The Study of Cleft Grafting Application in Pot Poinsettia Production

Abstract

本研究以兩個實生選育品種‘8302’和‘8305’以及兩個商業栽培品種‘Peter Star’和‘Supjibi’作為試驗材料，探討割接應用在聖誕紅盆花生產對分枝數及植株高度的影響。實生選育品種‘8302’及‘8305’割接在商業品種之後，在植株高度方面，‘8302’和‘8305’割接在‘Peter Star’品種，分別可以降低植株高度達49%及26%。在分枝數方面，‘8302’和‘8305’割接在‘Peter Star’，分例可以增加1.9倍及3.1倍。商業栽培品種‘Peter Star’和‘Supjibi’應用割接之後，就株高及分枝數方面對‘Peter Star’並沒有顯著的影響，但是‘Peter Star’割接在‘8305’品種之後會對苞葉產生改變，顏色會變的較為鮮紅，而這種顏色的改變和分枝性相同，可以隨著營養繁殖保持下去。‘Supjibi’割接在‘Peter Star’之後，分枝數可由8個分枝增加到8.9個分枝，並且也有促進發根的效果。

Two selected seeding clones '8302' and '8305' poinsettia, and two commercial cultivars 'Peter Star' and 'Supjibi' were used in this study to investigate if cleft-grafting could be useful for pot poinsettia production in order to control branching and height. After cleft-grafting poinsettia '8302' and '8305' on 'Peter Star', the plant height was reduced by 49％ and by 26％ and the branching number was increased 1.9 times and 3.1 times, respectively. Plant height and branching number did not have significant difference while 'Peter Star' and 'Supjibi' were cleft-grafting on 'Peter Star'. However, bract color becomes more reddish than ever after 'Peter Star'was cleft-grafting on '8305'. The characteristic will be maintained via vegetative propagation, and so as the characteristic of branching number. The average branching number was increased from 8 to 8.9 and rooting was promoted as 'Supjibi' was cleft-grafting on 'Peter Star'.