This 1989 volume stresses the way in which the pool of plant genetic resources provides vital raw material for producing new and improved crops.A detailed survey relates how the pool of plant genetic resources provides vital raw material for producing new and improved crops, and serves as source material for experimental biologists, plant breeders, crop scientists and conservationists.A detailed survey relates how the pool of plant genetic resources provides vital raw material for producing new and improved crops, and serves as source material for experimental biologists, plant breeders, crop scientists and conservationists.Relates how the pool of plant genetic resources provides vital raw material for producing new and improved crops, and serves as source material for experimental biologists. The first four sections provide a detailed survey of the role of plants, guidance on the size and structure of plant collections, and, finally, the principles and strategies for evaluation. The last two sections look at wild relatives of crops and the impact of new technology. The volume will be of great use to plant breeders, crop scientists, conservationists and plant biologists.Preface; Acknowledgements; Part I. Role of Genetic Resource Collections in Research and Breeding: 1. Germplasm collections and the public plant breeder K. S. Gill; 2. Germplasm collections and the private plant breeder J. S. C. Smith and D. N. Duvick; 3. Germplasm collections and the experimental biologist R. G. Palmer; Part II. Use of Collections: 4. International use of a sorghum germplasm collection K. E. Prasada Rao, M. H. Mengesha and V. G. Reddy; 5. Current use of potato collections J. G. Th. Hermsen; 6. Use of collections in cereal improvement in semi-arid areas J. P. Srivastava and A. B. Damania; 7. Limitations to the use of germplasm collections D. R. Marshall; Part III. Size and Structure of Collections: 8. The case for large collections T. T. Chang; 9. The Case for core collections A. H.lS(