High-quality spawn is essential for oyster mushroom cultivation. For commercial use, growers mainly adopt multi-spore isolation and tissue isolation; single-spore isolation is rarely used due to complicated operations. This guide simplifies isolation methods and mother culture production for all-level growers.
1. Two Main Spawn Isolation Methods
1.1 Multi-Spore Isolation
Produce hybrid pure mycelium by collecting and germinating mushroom spores, suitable for large-scale strain breeding.
Prepare, sterilize and cool 0.8–1.0 cm culture medium in flasks.
Select healthy and near-mature oyster mushrooms, disinfect caps with 75% alcohol after cleaning.
Cut caps into 2cm pieces, suspend them gill-side down to collect spores.
Incubate at 25℃. Spores germinate in 7 days, then transfer mycelia to test tubes as mother spawn.
1.2 Tissue Isolation (Most Popular)
Extract internal mushroom tissue to cultivate pure spawn. It features fast growth and stable genetics, ideal for beginners and mass production.
Pick intact early-mature mushrooms, air-dry 1-2 hours.
Clean and disinfect the mushroom surface with 75% alcohol.
Aseptically take a mung bean-sized tissue from the gill-stipe junction and place it on slant medium.
Cultivate at 25℃; mycelia sprout within 2–3 days, screen uncontaminated strains for use.
2. Simplified Mother Culture Production
Mother culture production includes medium preparation and aseptic propagation, and sterile conditions are mandatory throughout the process.
2.1 Process Flow
Medium: Weigh → Cook & Filter → Fill tubes → Sterilize → Cool → Sterility test
Propagation: Disinfection → Inoculation → Cultivation → Inspection → Finished spawn
2.2 Medium Formulas (1000mL Water, pH 6.5–7.0)
Basic: 200g potato, 20g glucose, 18–20g agar, 3g potassium dihydrogen phosphate, 1.5g magnesium sulfate
Enhanced: Basic formula + 5g peptone for faster mycelium growth
2.3 Core Operating Steps
Raw materials: Peel potatoes, remove toxic bud eyes, cut into small cubes and weigh all ingredients.
Make medium: Boil potatoes for 30 minutes and filter. Add agar, glucose and fertilizers; dissolve peptone with cold water in advance, then adjust water volume to 1000mL.
Fill & seal: Dispense hot medium into test tubes (1/4 tube length), seal with cotton plugs and wrap with kraft paper.
Sterilize & shape slants: Sterilize at 121℃ for 30 minutes. Tilt hot tubes to form slant medium and cool slowly.
Test sterility: Conduct 48-hour blank incubation at 28–30℃ to eliminate contaminated tubes.
Inoculate: Inoculate under flame sterile environment; one original tube can supply 15–20 new test tubes.
Cultivate & store: Label tubes and culture at 23–25℃ for 7–10 days. Finished spawn can be stored for 2–3 months under 4℃ refrigeration.
3. Grower Tips
Beginners prioritize tissue isolation; experienced growers use multi-spore isolation for new strain development. Stable temperature and sterile environment are key to avoiding contamination.
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