Fungi associated with the potato taste defect in coffee beans from Rwanda

Botanical Studies - Tập 63 - Trang 1-8 - 2022
Amanda R. Hale1, Paul M. Ruegger1, Philippe Rolshausen2, James Borneman1, Jiue-in Yang3
1Department of Microbiology and Plant Pathology, University of California, Riverside, USA
2Department of Botany and Plant Sciences, University of California, Riverside, USA
3Department of Plant Pathology and Microbiology, National Taiwan University, Taipei, Taiwan

Tóm tắt

Potato taste defect (PTD) of coffee is characterized by a raw potato like smell that leads to a lower quality taste in the brewed coffee, and harms the commercial value of some East African coffees. Although several causes for PTD have been proposed, none of them have been confirmed. Recently, high throughput sequencing techniques and bioinformatic analysis have shown great potential for identifying putative causal agents of plant diseases. Toward the goal of determining the cause of PTD, we examined raw coffee beans from Rwanda exhibiting varying PTD scores using an Illumina-based sequence analysis of the fungal rRNA ITS region. Six fungal amplicon sequence variants (ASVs) with high relative abundances correlated with coffee taste scores. Four of these ASVs exhibited negative correlations – Aspergillus versicolor, Penicillium cinnamopurpureum, Talaromyces radicus, and Thermomyces lanuginosus – indicating that they might be causing PTD. Two of these fungi exhibited positive correlations – Kazachstania humilis and Clavispora lusitaniae – indicating that they might be inhibiting organisms that cause PTD. This study addressed PTD causality from a new angle by examining fungi with high throughput sequencing. To our knowledge, this is the first study characterizing fungi associated with PTD, providing candidates for both causality and biocontrol.

Tài liệu tham khảo

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