蔥屬種間雜交之研完（I）低溫對蔥抽苔之影響

Interspecific Hybridization in Genus Allium (I) Effect of Different Temperatures on Bolting of Japanese Bunching Onion (Allium fistulosum L.)

北蔥植株經5°C及10°C處理後，隨低溫處理日數之增加，其抽苔所需日數則較短；但低溫處理日數超過20天，因處理日數之增加，抽苔總日數則有延長之現象。5°C處理20天內之效果較10°C為佳，處理達35天時，則抽苔日數與抽苔總日數均顯著增加。10°C處理抽苔日數隨處理日數之增加而減少；處理達40天，則增加抽苔總日數。低溫處理日數增加，可使植株抽苔率提高，同時抽苔亦較整齊。

Mature plants of Japanese bunching onion were grown under 5° and 10°C in order to induce flower initiation. Results showed that the longer periods in low temperature, the shorter in number of days to bolting after treatment; while when plants grew more than 20 days in low temperature, the periods to bolting i3 increased due to longer periods of plants in low temperature. Number of days after treatment to bolting as well as total number of days from beginning of treatmen t to bolting are increased when plant grew more than 35 days in 5℃. Number of days after treatment to bolting decreased when plants grew longer periods in 10℃. Increasing number of days in low temperature also resulted in higher percentage and more uniformity in bolting.