DIY Microclonal Laboratory: Plant Tissue Culture at Home

Introduction

The author grows real wasabi in Moscow and plans to build a farm for its cultivation. Since wasabi seedlings cannot be purchased in Russia, he organized a microclonal laboratory for independently producing planting material.

What Is Microclonal Propagation?

Microclonal propagation is a method of vegetative reproduction under sterile conditions that allows obtaining new plants from small tissue samples. The method is based on the ability of plant cells to exhibit totipotency — the capacity of cells to differentiate into any cell type through division.

The author provides an example: from a single wasabi bud, you can get 3 micro-shoots per month. Each of them, transplanted onto a new medium, will produce another 3 shoots. Over a year, this geometric progression yields 3¹² = 531,441 plants.

Key Stages

• Bud extraction and surface disinfection
• Placement on hormone-rich medium in sterile conditions
• Shoot multiplication through hormone manipulation
• Root generation using different hormone formulations
• Acclimatization to natural conditions

Advantages of Microcloning for Wasabi

• Wasabi seeds quickly lose viability and require stratification (prolonged cooling)
• Propagation by offsets accumulates diseases from the parent (no more than 3 generations)
• Microcloning in sterile conditions produces healthy material without bacterial contamination
• Allows obtaining plants regardless of season

Laboratory Premises

The laboratory is distributed across two locations:

• At home: Mixing solutions, sterilization
• In an outbuilding: Laminar flow hood and growing cabinet for explants

Laminar Flow Hood

The laminar flow hood ensures sterility through a constant stream of filtered air. The design includes:

• Pre-filter: Class F5, 287×287×48 mm
• HEPA filter: H14 class, 305×610×150 mm — the most expensive component
• Centrifugal radial fan: 800 m³/h capacity
• UV lamp: 8W for disinfection (minimum 1 hour of sterilization before work)
• Housing: Furniture-grade plywood with a glass lifting lid

Recommended airflow velocity: 0.4–0.6 m/s at the filter outlet.

The hood consists of three chambers: Box 1 houses the fan and draws air through the pre-filter; Box 2 is a pressure equalization chamber (~30 cm height); Box 3 houses the HEPA filter, with all seams sealed with caulk.

Testing results: No contamination was detected when sterile culture medium was exposed for 10 minutes, validated across over 1,000 introduction attempts.

Growing Cabinet

A shelving unit with LED strip lights provides approximately 3,000 lux of illumination while maintaining a temperature of 24°C through air conditioning and a heater. Callus cultures can grow in darkness; shoot multiplication requires light.

Remote Management System

Based on Raspberry Pi + Home Assistant with Zigbee-compatible devices. Functions include UV lamp scheduling, ventilation control, and dry-heat sterilizer activation.

Equipment

Sterilization Equipment

Autoclave: A modified household pressure canner (the type used for food preservation). At 121°C, 15 minutes is sufficient for sterilizing culture media.

Filtration sterilization: For heat-sensitive substances (phytohormones, vitamins), 0.22 µm membrane filters or disposable syringe filters are used.

Preparation and Analysis Tools

• Magnetic stirrer with heating for dissolving and mixing components
• Stereo microscope (7×–50×) for working with plant tissues
• Optical microscope (up to 1000×) for detecting bacteria and fungi
• Pipettor: 10–100 µL range for precise phytohormone dosing
• pH meter: For monitoring solution acidity (requires calibration)
• Scales: Kitchen scales and jewelry scales (50g, 200g, 500g)
• Measuring glassware: 0.5L and 2L flasks for primary use
• Scalpels with replaceable blades, tweezers, alcohol lamp
• Dry-heat sterilizer for instrument sterilization
• Spray bottle with 70% ethanol for surface disinfection
• Dedicated refrigerator for storing hormones, vitamins, and antibiotics

Consumables

Culture Media

Murashige and Skoog (MS) Medium: The industry standard. The author recommends purchasing pre-made media from established manufacturers initially, noting early failures with AliExpress sources.

Phytohormones

6-BAP (6-Benzylaminopurine): 1 gram supplies 1,000 liters at a 1 mg/L concentration. Requires precision in measurements and plays a critical role in shoot/root differentiation.

Disinfection Reagents

• Sodium hypochlorite (from household bleach) — requires careful concentration management
• Ethanol (pre-treatment)
• Hydrogen peroxide
• The author developed a homemade equivalent of Plant Preservative Mixture (PPM™), containing a biocide effective against bacteria and fungi without tissue damage, which remains effective through autoclaving

Containers and Supplies

• 30 mL plastic sauce containers as primary culture vessels
• Autoclave bags and aluminum foil for sterilization packaging
• Eppendorf-type 1.5 mL microtubes for hormone solution portioning
• Pipette tips in bulk (1,000+ units) with autoclavable racks
• Syringes for measurement and delivery
• Disposable #11 scalpel blades

Recommendations for Beginners

• Thoroughly study materials on sterility before starting work
• Buy pre-made culture media from reputable manufacturers
• Find published protocols for your target plant (especially English-language scientific sources)
• Use high-quality reagents; compare cheap alternatives against reference standards before cutting costs
• Monitor precision — pH changes after autoclaving
• Ensure personal safety when working with potentially hazardous substances

Current Results

Wasabi

Explants have been obtained, but the battle with bacterial contamination continues. Over 50 experiments have been conducted. Successfully isolated tissue cultures demonstrate growth but succumb to pathogenic bacteria. The author remains committed to finding a solution and reports incremental improvement in contamination management protocols.

Strawberry (Delizzimo F1)

Successfully propagated by microcloning on the first attempt. Starting from 5 seed-derived seedlings, 60 containers were obtained after hormonally-induced branching and micro-rosette division. The next projected cycle: 720 containers following geometric progression. Root-generation hormone formulations and hardening protocols are being prepared. The author jokes about potential oversupply and offers healthy disease-free strawberry seedlings to interested parties.

Blue Cheese Mold

A Penicillium roqueforti culture was successfully isolated from imported Italian gorgonzola. Multiple experimental cheese batches were produced by Christmas. Four variations are in development with two additional experiments queued. Lactic acid bacterial isolation has been deferred as it requires identification and separation of 3–4 bacterial species.

Author contact: Website: cyber-dacha.com | Telegram: @cyberdacha