Microbial Communities Associated with Potato Common Scab-Suppressive Soil Determined by Pyrosequencing Analyses

Area of Science:

• Agricultural Science
• Microbiology
• Soil Science

Background:

• Potato common scab, caused by Streptomyces spp., is a significant agricultural problem globally.
• Current control methods for potato common scab are often ineffective, necessitating novel approaches.

Purpose of the Study:

• To investigate the microbial community differences between a disease-suppressive and a disease-conducive soil for potato common scab.
• To identify potential microbial indicators or agents responsible for common scab suppression.

Main Methods:

• Pyrosequencing was employed to analyze the bacterial communities in both soil types.
• DNA was extracted, and the 16S rRNA gene was used to characterize bacterial richness and diversity via operational taxonomic units (OTUs).

Main Results:

• The disease-suppressive soil exhibited higher bacterial diversity (859 OTUs) compared to the disease-conducive soil (565 OTUs).
• Significantly higher abundances of Lysobacter and specific Acidobacteria groups (4 and 6) were detected in the suppressive soil.
• The genus Bacillus showed a significantly higher relative abundance in the disease-conducive soil.

Conclusions:

• The biological basis for common scab suppression in the identified Michigan field is linked to distinct soil microbial community structures.
• Lysobacter and certain Acidobacteria may play a role in suppressing Streptomyces spp. responsible for potato common scab.
• Understanding these microbial dynamics can inform the development of biological control strategies for potato production.