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Title: $Protoplast preparation and regeneration from spores of the biocontrol fungus<i>Pseudozyma flocculosa</i>
Abstract: This paper describes a specific protocol for yielding and regenerating protoplasts from spores of the recently described powdery mildew biocontrol agent Pseudozyma flocculosa. With this protocol, a large quantity of protoplasts was obtained from β-mercaptoethanol-pretreated spores in 3-day-old cultures of P. flocculosa grown in YMPD. Enzymatic digestion was optimal with 0.5% Novozym 234 and 5% Glucanex prepared in 0.6 M KCl in 0.1 M citrate buffer. All liberated protoplasts fluoresced in the presence of fluorescein diacetate indicating that viability was nearly 100%. The regeneration rate was equally outstanding reaching 75% when 0.8 M sucrose was used as osmotic stabilizer in the regeneration medium. This protocol will find useful applications in genetic studies of this poorly characterized and understood biocontrol agent.