Domestication, Dispersion, Selection and Hybridization of Cultivated Plants.- Scientific Breeding in the 20th Century and Future Goals.- DNA and the Origin of Variation.- Mendelian Genetics and Linkage Maps.- Gene Expression and Selection of Major Genes.- Quantitative Genetics and Genomic Selection.- Genotype × Environment Interactions and Selection Environments.- Genome Evolution and Polyploidy.- Genetic Structure of Landraces.- Open-Pollinated and Synthetic Cultivars from Population Improvement.- Clonal Cultivars from Multistage Multitrait Selection.- Hybrid Cultivars from Inbreeding and Crossbreeding.- Inbred Line Cultivars and Mixtures from Hybridization and Inbreeding.- Genetic Basis of Heterosis and Inbred Line versus Hybrid Cultivars.- Use of Sexual Reproduction in Base Broadening and Introgression.- Mutation Breeding.- Genetically Modified Crops.- Durable Resistance to Pests and Diseases.- Way Ahead.
John
E. Bradshaw, PhD, spent his whole professional life as plant breeder and
geneticist at the Scottish Crop Research Institute (SCRI, formerly the Scottish
Plant Breeding Station and now the James Hutton Institute). He completed his
career as Head of Potato Breeding and Manager of the Potato Genetics Programme,
funded by the Scottish Government. He has worked on barley, brassicas (kale,
swedes and turnips) and potatoes; doing research on the applications of
genetics to plant breeding methods as well as breeding two kale and three swede
cultivars, and contributing to the breeding of four more swedes, a turnip, and
27 potatoes. His research covered methods of kale population
improvement, the genetic basis of heterosis in swedes, the theory and practice
of linkage and QTL analysis in tetraploid potatoes, and breeding for
quantitative resistance to pests and diseases (clubroot in kale, powdery mildew
in swedes, and late blight and cyst nematodes in potatoes). Dr. Bradshaw is an
Honorary Fellow of the Indian Potato Association and an Honorary Associate of
the James Hutton Institute. He also holds Honorary Membership of EUCARPIA,
European Association for Research on Plant Breeding (in recognition of his
outstanding activity in the field of plant breeding science, and his
considerable contributions to improving international contacts in plant
breeding research). He was awarded the prestigious 2010 British Potato Industry
Award in recognition of his outstanding contribution to potato research and
knowledge transfer. He has published 93 refereed papers in peer reviewed
journals, 53 other articles and 10 book chapters. He has also edited one and
co-edited two books including Root and Tuber Crops (Book 7 of the Handbook of
Plant Breeding Series) with Springer.
The United Nations predicts that the global human population will rise from the 7 billion reached in 2011 to 9 billion by 2050, and that world food production will need to increase between 70 and 100 per cent in just 40 years. Most of this increase will need to come from bridging the yield gap between what is currently achieved per unit of land and what should be possible in future, given the most appropriate farming methods and storage of food and the availability of suitably adapted cultivars, including adaptation to climate change. Breeding such cultivars is the challenge for a new generation of plant breeders who will need to decide what germplasm and which breeding methods to use, and the types of cultivar to produce. They will also need to consider new opportunities made possible by technological advances in the manipulation of DNA, the chemical basis of heredity. This book aims to help them in their endeavours by reviewing past achievements, currently successful practices and emerging methods and techniques. Theoretical considerations are presented when thought helpful. The book is divided into four parts: Part I is an historical introduction finishing with future goals; Part II deals with the origin, recognition and selection of genetic variants that affect qualitative and quantitative traits in a desired way, and concludes with genome evolution and polyploidy; Part III explains how the mating systems of crop species determine the genetic structures of their landraces and hence the types of high yielding cultivars that have been bred from them: synthetic (including open-pollinated), clonal, hybrid and inbred line (including mixtures); Part IV considers three complementary options for future progress: use of sexual reproduction in further conventional breeding, base broadening and introgression; mutation breeding; and genetically modified crops. It concludes with strategies for achieving durable resistance to pests and diseases.