Cloning, Tissue Culture & Germplasm
Cuttings, rooting, mother plants, tissue culture, sanitation, preservation, and germplasm management.
Published lessons
These pages are organized here by subject. The permanent THC-ENC IDs remain stable behind the scenes even when a clearer display title is used.
Why Cuttings Preserve Genotype
Explain why a stem cutting normally retains the donor plant’s inherited genotype while also carrying biological history that can alter later performance.
Mother-Plant Identity and Health Status
Build a mother-stock identity and health system that separates provenance, visible condition, laboratory status, and propagation performance.
Juvenility, Maturity, and Cutting Competence
Explain how ontogenetic age, tissue position, donor condition, and genotype affect a cutting’s competence to form roots.
Cutting Selection and Carbohydrate Status
Select cuttings using measured tissue quality rather than a rigid node-count recipe.
Wound Response and Adventitious Root Formation
Describe the sequence from cutting injury to adventitious-root emergence and vascular connection.
Auxin Biology and Rooting Hormones
Separate endogenous auxin biology from product-specific rooting-hormone use and evaluate dose, formulation, and genotype effects.
Rooting Media, Moisture, and Oxygen
Relate rooting-medium physical properties to water supply, gas exchange, temperature, and root development.
Humidity Management and Transpiration Control
Manage humidity as a water-loss control while preventing condensation, stagnation, and delayed acclimation.
Light During Root Initiation
Balance photosynthetic support, heat load, and water demand during root initiation.
Sanitation and Tool-Mediated Pathogen Spread
Prevent propagation tools and workflows from moving pests, pathogens, and viroids between donors and clone batches.
Rooting Success Metrics and Failure Diagnosis
Define propagation success with multiple measurable endpoints and use failure patterns to identify the limiting step.
Hardening-Off Rooted Cuttings
Transition rooted cuttings from protected propagation conditions to production conditions without exceeding hydraulic or light capacity.
Clone Intake, Quarantine, and Testing
Control incoming clone risk through identity checks, quarantine, representative testing, and documented release.
Mother-Stock Rotation and Senescence
Manage mother-stock rotation using measured propagation performance, health, identity, and crop outcomes rather than folklore about clone generations.
Tissue Culture Terminology and Workflow
Use precise tissue-culture terminology and understand the stages from donor preparation to acclimatized plant.
Explant Selection and Surface Disinfection
Select explants and design surface-disinfection trials that reduce external contamination without destroying viable tissue.
Culture Media, Plant Growth Regulators, and Genotype Effects
Explain how basal salts, carbon source, vessel atmosphere, plant growth regulators, and genotype interact in cannabis tissue culture.
Contamination, Hyperhydricity, and Culture Disorders
Differentiate contamination, hyperhydricity, browning, callus overgrowth, and other culture disorders using timing and pattern.
Ex Vitro Acclimation and Survival
Explain why in vitro plantlets require a controlled transition to ex vitro humidity, light, airflow, substrate, and microbial conditions.
Germplasm Preservation, Cryopreservation, and Clean Stock
Design a redundant germplasm system that connects identity, health, preservation method, recovery, and periodic verification.