Lesson Notes By Weeks and Term v4 - SHS 1

Lesson Video

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Performance objectives

• Describe what tissue culture is.
• Explain its importance for cereals, legumes, and tuber crops.
• Identify the benefits of using tissue culture.
• Discuss the challenges of tissue culture in Ghana.

Lesson summary

In Ghana, our farmers often face challenges like diseases wiping out their cassava farms, or not having enough clean yam setts to plant for the next season. Imagine if we could produce thousands of healthy, disease-free yam or cassava plants from just one tiny piece of a mother plant, all within a laboratory, and in a very short time. This is not science fiction; it is a technology called Tissue Culture. This lesson will introduce you to this powerful tool, explaining how it works and why it is becoming so important for improving the production of our staple foods like maize, cowpea, and yam, ultimately boosting our nation's food security and farmers' incomes.

Lesson notes

This section breaks down the essential knowledge needed to understand tissue culture. A. What is Tissue Culture?

Tissue Culture (also known as *micropropagation*) is a modern agricultural technique where very small pieces of a plant (like a leaf, stem, root, or even a single cell) are grown in a sterile, artificial environment, usually in a laboratory. These small pieces are placed in a container (like a test tube or jar) with a special nutrient jelly (medium) that contains everything the plant needs to grow into a whole new plantlet.

The Main Principle: Totipotency This whole process is possible because of a characteristic of plant cells called totipotency. Definition: Totipotency is the ability of a single plant cell to grow and develop into a complete, whole plant, provided it is given the right conditions (nutrients, hormones, light, and temperature). Analogy: Think of it this way: every single cell in a yam plant is like a seed that contains the full blueprint to grow a new yam plant. Tissue culture is the science of unlocking that potential. B. Key Terminologies Explant: This is the small piece of the parent plant that is used to start the culture. It could be a piece of a leaf, stem tip, root, or bud. For producing disease-free plants, scientists often use the apical meristem (the very tip of a growing shoot), as it is usually free of viruses. Nutrient Medium: This is the jelly-like substance (often called agar medium) that the explant is placed on. It is a carefully prepared mixture of water, sugars (for energy), mineral salts (like NPK), vitamins, and plant hormones (like auxins and cytokinins) that control growth. Sterile (Aseptic) Conditions: This means an environment that is completely free from microorganisms like bacteria and fungi. The work must be done in a very clean space (like a laminar flow hood) because these microbes can easily contaminate and kill the tiny explant. C. The Process of Tissue Culture (Simplified Steps)

Let's imagine we are creating disease-free cassava plantlets.

Evaluation guide

• Describe the use and importance of tissue culture in arable crop (cereals, legumes,
• and tuber crops) enterprises .
• Problem- Based Learning: Learners in mixed -gender groups (of
• are tasked to research