Module VI is your capstone: move from principles to practice. Five Ethiopian crops – each with a unique biochemical story. You will analyse real challenges (pre‑harvest stress, post‑harvest losses, processing quality) and propose solutions rooted in metabolism, enzymology, and plant physiology.
The module explores mango ripening & export (6.3), teff fermentation & injera (6.4), and flower ethylene & cold chain (6.5) – but your group will go deeper into your crop.
Start from the module 6 page – absorb the context. Then expand:
• primary / secondary metabolites (caffeine in coffee, starches in enset/teff, pigments in mango/flowers)
• developmental shifts: ripening, senescence, fermentation
• key pathways: ethylene biosynthesis, starch‑sugar conversion, phenylpropanoids, fermentation microbiology
Focus on biochemically rooted hurdles along the value chain:
pre‑harvest – drought, heat, disease affecting metabolism?
post‑harvest – rapid senescence, chilling injury, microbial spoilage?
processing – inconsistent fermentation (teff), loss of volatiles (mango, coffee), poor vase life (flowers).
This is the heart. For each challenge, pinpoint the major biochemical concept that can unlock a solution. Examples:
• flower wilting → ethylene biosynthesis & inhibitors (1‑MCP, STS)
• uneven mango ripening → climacteric respiration control (modified atmospheres)
• poor injera texture → microbial starch/protein degradation (fermentation management)
required sections: title · crop introduction · overview of crop biochemistry · major challenges (2‑3) · biochemical solutions (mechanism‑based) · conclusion · references.
be specific: explain how the solution works at molecular level| group | crop | core biochemical theme (from mod6) | intro link |
|---|---|---|---|
| 1 | ☕ coffee | seed biochemistry, caffeine, chlorogenic acids, post‑harvest fermentation (flavour development) | view module context → |
| 2 | 🌿 enset | starch accumulation, fermentation (kocho), cell wall polysaccharides, stress tolerance | view module context → |
| 3 | 🥭 mango | climacteric ripening, ethylene, cell wall softening, aroma volatiles, export quality (6.3) | view module context → |
| 4 | 🌾 teff | grain proteins (gluten‑free), fermentation microbiology, injera texture, mineral bioavailability (6.4) | view module context → |
| 5 | 🌹 flower | ethylene sensitivity, petal senescence, preservatives, cold chain / starvation metabolism (6.5) | view module context → |
👉 Use the module page as your springboard – each crop has a short intro there. Expand with independent research.
💡 example: group 5 – flower export chain
challenge: premature wilting during air transport.
biochemistry concept: ethylene biosynthesis (ACC synthase & ACC oxidase) – a hormonal cascade that triggers senescence.
solution: treat with 1‑methylcyclopropene (1‑MCP) to block ethylene receptors; optimise cold chain to slow respiration and ethylene production. Explain why cold temperature reduces ACC oxidase activity.
📘 your task: build a similar logic for your crop – mechanism first.
🧑🏫 instructor: Mitiku Munanenda, Dilla University 📧 [email protected] · office Wed 10‑12 / Thu 14‑16
❗ remember: your case study must show overview of crop biochemistry, major challenges AND biochemistry‑based solutions. The presentation (Monday) should be concise, visual, and engage the class.