割接應用在聖誕紅盆花生產之研究

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''，分別可以增加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''品種之後會對苞葉顏色產生改變，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。 割接在聖誕紅生產上具有上述的優點，不過本研究中也發現了缺點，那就是割接後顯然使分枝性增加，但是卻造成分枝角度過大、株形過於鬆散的情況。所以應用割接在聖誕紅盆花商業生產之前，都必須先經過試驗，如此才能真正的得到由割接所帶來的益處。

Two selected seedling 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''. This 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''. Advantages of cleft-grafting in pot poinsettia production were described above, however, the deficits of cleft-grafting, exceeded branching angles and loose plant forms, were also founded in these studies. Therefore, to obtain the real advantages of cleft-grafting, preliminary test should be made before applying this method on pot poinsettia production.