溫度對矮仙丹生長與開花之影響

Effects of Temperature on the Growth and Flowering in Ixora williamsii cv. Sunkist

於人工氣候室進行矮仙丹植株的不同溫度處理，結果顯示日／夜溫20/15℃最適於矮仙丹之花芽誘導，可使花序數增加。較高的溫度（30/25℃）有利於營養生長與花序發育；溫度太低（15/13℃），植株易受寒害且花序易夭折。以低溫20/15℃誘導花序產生後再移至高溫30/25℃的植株比持續在較高溫（25/20℃或以上）生長的植株產生較多的花序，但每一花序之小花數較少，且開花戎間較短。枝條成熟度愈高的植株（修剪後先在室外生長153天的植株）在低溫誘導後，其花序數均比枝條成熟度較低（修剪後直接進行溫度處理）的植株多。

The temperature treatments in phytotron of Ixora williamsii cv. Sunkist plants indicated that the most suitable temperature for flower induciton was 20/15℃. Higher temperature (30/25℃) improved vegetative growth and inflorenscenses development. If the temperature was too tow (15/13℃), the plants would occur chilling injury and the inflorenscenes might abort. Plants treated with 20/15℃ for more than three months and then moved to 30/25℃ had mach mom inflorenscences bat had shorter flowering duration and fewer Carets of each inflorenscene than those continually growning in higher temperature (25/20℃or above). Plant shoots with higher maturity (Plants grown outdoors for 153 days after pruning.) formed much more inflorenscences than those with lower maturity (Plants instantly moved to phytotron after pruning.).