Interactions between common scab-inducing strains on potato suberin.
Mario Khalil1,2, Iauhenia Isayenka1, Rebeca Padilla-Reynaud1
1Centre SÈVE, Département de Biologie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada.
Canadian Journal of Microbiology
|March 14, 2025
Summary
Streptomyces scabies 87.22 better degrades potato suberin than emerging pathogens. This adaptation involves enhanced enzyme activity and gene expression, crucial for understanding potato common scab management.
Area of Science:
- Microbiology
- Plant Pathology
- Biochemistry
Background:
- Potato tuber periderm contains suberin, a complex polymer with aliphatic and aromatic domains.
- Streptomyces scabies is a primary cause of potato common scab, while S. acidiscabies and S. turgidiscabies are emerging pathogens.
Purpose of the Study:
- To compare the adaptation of S. scabies 87.22 to potato tuber suberin with that of S. acidiscabies ATCC 49003 and S. turgidiscabies Car8.
- To investigate the enzymatic and genetic mechanisms underlying suberin degradation by these Streptomyces species.
Main Methods:
- Growth experiments in suberin-supplemented media.
- Co-culturing experiments to observe strain interactions and antibiotic production.
- Enzyme activity assays (esterase, cellulase) and gene expression analysis.
Main Results:
- S. scabies 87.22 exhibited superior growth on suberin compared to the other strains.
- S. acidiscabies produced oxanthromicin, inhibiting other strains.
- S. scabies 87.22 showed higher esterase activity and cellulase gene induction, indicating better suberin aliphatic domain degradation.
- Emerging pathogens poorly utilized aromatic suberin components.
Conclusions:
- S. scabies 87.22 is better adapted to degrade potato periderm suberin than emerging pathogenic Streptomyces species.
- Understanding these interactions can inform ecologically-based strategies for managing potato common scab.
