KOREASCHOLAR

국화는 개화를 위해서는 30일의 지속적인 단일 처리가 요구되는 원예작물인데 본 연구에서는 국화의 화형별 홑꽃 타입의 ‘Limelight’, ‘Sunlight’, ‘Candle Light’, ‘Firebrand’, ‘Twilight’와 겹꽃 타입의 ‘Spirit’, ‘Sunburst Spirit’, ‘Mandalay’, ‘Illini Harvest’가 단일 (SD)−장일 (LD)−단일 (SD)의 일장 처리가 생장 및 개화조절 반응에 미치는 효과를 알아보고자 수행되었다. 30일간의 단일 처리와 5일 또는 10일 동안의 장일처리 후 5일 또는 10일 동안의 단일조건을 각각 처리하였다. 품종별 차이는 없었으나 5 SD−10 LD−25 SD 처리는 개화를 지연 시키고 설상화 수가 증가되었다. 특히 ‘Firebrand’와 ‘Candlelight’ 품종의 설상화 수는 각각 40개와 60.8개로 대조구에 비해 현저히 증가되었다. 또한 SD−LD−SD 처리는 개화를 6일에서 7일정도 지연시키는 것 외에는 큰 효과를 나타나지 않았다. 그러나 ‘Illini Harvest’와 ‘Limelight’의 설상화 수는 어떤 SD−LD−SD 처리에 의해서도 증가되지 않았다. 따라서 추후 새로운 품종별 일장처리에 따른 추가적인 연구 분석이 뒤따라야 할 것으로 판단되며 본 연구 결과는 국화의 신품종 육성을 위한 자료에 유용함을 알 수 있었다.

In Chrysanthemum × morifolium, 30 days of continuous short days (SD) are required for flowering. The effects of alternating short day (SD) − long day (LD) − SD treatments was tested in 5 daisy-like single cultivars, ‘Limelight’, ‘Sunlight’, ‘Candle Light’, ‘Firebrand’, and ‘Twilight’. Thee other decorative type cultivars, ‘Spirit’, ‘SunburstSpriit’, ‘Mandalay’, and ‘Illini Harvest’ was also included. Short day treatment was given for 30 days (control: 30SD) and 5 or 10 LD were interposed following 5 or 10 SD. Different responses were noticed when data from all cultivars were combined, showing that flowering was delayed and the number of ray florets were increased by 5 SD−10 LD−25 SD. The number of ray florets, 40 florets in ‘Firebrand’ and 60.8 florets in ‘Candlelight’ was increased significantly by 5 SD−10 LD−25 SD as compared to the control. There were no adverse effects by SD−LD−SD treatment, except for the delay in flowering time from 6 to 7 days. The number of ray florets in ‘Illini Harvest’ and ‘Limelight’ were, however, not increased by any SD−LD−SD treatments. Cultivar dependent responses should further be investigated in other newly available cultivars, and this information could be used to breed new cultivars.

• Jeung Keun Suh(Department of Environmental Horticulture, School of Bio-Resources Science, Dankook University) | 서정근 Corresponding author
• Ji Hee Kim(Department of Environmental Horticulture, School of Bio-Resources Science, Dankook University) | 김지희
• Ae Kyung Lee(Department of Environmental Horticulture, School of Bio-Resources Science, Dankook University) | 이애경