Composition and function of sourdough microbiota: From ecological theory to bread quality

Area of Science:

• Microbial Ecology
• Food Science
• Bacteriology

Background:

• Sourdough is a traditional leavening agent and baking improver for artisanal and clean-label products.
• Sourdough microbiota composition is influenced by propagation methods and fermentation substrates.
• Understanding sourdough microbial ecology is crucial for optimizing bread quality.

Purpose of the Study:

• To explore the application of community assembly concepts in sourdough microbial ecology.
• To elucidate the roles of diversification, drift, dispersal, and selection in shaping sourdough microbiota.
• To link microbial traits and community dynamics to bread quality.

Main Methods:

• Review and synthesis of existing research on sourdough microbial ecology.
• Application of community assembly theory (diversification, drift, dispersal, selection).
• Analysis of bacterial metabolic traits and their influence on fermentation and bread quality.

Main Results:

• Dispersal limitation is key in short-term sourdough propagation, while selection dominates long-term propagation.
• Evidence for diversification is inconclusive; drift plays a role in specific cases.
• Specific bacterial metabolic traits (maltose utilization, exopolysaccharide formation, etc.) are critical for competitiveness and bread quality.

Conclusions:

• Community assembly concepts offer a valuable framework for understanding sourdough microbial ecology.
• Microbial community dynamics significantly influence sourdough fermentation and final bread characteristics.
• This approach aids in understanding how fermentation technology impacts sourdough microbiota and bread quality.