The Study of Seedlings for Tree Poinsettia Production

• Main Authors: Yu-Che Yeh, 葉育哲
• Other Authors: Tsai-Yih Wang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/77869052329716699233

碩士 === 國立中興大學 === 園藝學系 === 91 === Poinsettia seedlings have some advantages different than general commercial cultivars. This study took these advantages and cooperated with pinching technique, plant growth regulator or grafting to investigate the applicable production of tree poinsettia from seedling. Further more, we would like to improve the seed emergence percentage by using different seed size and sowing in temperature-controlled environment. The germination percentage increased and uniform seedlings established when sowing environment of sorted poinsettia seed was less than 28℃ or keep away from summer. It increases to 6 lateral shoots used leaf removal treatment and at least need 3 times pinching to produce tree poinsettias from 20-25 cm seedlings. BA 0.1 % + GA3 0.05 % has no improvement of poinsettia architecture, but the tops 10 axillaries will be sprouted and the growth of lateral shoots could be induced to 5.0 cm. That will be benefit for induce growth of laterals and increase cuttings of restricted branching poinsettia. The labor cost of basal shoots or leaf removal could be reduced if used seedling grafting for tree poinsettia production. Grafting the 5-10 cm scion on 30 cm of seedling could produce the perfect architecture of tree poinsettia Grafting the self-branching cultivars on the seedling is the best method for tree poinsettia production. This method not only could reduce the labor cost of basal shoots removal but also have the fineness laterals and crown architecture for tree poinsettia.