Isolation and Identification of Oleaginous Yeasts from Soils at Bang Phra Reservoir, Chonburi Province

Authors

  • Sasiwimon Chomchuen
  • Manassawee Arkornnak
  • Patcharanan Amornrattanapan ภาควิชาจุลชีววิทยา คณะวิทยาศาสตร์ ม.บูรพา

Abstract

Lipid from oleaginous yeasts could be exploited for several applications including the production of biodiesel which is an alternative energy that has been gaining much interest recently. This research aimed to isolate and identify potential oleaginous yeasts from soil samples collected at Bang Phra reservoir in Chonburi province.   A total of 39 isolates of yeast were obtained and further screened for intracellular lipid production by Nile red fluorescence assay followed by Sudan Black B staining to observe lipid accumulation in yeast cells. The result showed that there were 8 yeast isolates; I2, J1, J2, J5, L1, L4, M2 and O3 that exhibited high level of intracellular lipid accumulation potential. Identification of yeasts based on nucleotide sequencing of ITS1-5.8S rDNA-ITS2 regions as well as phylogenetic analysis showed that I2, J5 and L1 were identified as Candida tropicalis, J1 and M2 were identified as Cyberlindnera sp., and J2 and O3 were identified as Schwanniomyces vanrijiae var. vanrijiae and L4 was identified as Schwanniomyces sp. These yeast strains belong to the same phylum (Ascomycota) which are divided into 2 families as following; Candida and Schwanniomyces are members of the family Debaryomycetaceae and Cyberlindnera is a member of the family Phaffomycetaceae. This research suggested that soil could be an interesting habitat of potential oleaginous yeasts and this work also provided fundamental and important knowledges for further studies aiming for useful applications. Keywords : microbial lipid ; oleaginous yeasts ; Candida ; Cyberlindnera ; Schwanniomyces

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Published

2021-05-05