巴克素對春石斛蘭To My Kids 'Smile'生長及開花之影響

Effects of Paclobutrazol on Growth and Flowering of Dendrobium To My Kids 'Smile'

許嘉錦(Chia-Chin Hsu)

《臺中區農業改良場研究彙報》 137期 (2017/12) Pp. 13-24

摘要

春石斛蘭基部節位徒長問題為優質盆花生產之障礙，本研究以矮化劑巴克素施用於To My Kids 'Smile'品種，探討對其植株生育及開花之影響。結果顯示濃度1 mg．L^(-1)以上之巴克素即具有抑制株高與節間長度、減少植株平置下垂角度、增加假球莖基部之直徑、提高葉長寬比及葉片上舉之效果，但施用濃度達20 mg．L^(-1)會發生致死情形。施用3 ml之1或2 mg．L^(-1)劑量的巴克素，可增加假球莖基部第2～6節之直徑，由對照組的7.9～15.5 mm增加為9.7～25.5 mm，並使植株平置下垂角度減少36.7%以上；亦會延長植株始花時間5.8～7.2日，但花朵數、花朵大小及單花壽命並未較對照組衰減，而開花節位占全株節位比率達29%，優於對照組的24%。

關鍵字

春石斛蘭 ； 巴克素 ； 假球莖 ； 開花

並列摘要

One of the major problems of in high quality nobile-type dendrobium pot flower production is overgrowth of basal nodes. In this study, different concentration of PP333 solutions were applied to the variety To My Kid 'Smile' to investigate the effects on subsequent growth and flowering. The results showed that application of PP333 at concentration higher than 20 mg．L^(-1) would be lethal, concentration higher than 1 mg．L^(-1) could effectively reduce plant height, length of internodes, the stalk drooping degree when placed horizontally, and reduce the recurved angle of leaves. While the diameter of stems at basal nodes and the length/width ratio of leaves were increased. When spraying 3 ml of PP333 at concentrations of 1 or 2 mg．L^(-1), the diameter of basal 2^(nd)-6^(th) nodes were increased from 7.9-15.5 mm in the control to 9.7-25.5 mm in the treatments. When treated plants were placed horizontally, the stalk drooping degree was also reduced by 36.7% compared to the control. The flowering time of plants were delayed by 5.8-7.2 days, with no adverse effects on total number of flowers, size and longevity of individual flowers. The proportion of flowering nodes of total plants was increased from 24% in the control to 29% in PP333 treatments.

並列關鍵字

nobile-type dendrobium ； paclobutrazol ； pseudobulb ； flowering