Somatic Cell Genetics of Woody Plants : Proceedings of the IUFRO Working Party S2. 04–07 Somatic Cell Genetics, Held in Grosshansdorf, Federal Republic of Germany, August 10–13, 1987

Most forest tree species were considered recalcitrant a decade ago, but now with the improved in vitro techniques some progress has been made towards culture-of tree species. Micro­ propagation has been achieved from the juvenile tissues of a number of forest tree species. On the other hand, tissues from most mature trees are still very difficult to grow and differen­ tiate in vitro. Nevertheless, there has been slow but steady progress in the application of tissue culture technology for culture of tissues, organs, cells and protoplasts of tree species. As compared to most agricultural crops, and herbaceous plant species, trees are a different lot. They have long gene­ ration cycles. They are highly heterozygous and have a large reservoir of genetic variability. Because of this genetic variability, their response in vitro is also variable. On a single medium, the response of tissues from different trees (genotypes) of a single species may be quite different: some responding by induction of growth and differentiation, while others showing minimal or no growth at all. That makes the somatic cell genetics of woody plants somewhat difficult, but at the same time interesting. Front Matter....Pages i-xxi Development and Characterization of in Vitro Embryogenic Systems in Conifers....Pages 1-18 Studies on Embryogenesis of Woody Plants in China....Pages 19-28 Morphological Definition of Phenocritical Period for Initiation of Haploid Embryogenic Tissue From Explants of Larix Decidua ....Pages 29-38 Production of Haploid Plantlets in Cultures of Unpolinated Ovules of Hevea Brasiliensis Muell.-ARG....Pages 39-44 Somatic embryogenesis in tissue cultures of walnut ( Juglans nigra, J. major and hybrids J. nigra * J. regia ).....Pages 45-49 In Vitro Embryogenic Callus Formation in Chimonanthus ....Pages 51-52 Plant Regeneration of Horse Chestnut by in Vitro Culture....Pages 53-54 A Model System for Gene Transfer in Conifers: European Larch and Agrobacterium ....Pages 55-63 Regeneration and Transformation of Apple Plants Using Wild-Type and Engineered Plasmids in Agrobacterium SPP....Pages 65-71 Expression of an Herbicide Tolerance Gene in Young Plants of a Transgenic Hybrid Poplar Clone....Pages 73-80 Transformation of Hybrids Populus Tremula X P.Alba by Agrobacterium Tumefaciens ....Pages 81-81 Gene Transfer in Woody Plants: Perspectives and Limitations....Pages 83-101 Somatic Cell Genetic Research in Forestry: Integration of Cytogenetics, Tissue Culture, and Molecular Genetics....Pages 103-118 Differential Norms of Reaction in Tissue Culture of Birch....Pages 119-125 Determination of Plantlet Regeneration Capacity of Selected Aspen Clones in Vitro ....Pages 127-135 Suspension Culture of the Dipterocarp Shorea Roxburghii G. Don.....Pages 137-141 Isozyme Analysis of Micropropagated Betula Pendula Roth....Pages 143-145 Tissue Culture Studies on Mahogany Tree, Sweitenia ....Pages 147-153 Attempts to Micropropagate Mature Larix Decidua Mill....Pages 155-168 Protoplast Culture of Woody Rosaceae and a Comparison to Herbaceous Rosaceae....Pages 169-172 Differential Growth Response of Aspen Clones Stored at Sub-Zero Temperatures....Pages 173-180 Screening for Resistance to Hypoxylon Mammatum in Populus Tremuloides Callus and Micropropagated Plantlets....Pages 181-181 Increased Herbicide Tolerance of in Vitro Selected Hybrid Poplar....Pages 183-189 The Occurrence of Endogenous Bacteria in Birch Shoot Cultures....Pages 191-193 Establishment of a Sterile Foam Cultivation System: Elimination of Formaldehyde....Pages 195-199 Testing and Deployment of Brave New Plantlings....Pages 201-209 Rules Governing the Release of Forest Reproductive Material Derived by in Vitro -Culture....Pages 211-219 Guidelines for Research and Development in Biotechnology....Pages 221-225 Proceedings of the IUFRO Working Party S2. 04-07 Somatic Cell Genetics, held in Grosshansdorf, FRG, August 10-13, 1987