The fermentation of the Theobroma cacao beans, involving yeasts, lactic acid bacteria, and acetic acid bacteria, has a major influence on the quality of the resulting cocoa. An assessment of the microbial community of cocoa bean heap fermentations in Ghana resulted in 91 yeast isolates. These were grouped by PCR-fingerprinting with the primer M13. Representative isolates were identified using the D1/D2 region of the large subunit rRNA gene, internal transcribed spacer sequences and partial actin gene sequences leading to the detection of 15 species. Properties of importance for cocoa bean fermentation, namely sucrose, glucose, and citrate assimilation capacity, pH-, ethanol-, and heat-tolerance, were examined for selected isolates. Pichia kudriavzevii (Issatchenkia orientalis), Saccharomyces cerevisiae, and Hanseniaspora opuntiae formed the major components of the yeast community. Hanseniaspora opuntiae was identified conclusively for the first time from cocoa fermentations. Among the less frequently encountered species, Candida carpophila, Candida orthopsilosis, Kodamaea ohmeri, Meyerozyma (Pichia) caribbica, Pichia manshurica, Saccharomycodes ludwigii, and Yamadazyma (Pichia) mexicana were not yet documented from this substrate. Hanseniaspora opuntiae was preferably growing during the earlier phase of fermentation, reflecting its tolerance to low pH and its citrate-negative phenotype, while no specific temporal distribution was recognized for P. kudriavzevii and S. cerevisiae.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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Evidence ID | Analyze ID | File | Description |
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