Unit 2218: Plant Breeding Fundamentals and Applications

1. Introduction to Plant Breeding

• Definition and scope of plant breeding
• Importance in agriculture and food security
• Historical evolution of plant breeding
  • Early domestication and selection
  • Mendelian genetics and its impact
  • Modern breeding developments

2. Genetic Principles in Plant Breeding

• Basic genetics overview
  • Genes, alleles, and chromosomes
  • Gene inheritance patterns (Mendelian and non-Mendelian)
• Genetic variation sources
  • Mutation
  • Recombination
  • Polyploidy
• Genotype vs. phenotype: definitions and implications

3. Plant Reproduction and Pollination

• Modes of plant reproduction
  • Sexual (self-pollination and cross-pollination)
  • Asexual (vegetative propagation)
• Pollination mechanisms
  • Self-pollination: advantages and disadvantages
  • Cross-pollination: vectors and benefits
• Hybridization concepts
  • Creating hybrids
  • Hybrid vigor (heterosis)

4. Selection Methods in Plant Breeding

• Mass selection: procedure and applications
• Progeny selection: methodology and benefits
• Marker-assisted selection (MAS)
  • Genetic markers and their use
  • Advantages over traditional methods

5. Hybridization in Plant Breeding

• Importance of hybrids in crop improvement
• Techniques for hybridization
  • Controlled pollination
  • Use of male sterility
• Advantages and limitations of hybrids

6. Plant Breeding for Disease Resistance

• Types of disease resistance
  • Vertical and horizontal resistance
• Breeding strategies for resistance
  • Conventional selection
  • Genetic modification approaches
• Case studies of disease-resistant crops

7. Biotechnology in Plant Breeding

• Overview of biotechnology applications
• Genetic engineering in plants
• Gene editing technologies
  • CRISPR/Cas9: mechanism and applications
• Impact on crop improvement and challenges

8. Seed Production and Distribution

• Seed production processes
  • Foundation, registered, and certified seed
• Seed storage and conservation methods
• Seed quality control and certification
• Distribution channels and farmer access

9. Environmental Impacts of Plant Breeding

• Effects on biodiversity
• Role in sustainable agriculture
• Risks and ethical considerations of GMOs
• Regulatory frameworks and biosafety

10. Future Trends in Plant Breeding

• Precision breeding technologies
• Genomic selection and its advantages
• Integration of big data and bioinformatics
• Prospects for climate-resilient crops