Part Ⅰ Introductory Topics 1 Introduction 2 Crop Germplasm 3 Reproductive System 4 Male Sterility 5 Self-incompatibility 6 Techniques of Artificial Hybridization 7 Genetic Basis of Plant Breeding 8 Selection 9 Interspecific and Intergenertic Hybridization 10 Plant variety protection Part Ⅱ Methods of Conventional Breeding 11 Pure-Line Selection 12 Mass Selection 13 Pedigree Method 14 Bulk-population Method 15 Backcross Method 16 Recurrent Selection 17 Mutation Breeding 18 Polyploid Breeding 19 Disease Resistance Breeding 20 Insect Resistance Breeding 21 Drought Resistance and Salt Tolerance Part Ⅲ : In vitro plant breeding 22 Introduction 23 Micropropagation 24 Haploid Plant Production In Vitro 25 In Vitro Pollination and Fertilization 26 Somatic Hybridization Using Protoplast Technology 27 Cell Culture and Selection of Desirable Traits 28 Genetic Engineering 29 Molecular Plant Breeding