Agar Medium Preparation and Tissue Isolation
Maintaining pure mushroom genetic strains requires isolating vegetative tissue from healthy, vigorous young fruiting bodies under a sterile laminar airflow hood.
Tissue explants are transferred onto sterile nutrient agar slants where mycelium grows out axenically without bacterial or mold contamination.
- Culture media: Potato Dextrose Agar (PDA) or Malt Extract Agar (MEA) autoclaved at 121 degrees Celsius for 20 minutes.
- Tissue isolation: Tear the mushroom stem longitudinally under sterile conditions and excise a tiny inner tissue fragment with a flamed scalpel.
- Incubation parameters: Incubate inoculated culture tubes in darkness at 22 to 25 degrees Celsius for 7 to 10 days until pure white mycelium covers the agar surface.
- Sub-culturing limits: Limit serial sub-culturing to 3 to 4 generations to avoid strain degeneration and loss of fruiting vigor.
Culture Preservation and Master Spawn Generation
Pure culture slants are maintained in refrigerated storage and scaled up onto sterilized grain substrates to generate master mother spawn.
Strict sterile technique prevents competitor green molds (Trichoderma) from contaminating mother cultures.
- Refrigerated storage: Store mature agar slant cultures at 2 to 4 degrees Celsius, renewing cultures every 4 to 6 months.
- Mother spawn inoculation: Transfer agar culture plugs into bottles of sterilized wheat or sorghum grains under laminar airflow.
- Mycelium run in grains: Shake grain bottles periodically to distribute colonized grains evenly and achieve rapid full colonization.
- Certified sources: Procure authenticated master cultures from ICAR-DMR Solan or state agricultural university mushroom laboratories.
Official source
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Directorate of Mushroom Research (ICAR-DMR) ↗Related on KisanPe
Common questions
What is the primary purpose of mushroom tissue culture?
It preserves pure, disease-free vegetative mycelium of elite mushroom strains for producing commercial grain spawn.
Which nutrient agar medium is most commonly used for mushroom culture?
Potato Dextrose Agar (PDA) and Malt Extract Agar (MEA) are the standard media for culturing edible mushroom mycelium.
How should pure mushroom culture slants be stored?
Store mature agar slants in a clean refrigerator at 2 to 4 degrees Celsius to slow metabolism and maintain viability for several months.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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