Soil 468, 259–275 (2021). https://doi.org/10.1007/s11104-021-05128-z

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  • DOI: https://doi.org/10.1007/s11104-021-05128-z

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