In relation to the origin and spread of grasses, domestication is a recent event confined to about the last ten thousand years and to relatively few grasses. Part I of Grass Evolution and Domestication considers, from an evolutionary point of view, grass taxonomy, the origin and diversification of C4 photosynthesis, S-Z self-incompatibility and apomixis. It also includes a discussion of how the grass inflorescence and the spikelet could have originated. In Part II the origins of domestication are explored, both for cereals and for grasses which have latterly come to have either amenity or ecological significance. For the major cereals, domestication now involves not only classical plant breeding but also the application of molecular techniques to obtain new varieties with desirable characteristics. The world's three most important cereals, wheat, maize and rice, are therefore presented as model systems in an attempt to explore the interaction of plant breeding, cytogenetics and molecular biology.

Originally published in 1990, this text brings together a detailed review by acknowledged authorities of grass reproductive biology. Grasses are our most important plants whether for agriculture or conservation. Essential to contemporary awareness of grasses is an understanding of their role in sustaining ecologically fragile environments, and the relative importance of annual and perennial reproduction is examined here with particular reference to indigenous dryland grasses marginal to major deserts. Molecular biology and tissue culture allow us to intervene in reproductive systems and the issues include a fundamental revision of the concept of double fertilisation grass pollen in relation to human allergy and the prospects for developing wheat male sterility. The book concludes with an overview to assess how far evolution of the grass is coming under human control.

Unlike the situation in the major cereals, the yields of Vicia faba have not been markedly increased during the last half century. There is no single cause for this but among those that have been important is the lack of cytogenetic understanding in relation to breeding performance. Since as a consequence, little genetic variation has been available to agronomists conclusions, probably unwarranted, have been drawn about the limited prospects for the faba bean. Against such a background it has been difficult to justify the investment of research resources in the crop. The central theme of this book is that with the establishment of cytogenetic studies in Vicia faba understanding of its genetic system will develop in relation to breeding improvement and thereafter some at least, of the impediments to yield increase can steadily though not dramatically, be removed. We have distinguished between longer and shorter papers and only the former include Abstracts. The latter amplify themes in the longer papers or were written to develop particular topics at the request of the editors. G.P. Chapman S.A. Tarawali Wye College, April, 1984 VIII ACKNOWLEDGEMENTS We would like to thank the various contributors to this publication for the readiness with which they have met our various req~ests. Our thanks are due to the staff of the Centre for European Agricultural Studies for facilitating arrangements for the Seminar and to Mr. Peter Abott and Carl Zeiss (Oberkochen) Ltd. for the display of microscopes.