Biotechnology And Its Application Part 1

Biotechnology

Biotechnology deals with techniques of using live organisms or enzymes from organisms to produce products and processes useful to humans. The applications of biotechnology include therapeutics, diagnostics, genetically modified crops for agriculture, processed food, bioremediation, waste treatment, and energy production. Three critical research areas of biotechnology are:

(i) Providing the best catalyst in the form of improved organism usually a microbe or pure enzyme. (ii) Creating optimal conditions through engineering for a catalyst to act, and (iii) Downstream processing technologies to purify the protein/organic compound.

Biotechnological applications in agriculture

Let us take a look at the three options that can be thought for increasing food production (i) agro-chemical based agriculture; (ii) organic agriculture; and (iii) genetically engineered crop-based agriculture.

Green Revolution’s Limitations:

• Tripled food supply, but insufficient for growing population.
• Reliance on expensive agrochemicals hindered developing nations.
• Traditional breeding couldn’t keep up with demand.

Tissue Culture:

• Growing whole plants from explants (plant parts) in sterile nutrient media.
• Relies on totipotency (ability of a cell to develop into a whole plant).
• Enables mass propagation (micro-propagation) of genetically identical plants (somaclones).
• Used to produce virus-free plants from meristems.
• Somatic hybridization: fusing protoplasts (cells without cell walls) from different plants to create hybrids (e.g., pomato).

Genetic Modification (GM) as an Alternative:

• Creates Genetically Modified Organisms (GMOs).
• Benefits:
  • Increased abiotic stress tolerance (cold, drought, etc.).
  • Reduced pesticide use (pest-resistant crops).
  • Reduced post-harvest losses.
  • Improved mineral use efficiency.
  • Enhanced nutritional value (e.g., golden rice).
• Applications in industry (starches, fuels, pharmaceuticals).

Bt Toxin and Pest-Resistant Plants:

• Bacillus thuringiensis (Bt) produces insecticidal proteins.
• Bt toxin genes are inserted into plants to create biopesticides (e.g., Bt cotton).
• Toxin is inactive until ingested by insect, then activated by alkaline gut pH.
• Different Bt toxins target different insect groups.

RNA Interference (RNAi) and Pest Resistance:

• Natural cellular defense mechanism silencing specific mRNA.
• Used to create nematode-resistant plants.
• Nematode-specific genes introduced into plants produce sense and antisense RNA.
• These form dsRNA, triggering RNAi and silencing nematode mRNA.