백색 반겹꽃 화형의 화단용 국화 ‘브라이트볼’ 육성과 개화 특성 평가

초록

This study was conducted to evaluate the breeding history and major horticultural characteristics of ‘Bright Ball’, a new semi-globular garden chrysanthemum cultivar featuring white, semi-double flowers developed by the Flower Research Institute of Chungcheongnam-do Agricultural Research and Extension Services, in comparison with a control cultivar. Furthermore, it aimed to establish optimal cultivation conditions for high-quality production by investigating the flowering and growth responses according to the duration of short-day (SD) treatment during greenhouse pot cultivation. ‘Bright Ball’ was selected from superior seedling lines derived from open-pollinated seeds of the maternal parent and registered following regional adaptation trials. As an early-flowering cultivar that blooms in late September under natural photoperiod conditions, it flowers earlier than the control cultivar ‘White Miri’, making it advantageous for early autumn shipping. Without pinching, it continuously produces new shoots from the base to induce autonomous branching, forms a stable semi-globular plant architecture without stem splitting due to high stem strength, and exhibits excellent overwintering ability under field conditions in Korea, making it highly suitable for garden landscaping. Morphologically, it produces white ray florets and features smaller plant height but larger flower diameter and a higher petal count than the control cultivar, providing superior volume and ornamental value for individual flowers. In addition, evaluation of short-day treatment durations for controlling shipping time under greenhouse pot cultivation revealed that longer SD treatments tended to accelerate flowering. However, excessive and continuous SD treatment beyond a certain period led to a reduction in vegetative growth, thereby deteriorating overall growth traits such as plant height, plant width, flower count, and flower diameter. Conversely, the 8-week SD treatment condition effectively promoted flowering while maintaining optimal plant height, flower count per plant, flower diameter, and pedicel length, confirming it as the optimal condition satisfying both shipping schedule control and commercial quality retention. Consequently, ‘Bright Ball’ is highly valuable for open-field garden landscape composition based on its outstanding overwintering ability and stable natural semi-globular plant architecture, and it is expected to contribute to strengthening market competitiveness and increasing farm income through greenhouse cultivation with precise flowering control.

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