Understand what culture media do, what major components mean, and why context matters.
Culture medium supplies a controlled chemical environment that can include mineral nutrients, a carbon source, vitamins or organic supplements, plant growth regulators, water, and—when a solid or semi-solid system is used—a gelling agent. Composition is selected for the plant material and developmental objective.
Start lesson →Water is the largest component by volume, while basal formulations provide macro- and micronutrients in defined proportions. Common formulations include Murashige and Skoog (MS), Gamborg B5, Woody Plant Medium (WPM), and others.
Start lesson →In-vitro cultures may receive vitamins and a carbohydrate source because their photosynthetic capacity and culture environment may not support fully autotrophic growth. Sucrose is commonly used in many protocols, but exact amounts are protocol-specific.
Start lesson →Agar, gellan-type products, and other gelling systems can create semi-solid support. Gel strength and chemistry influence water availability, diffusion, handling, and sometimes culture morphology, so the gelling agent is a meaningful part of a protocol.
Start lesson →pH describes hydrogen-ion activity and influences nutrient chemistry, gel behavior, and plant culture conditions. Tissue-culture protocols often specify a target pH range before sterilization or final preparation, but the exact value belongs to the reviewed protocol rather than a universal rule.
Start lesson →Murashige and Skoog (MS) medium is widely used and relatively high in total mineral salts; Woody Plant Medium (WPM) was developed for woody plant culture and differs substantially in nutrient composition. Neither name tells you that the medium is automatically correct for your exact plant.
Start lesson →Plant growth regulators (PGRs) are compounds used in culture to influence developmental responses. Auxins and cytokinins are especially important in many organogenesis and micropropagation systems, but gibberellins, abscisic acid-related treatments, ethylene-related effects, and other regulators can also matter.
Start lesson →Classic tissue-culture experiments showed that changing auxin and cytokinin balance can strongly influence organ development. That historical model is foundational, but modern regeneration biology is more complex than a simple high/low ratio rule.
Start lesson →A concentration only has meaning when the chemical identity, units, stock preparation, final volume, plant material, stage, and protocol are known. A small unit error can change the intended treatment by orders of magnitude.
Start lesson →8 scored questions · results shown after submission.
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