Establishment and Optimization of plant regeneration of Hybrid larch(L.gmelinii 10×L.kaempferi 13) Effects of Auxin on the Rooting Ability of Hybrid Larch Cuttings Study on a Complete Set of Larch Hybrid Mass Propagation THE SOLUBLE PROTEIN ANALYSIS OF HYBRID LARCH DURING CUTTING ROOTINGS Genetic Variations in Pulpwood Qualities of F2 Generation of Open-Pollinated Larch Hybrid Families and Multi-Traits Selection Research on the Shoot Growth and Bud Propagation In Vitro Culture Somatic Embryogenesis and Plantlet Regeneration from Immature Zygotic Embryos of Hybrid Larch