蔥屬種間雜交之研究（Ⅱ）日長對韮菜抽苔與花莖品質之影響

Interspecific Hybridization in Genus Allium (Ⅱ) Effect of Photoperiod on Bolting and Flower Stalk Quality of Chinese Chive, Allium tuberosum Rottler Ex Sprengel

韮菜植株徑16小時及20小時日長處理後，須移至短日下才能抽苔。一年生與多年生植株於自然日長及經長日處理20天者，均無法抽苔，處理40天之植株花芽分化不完全，花莖較短，小花數少，抽苔率低。日長處理延長至60天時，植株抽苔率顯著增加，花芽分化亦較完全，但仍有少數之花苔於抽出後萎縮；同時以日2長20小時處理之效果優於16小時處理者。經長日90天處理者，其抽苔率急劇增加，但抽苔總日數則因處理日數之增加而有延長之結果。

Under 16 and 20 hours photoperiod treatments, plants of Chinese chive may flower only after transferring to shorter daylength condition. Plants after 20 days in both 16 and 20 hours photoperiod treatments do not flower. After 40 days of photoperiod treatment, plants showed incomplete flower bud differentiation with shorter flower stalk, fewer number of flowers per umbel and low bolting percentage. When extended treatment to 60 days in both photoperiods, plants had significantly increased in percentage of bolting as well as farther perfection in flower bud differentiation, but fewer plants showed degraded umbels after bolting. Plants under 20 hours photoperiod gave better result in bolting percentage than the 16 hours. Percentage of bolting increased rapidly for 90 days treated plants, but total number days from beginning of treatment to bolting also increased which is due to longer periods in photoperiod treatment.