Norway spruce (Picea abies) laccases: Characterization of a laccase in a lignin-forming tissue culture A Case Study in Planning for Sustainable Forest Medium-Term Management of Norway Spruce from Northern Germany Research on media selection and cutting effects in the cuttage of Picea abies Factors Affecting Rooting of Picea abies Shoot Cuttings and Individual Selection with High Rooting Ability EFFICIENCY IN THE FORMATION OF STABLE EMBRYOGENIC LINES AND SOMATIC EMBRYO REGENERATION IN NORWAY SPRUCE AND HYBRID LARCH Influence of Cytokinin and Ammonium Nitrate on Elongation of Adventitious Buds in Norway Spruce(Picea abies)