Summary
A variety of habitats were sampled for the presence of Aureobasidium black yeasts with the attempt to find pullulan-producing strains. Habitats included leaves of mango (Mangifera indica Linn.), tamarind (Tamarindus indica Linn.), asoka (Saraca indica Linn.) and latex-painted and bathroom cement-wall surfaces. Parameters for the identification of the isolates included morphology, nutritional parameters, exopolysaccharide (EPS) production, and rDNA internal transcribed spacer (ITS) sequencing. All isolates of black yeasts were polymorphic with blastospores, hyphae, and chlamydospores. ITS analyses showed strong correlation with the GenBankA. pullulanssequences, with alignment using BLAST yielding greater than 95% similarity. All five isolates tested produced pullulan as deduced from infrared spectra and sensitivity to pullulanase. None produced aubasidan as evidenced from their IR spectra. The current studies support the notion that the hot, humid environments facilitate the development of A. pullulansand its tropical variants in diverse phylloplane and walls habitats, and merit support for further isolation and characterization of these black yeasts as a source of unique pullulan-producing strains.
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Prasongsuk, S., Sullivan, R.F., Kuhirun, M. et al. Thailand habitats as sources of pullulan-producing strains of Aureobasidium pullulans. World J Microbiol Biotechnol 21, 393–398 (2005). https://doi.org/10.1007/s11274-004-2237-x
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DOI: https://doi.org/10.1007/s11274-004-2237-x