Yeast diversity in crop-growing environments in Cameroon

Area of Science:

• Microbiology
• Food Science
• Agricultural Science

Background:

• Yeast flora on agricultural products significantly impacts food quality and safety.
• Understanding yeast biodiversity is crucial for managing food production environments.

Purpose of the Study:

• To investigate yeast biodiversity on agricultural products from Cameroon.
• To compare culture-dependent and culture-independent methods for yeast identification.
• To determine the impact of yeast biodiversity on food products.

Main Methods:

• Isolation and identification of yeast strains using culture-dependent methods (direct and enrichment).
• Molecular identification using restriction fragment length polymorphism (RFLP) of the 5.8S-ITS region and sequencing of the D1/D2 domain of the 26S rRNA gene.
• Analysis of yeast biodiversity using culture-independent methods (DGGE) and DNA sequencing.

Main Results:

• A total of 151 yeast strains from 26 species were isolated and identified.
• Enrichment methods in high-sugar media successfully identified fermentative yeasts like Saccharomyces cerevisiae and Torulaspora delbrueckii.
• Culture-independent methods revealed fewer species but identified some missed by traditional methods, such as Candida tropicalis and Hanseniaspora uvarum.

Conclusions:

• Multiphasic approaches combining culture-dependent and -independent methods provide a comprehensive understanding of yeast biodiversity.
• These findings enhance knowledge of yeast flora in agricultural environments and their implications for food products.
• The study highlights the importance of diverse methodologies for accurate microbial assessment.