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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Rejuvenation of Quercus robur. | Ann Sci For 1993 50 Suppl 1 330s-335s Elsevier INRA 330s Original article Rejuvenation of Quercus robur p Evers E Vermeer s van Eeden IBN-DLO Institute for Forestry and Nature Research Department of Urban Ecology Section of Ecophysiology POBox 23 6700 AA Wageningen The Netherlands Summary Stem sections and some branches 30 cm in length of mature Quercus were cut to induce the formation of rejuvenated shoots as initial material for in vitro propagation. Up to 100-year-old trees were used and topophysical effects were taken into account. In vitro rooting of shoot tips taken from this material showed a lower efficiency than embryo-derived cultures but the fact that rooting occurred indicates some degree of rejuvenation. The influence of stem topophysis as well as genotype remains unclear. rejuvenation I Quercus roburl topophysis adventitious neoformation Resume Rejuvenilisation de Quercus robur. Des segments de la tige principale ainsi que des branches ont été prélevés sur des chênes âgés de manière à induire la formation de pousses reju-vénilisées destinées à la multiplication in vitro. Des arbres de plus de 100 ans ont été retenus et les effets de topophysis ont été pris en compte. L enracinement in vitro de ces pousses est plus difficile que celui produit dans des cultures d embryons. Mais II indique toutefois un certain degré de rejuve-nilisation. L influence de la topophysis et du genotype de I arbre n a pas été élucidée. rejuvenilisation Quercus robur topophysis neoformation adventive INTRODUCTION Micropropagation of woody species has been reported to be limited by rootability in many surveys eg Bonga and Durzan 1987 of shoot tips harvested from adult trees. Embryo-derived cultures used as the juvenile reference in general proved to be more efficient in growth rate axillary branching and rooting than adult tree-derived cultures. Rejuvenation strategies have therefore been proposed before eg Romberger 1976 but were not so often effectuated. Also in Quercus robur
