Complex interactions among soil physicochemical interactions and microbial community associations with potato common...

Area of Science:

• Agricultural Science
• Plant Pathology
• Microbiology

Background:

• Potato common scab, caused by *Streptomyces* species, significantly reduces yield and quality globally.
• While soil properties and microbial communities are linked to disease severity, their interactive effects are not fully understood.

Purpose of the Study:

• To investigate the combined influence of soil physicochemical properties and microbial communities on potato common scab severity.
• To identify key soil and microbial factors associated with different disease severity levels.

Main Methods:

• Multi-year field study (124 sites) in South Korea.
• Analysis of soil physicochemical properties.
• High-throughput 16S rRNA and ITS amplicon sequencing for microbial community profiling.
• Random forest modeling to assess predictive accuracy of soil properties.

Main Results:

• Random forest modeling showed moderate predictive accuracy for disease severity based on soil properties, with low importance for individual variables, indicating complex interactions.
• Distinct microbial taxa correlated with disease severity: Rhodanobacteraceae and Mortierellaceae for low severity, Sphingomonadaceae, Chaetomiaceae, and Cystofilobasidiaceae for high severity.
• No single dominant factor explained common scab severity, highlighting the interplay of multiple drivers.

Conclusions:

• Potato common scab development is governed by intricate interactions between soil physicochemical conditions and microbial communities.
• Effective management strategies for common scab may require a holistic approach considering these complex interactions.