Determination of fungal diversity of acidic gruel by using culture-dependent and independent methods.

Abstract

Traditional fermented cereals are a rich source of naturally derived, diverse microorganisms. Illumina MiSeq high‐throughput sequencing was used to investigate thoroughly fungal microflora in Western Inner Mongolian acidic gruel. A total of 589,495 sequences were obtained from 16 acidic gruel samples. Ascomycota was found to be the predominant phylum with a relatively abundance of 97.54%, followed by Basidiomycota (2.26%) and Chytridiomycota (0.1%). The dominant genera obtained from the acidic gruel were Candida, Galactomyces, Hanseniaspora, Guehomyces, Zygosaccharomyces, Trichosporon, Rhodosporidium, Penicillium, and Blastobotrys. Candida and Galactomyces were predominant genera, and their relative abundances were 57.59% and 34.95%, respectively. A total of 50 yeast strains were isolated and identified. Statistical analysis indicated that P kudriavzevii and Geo. silvicola affiliated with Ascomycota were the dominant yeasts in acidic gruel, accounting for 28% and 22%, respectively. This study provides an unequivocal theoretical basis for the study of fungal diversity and the identification and preservation of yeasts in traditional fermented cereals. It also provides validated strain resources for further exploration of the effect of yeasts on acidic gruel quality.