Researches of Cutting Propagation of Hibiscus (Hibiscus rosa-sinensis)

• Main Authors: Yun-Hui Lai, 賴允慧
• Other Authors: Yu-Sen Chang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/88064425181193745282

碩士 === 國立臺灣大學 === 園藝學研究所 === 92 === The hibiscus (Hibiscus rosa-sinensis L.) belongs to the family of Malvaceae, is a woody perennial plant, and flowering is by self-induced. Cultivars with variety of flower color and type of hibiscus are over 10,000. Cutting propagation is the most and major method and also in Taiwan. But there are some problems in propagation of special cultivars and selection of right cutting, which are influenced with rooted cutting growth. Therefore, this present study discussed the factors influenced cutting rooting, and it is expected to resolve these problems in commercial production of hibiscus. The response of cuttings in root formation was determined in 10 cultivars, and different cultivars had different rooting abilities. Hibiscus rosa-sinensis ‘Albo-Strip’ gave the fastest rooting rate and greatest number of roots per cutting, and followed by ‘Moon Glow’, ‘Maple’, ‘Ruby-Plenus’, ‘Birma’, ‘Kermesinoplenus’, ‘Norma’ and ‘Albo-Plenus’, while ‘Flavo-Plenus’ and ‘Fluffy Ruffle’gave the lowest. Determined shoot growth rate in 7 cultivars by inter-node length and leaf number.It showed ‘Albo-Strip’ is the greatest, then followed by ‘Ruby-Plenus’, ‘Birma’, ‘Kermesinoplens’, ‘Norma’, ‘Flavo-Plenus’ and ‘Fluffy Ruffle’ is the fewest. Single-node 2-4 from ‘Birma’ gave the fastest rooting rate, rooting and survival percentage. The cuttings taken from upper shoot also had better rooting percentage and young rooting percentage than the bottom part of shoot. Short cuttings had better rooting abilities when untreated with rooting promoters, while long cuttings treated with rooting promoters had much better abilities. High fresh weight cuttings had much more stem dry weight, and also had longer root length and more root dry weight. The effect of cutting season on root formation and development was better in summer (July to September), but more root number in fall (October to November).At environmental temperature 25/20℃, ‘Albo-Strip’ cuttings had the fastest rooting rate, the greatest number of root, and the highest rooting percentage. And then at 30/25℃, root development(length and diameter) of cuttings were much better. To common hibiscus the higher temperature is better to rooting, but cutting survival percentage would be down when over 30℃. There was the effect on rooting abilities of cuttings with bottom heat in winter. At 25℃ ‘Albo-Strip’ gave the greatest rooting abilities, but to common hibiscus and ‘Birma’, the higher the better. Rough river sand and coconut fiber were the good rooting media to ‘Albo-Strip’ in automatic misting system. But in this case, the popular media—peat mixed perlite is the worst to rooting. Results indicated that the greatest root number and the longest root length were induced by IBA quick-dip and powder-adhering in 2500mg/L , and NAA powder-adhering in 800mg/L. NAA 1000mg/L quick-dip gave the greatest root number among all treatments, but the root diameter was narrowest. Root fresh weight increased treated with combined of quick-dip 2000 mg/L IBA and 250mg/L NAA. ‘Root inducer’ is office-made product, and combined used with IBA 2000 mg/Kg powder gave more effect than single used of two. Bottom girdling of ‘Flavo-Plenus’ cuttings gave the fastest rooting rate and highest rooting ratio than untreated.