The Effects on Yield, Fruit Characteristics and Growth caused by Low Temperature Treatment of Cucumber (Cucumis sativus L.) Seedling

오이묘의 저온처리가 생육, 과실특성 및 수량에 미치는 영향

This study was conducted to investigate the influence of chilling temperature and duration at different seeding stages on yield, fruit characteristics and growth of cucumber in a greenhouse. When 20-day-old cucumber were exposed to 0 and 3℃ for 10 hours, 25 and 30% reduction in the main stem elongation rate and 34 and 37% reduction in total leaf area per plant were observed. The reduction in stem elongation and total leaf area was apparently associated with the increases in chilling duration. Exposure of seedlings to 6℃ failed to causes any significant differences in growth as compared to the unchilled plants. Repeated exposure of seedlings to 3℃ chilling for 10 hours per day increased the chilling injury significantly. The seedlings exposed to low temperature for 3 consecutive days exhibited severe injury as compared to the seedlings exposed to chilling treatment only once or twice. Fruit elongation rate was inhibited by approximately 10%, such as 0.59~2.26cm/day, with chilling of 15 hours at 0℃ as compare to 0.61~2.60cm/day in the non-chilled plants. Chilling treatment at 0~3℃ for 10 hours reduced the percentage of marketable fruits by 25~26%. while it increased the percentage of severely bent fruits significantly. Total fruits yield was reduced by 15~25% in cucumber plants when the chilling treatment was given to 20-day-old seedlings and by 22~37% in 30-day-old seedlings. This shows that, Larger seedlings were more sensitive to chilling. Total yield was also influenced by the duration of chilling. Definitely, at 0℃, 5-hour chilling treatment caused 18% of reduction, 10-hour caused 30%, and 15-hour caused 36%, respectively.

본 연구는 오이묘의 생육단계에 따라 저온처리 온도와 지속기간이 오이 생육, 과실특성 및 수량에 미치는 영향을 구명하고자 실시하였으며 주요 결과는 다음과 같다. 1. 10시간 저온처리(3℃ 및 0℃)하여 20일간 수경재배한 오이의 초장은 무처리 (20℃)에 비해 각각 25 및 30%, 엽면적은 34 및 37% 감소되었으나, 6℃ 처리에서는 무처리와 큰 차이가 없었다. 저온처리 기간에 따른 생육저해는 처리 시간에 비례하여 증가하는 경향이었다. 2. 저온처리(3℃, 10시간)횟수를 1, 2 및 3회로 증가할수록 초장, 엽면적 및 건물중은 무처리에 비해 크게 감소하였으나 1회와 2회 처리간에는 유의차가 없었고, 3회 연속처리에서만 현저히 감소하였다. 3. 오이과실의 개화 후 일수에 따른 신장속도는 무처리는 0.61~2.60cm/일 인데 비하여 0℃, 15시간의 저온 처리는 0.59~2.26cm/일로 약 10% 감소되었다. 4. 저온처리(0~3℃,10시간)는 오이의 상품과율을 25~26% 감소시켰고, 하품과율은 현저히 증가시켰다. 5. 오이 수량은 6℃, 10시간 처리에서는 무처리와 차이가 없었으나 3℃와 0℃처리는 무처리에 비해 20일묘에서 15~25%, 30일묘에서 22~37% 감수되었다. 0℃에서 5시간, 10시간 및 15시간 저온처리하였을 때에는, 무처리에 비해 각각 18%, 30%, 및 36% 감수되었다.