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註釋Origins and development of cultivated plants.Breeding aims. Scientific breeding. Yield. Climate. Uniformity. Competition and consumer demand. New techniques. Breeding methods: general. Protection. Isolation. Emasculation. Self-pollination. Cross-pollination. Selection in inbreeders. Selection in outbreeders. Quantitative inheritance. Polyploid inheritance. Breeding methods: special. Incompatibility. Interspecific sterility. Male sterility. Heterosis. Mutation breeding. Induced polyploidy. Chromosome manipulation. Disease resistance. Environmental control. Distribution and maintenance of new varieties. Breeding principles. Fitness. Adaptability. Conservation of genetic variability. Centres of diversity. The future.