2. IMPORTANCE OF NITROGEN METABOLISM 2. 1. Range of naturally occurring nitrogenous components in forest trees 2. 2. Gene expression and mapping 2. 3. Metabolic changes in organized and unorganized systems 2. 4. Nitrogen and nutrition 2. 5. Aspects of intermediary nitrogen metabolism 3. NITROGEN METABOLISM IN GROWTH AND DEVELOPMENT 3. 1. Precultural factors 3. 2. Callus formation 3. 3. Cell suspensions 3. 3. 1. Conifers 3. 3. 2. Acer 3. 4. Morphogenesis 3. 4. 1. Nitrogen metabolism of natural embryos 3. 4. 2. Somatic embryogenesis 3. 4. 2. 1. Sweetgum (Liquidambar styraciflua) 3. 4. 2. 2. Douglar-fir and loblolly pine 3. 4. 3. Organogenesis 4. OUTLOOK 11. CARBOHYDRATE UTILIZATION AND METABOLISM - T. A. Thorpe 325 1. INTRODUCTION 2. NUTRITIONAL ASPECTS 3. CARBOHYDRATE UPTAKE 4. CARBOHYDRATE METABOLISM 4. 1. Sucrose degradation 4. 2. Metabolism of other carbon sources 4. 3. Hexose mobilization and metabolism 4. 3. 1. Cell cycle studies 4. 3. 2. Growth studies 4. 3. 3. Organized development 4. 4. Cell wall biogenesis 4. 4. 1. Primary cell walls 4. 4. 2. Cell wall turnover 4. 4. 3. Secondary cell walls 4. 5. Carbon skeleton utilization 5. OSMOTIC ROLE 6. CONCLUDING THOUGHTS 369 12. THE USE OF IN VITRO TECHNIQUES FOR GENETIC MODIFICATIO~FOREST TREES - E. G. Kirby 1. INTRODUCTION 2. IN VITRO SELECTION 2. 1. Natural variation 2. 2. Induction of variation 2. 3. Selection techniques 2. 4. Plant regeneration 2 . • 5. Applications x 3. SOMATIC HYBRIDIZATION 3. 1.

Since the first edition of our book "Tissue Culture in Fores try" in 1982 we have witnessed remarkable advances in cell and tissue culture technologies with woody perennials. In addition to forest biologists in government, industry, and universities, we now have molecular biologists, genetic engineers, and biochemists using cell and tissue cultures of woody species routinely. There fore, the time has come for an update of the earlier edition. In our present effort to cover new developments we have expanded to three volumes: 1. General principles and Biotechnology 2. Specific Principles and Methods: Growth and Development 3. Case Histories: Gymnosperms, Angiosperms and Palms The scientific barriers to progress in tree improvement are not so much lack of foreign gene expression in plants but our current inabili ty to regenerate plants in true-to-type fashion on a mas sive and economic scale. To achieve this in the form of an appro pr iate biotechnology, cell and tissue culture will increasing ly require a better understanding of basic principles in chemistry and physics that determine structural and functional relationships among molecules and macromolecules (proteins, RNA, DNA) within cells and tissues. These principles and their relationship with the culture medium and its physical environment, principles of clonal propagation, and genetic variation and ultrastructure are discussed in volume one.

2. 2. Plant materials 2. 3. Pregrowth conditions 2. 4. Cryoprotectant treatment 2. 5. Freezing 2. 5. 1. Slow freezing 2. 5. 2. Rapid freezing 2. 5. 3. Droplet freezing 2. 6. Storage 2. 7. Thawing 2. 8. Viability testing 2. 9. Post-thaw regrowth 3. EXAMPLES OF CRYOPRESERVATION OF WOODY PLANT MATERIAL 4. POTENTIAL APPLICATION OF CRYOPRESERVATION IN TREE IMPROVEMENT 17. NURSERY HANDLING OF PROPAGULES - J. A. Driver, and 320 G. R. L. Suttle 1. INTRODUCTION 2. COMMERCIAL NURSERY NEEDS VS. LABORATORY PRACTICE 3. SEASONALITY OF GROWTH AND PRODUCTION CYCLES 4. MICROPROPAGATION OPTIONS 4. 1. Trends in commercial micropropagation 4. 1. 1. Contract micropropagation 5. FACTORS AFFECTING SURVIVAL AND GROWTH 5. 1. Hardening of propagules in vitro 5. 2. Greenhouse considerationS------ 5. 3. Field planting 5. 4. New approaches: Direct field rooting 5. 4. 1. Pretreatment in vitro 5. 4. 2. Root induction 5. 4. 3. Field placement 18. MYCORRHIZAE - R. K. Dixon, and D. H. Marx 336 1. INTRODUCTION 2. ROLE OF MYCORRHIZAE IN TREE GROWTH AND DEVELOPMENT 3. PRODUCTION AND APPLICATION OF ECTOMYCORRHIZAL FUNGUS INOCULUM 3. 1. Bareroot stock 3. 2. Container-grown stock 4. FIELD TRIALS WITH ECTOMYCORRHIZAL PLANTING STOCK 5. PRODUCTION AND APPLICATION OF ENDOMYCORRHIZAL INOCULUM 6. FIELD TRIALS WITH ENDOMYCORRHIZAL 7. RESEARCH OPPORTUNITIES 8. SUMMARY 351 19. TISSUE CULTURE APPLICATIUN TO FOREST PATHOLOGY AND PEST CONTROL - A. M. Diner, and D. F. Karnosky 1. INTRODUCTION 2. HOST AND PATHOGEN: CULTURE AND CHALLENGE 2. 1.

This symposium is the third in a series featuring the propaga tion of higher plants through tissue culture. The first of these symposia, entitled "A Bridge Between Research and Application," was held at the University in 1978 and was published by the Technical Information Center, Department of Energy. The second symposium, on "Emerging Technologies and Strategies," was held in 1980 and pub lished as a special issue of Environmental and Experimental Botany. One of the aims of these symposia was to examine the current state of-the-art in tissue culture technology and to relate this state of technology to practical, applied, and commercial interests. Thus, the third of this series on development and variation focused on embryogenesis in culture: how to recognize it, factors which affect embryogenesis, use of embryogenic systems, etc.; and variability from culture. A special session on woody species again emphasized somatic embryogenesis as a means of rapid propagation. This volume emphasizes tissue culture of forest trees. All of these areas, we feel, are breakthrough areas in which significant progress is expected in the next few years.

The second edition of Experiments in Plant Tissue Culture makes available new information that has resulted from recent advances in the applications of plant tissue culture techniques to agriculture and industry. This comprehensive laboratory text takes the reader through a graded series of experimental protocols and also provides an introductory review of each topic. Topics include: a plant tissue culture laboratory, aseptic techniques, nutritional components of media, callus induction, organ formation, xylem cell differentiation, root cultures, cell suspensions, micropropagation, embryogenesis, isolation and fusion of protoplasts, haploid cultures, storage of plant genetic resources, secondary metabolite production, and quantification of procedures. This volume offers all of the basic experimental methods for the major research areas of plant tissue culture, and it will be invaluable to undergraduates and research investigators in the plant sciences.

Plant Cell and Tissue Culture gives an exhaustive account of plant cell culture and genetic transformation, including detailed chapters on all major field and plantation crops. Part A presents a comprehensive coverage of all necessary laboratory techniques for the initiation, nutrition, maintenance and storage of plant cell and tissue cultures, including discussions on these topics, as well as on morphogenesis and regeneration, meristem and shoot tip culture, plant protoplasts, mutant cell lines, variation in tissue cultures, isogenic lines, fertilization control, cryopreservation, transformation, and the production of secondary metabolites. Part B then proceeds into detail on the specific in vitro culture of specific crops, including cereals, legumes, vegetables, potatoes, other roots and tubers, oilseeds, temperate fruits, tropical fruits, plantation crops, forest trees and ornamentals. Plant Cell and Tissue Culture is, and is likely to remain, the laboratory manual of choice, as well as a source of inspiration and a guide to all workers in the field.