FDSC 310 Lecture 4: Postharvest technology lecture 4
10 Oct 2017
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Document Summary
Micro-level individual cells with specific functions ex: cell division and multiplication. Collective function ex: protection, textural quality, nutritional value, formation of large group of similar cells. Cell wall: outermost layer, composed of cellulose and other polymeric materials like hemicellulose, pectic substances, lignins etc. Main function structural support and contain all cellular components. Middle lamella: cellular membrane more rich in pectic substances, pliable, and has role in holding and binding cellular components together. Plasmalemma: semi-permeable, allows solvent. important in plant-water relationship and osmosis. Vacuole: fluid reservoir, contains solutes, soluble solids, amino acids etc. surrounded by semipermeable membrane called tonoplast. Cytoplasm: fluid matrix of macromolecules, all major metabolic activities take place in cytoplasm. Macromolecules are formed or broken down for cell function. Functions are controlled by the nucleus and coordinated through several specialized organelles located in the cytoplasmic domain. Nucleus: control center, overall metabolic activities, protein synthesis and genetic code transformation dna rna. Ribosome: contains the rna-rich organelle responsible for protein synthesis.
