PROPAGATION METHOD FOR SOFT CUTTINGS OF LIRIODENDRON

Genus Liriodendron (Magnoliaceae) comprises only two species, namely Liriodendron tulipifera L. and.Liriodendron chinense (Hemsl.) Sarg. Stem cutting propagation experiment of the two species was carried out.to speed up the asexual reproduction of Liriodendron. The best factor combinations for highest rooting rate.were found out through orthogonal test. In the analysis of four factors including species, cuttings types, cutting.medium and hormone concentration, the highest rooting rate came from the combination of L. tulipifera , stem.cuttings with apical bud , peat soil and perlite (3 : 1) and ABT 380 ppm. In the analysis of three factors.including seedling age, cutting medium and hormone concentration, the highest rooting rate came from the.combination of cuttings from three years old Liriodendron, peat soil and perlite (3 : 1), and ABT 500 ppm..The key technique of cutting propagation of Liriodendron was created, which improved rooting rate of.Liriodendron in the field planting significantly and reached a maximum to 60.9%. The propagation coefficient.of two years old L. tulipifera cuttings was 5.05. Roots grew out of cuttings in the fourth week after planting,.and the number of roots increased quickly during the fourth and fifth week. In the transplanting experiment,.the survival rate of Liriodendron cuttings with roots reached up to 94.3%, and cuttings with callus had the.survival rate of 45.9%. Lateral branches obtained from cuttings which had grown roots were transplanted and.had the rooting rate of 88.6%, and the rate of cuttings with callus was 11.4%.

鹅掌楸属（木兰科）仅有两个物种，即北美鹅掌楸（Liriodendron tulipifera L.）和鹅掌楸（Liriodendron chinense (Hemsl.) Sarg.）。为加速鹅掌楸的无性繁殖，对这两个物种进行了扦插繁殖试验。通过正交试验找出了生根率最高的最佳因素组合。在对物种、插穗类型、扦插基质和激素浓度这四个因素的分析中，北美鹅掌楸带顶芽的茎插穗，以泥炭土和珍珠岩（3∶1）为基质，ABT浓度为80ppm时生根率最高。在对苗龄、扦插基质和激素浓度这三个因素的分析中，三年生鹅掌楸的插穗，以泥炭土和珍珠岩（3∶1）为基质，ABT浓度为500ppm时生根率最高。创建了鹅掌楸扦插繁殖的关键技术，显著提高了鹅掌楸大田栽植的生根率，最高达到60.9%。两年生北美鹅掌楸插穗的繁殖系数为5.05。插穗在扦插后第四周开始生根，第四周和第五周期间根的数量增长迅速。在移栽试验中，生根的鹅掌楸插穗成活率高达94.3%，有愈伤组织的插穗成活率为45.9%。将已生根插穗长出的侧枝进行移栽，生根率为88.6%，有愈伤组织的插穗生根率为11.4%。