Charles E. Hess Department of Environmental Horticulture University of California Davis, CA 95616 Research in the biology of adventitious root formation has a special place in science. It provides an excellent forum in which to pursue fundamental research on the regulation of plant growth and development. At the same time the results of the research have been quickly applied by commercial plant propagators, agronomists, foresters and horticulturists (see the chapter by Kovar and Kuchenbuch, by Ritchie, and by Davies and coworkers in this volume). In an era when there is great interest in speeding technology transfer, the experiences gained in research in adventitious root formation may provide useful examples for other areas of science. Interaction between the fundamental and the applied have been and continue to be facilitated by the establishment, in 1951, of the Plant Propagators' Society, which has evolved into the International Plant Propagators' Society, with active programs in six regions around the world. It is a unique organization which brings together researchers in universities, botanical gardens and arboreta, and commercial plant propagators. In this synergistic environment new knowledge is rapidly transferred and new ideas for fundamental research evolve from the presentations and discussions by experienced plant propagators. In the past 50 years, based on research related to the biology of adventitious root formation, advances in plant propagation have been made on two major fronts.

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Special Lecture: The Origin, Diversity, and Biology of Shoot-Borne Roots; P.W. Barlow. The Commercial Importance of Adventitious Rooting: Commercial Application of Adventitious Rooting to Forestry; G.A. Ritchie. Infrastructure for Research: Model Systems for Studying Adventitious Root Formation; S.G. Ernst. Setting the Stage for Rooting: Novel Experimental Systems for Determining Cellular Competence and Determination; D. Mohnen. Induction of Rooting: Auxin Metabolism and Adventitious Root Initiation; D. Blakesley. Root Development and Plant Growth: Modeling Root System Morphology in Rice; S. Morita, J. Abe. Special Chapter: A Historical Evaluation of Adventitious Rooting Research to 1993; B.E. Haissig, T.D. Davis. Epilogue: Research on Adventitious Rooting; W.P. Hackett, J.R. Murray. 12 additional articles. Index.