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Effect of Low Night-time Temperature during Seedling Stage on Growth of Spring Chinese Cabbage  

Lee, Jun-Gu (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Lee, Ji-Weon (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Park, Suh-Yung (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Jang, Yoon-Ah (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Oh, Sang-Seok (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Seo, Tae-Cheol (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Yoon, Hyeong-Kwon (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Um, Young-Cheol (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
Publication Information
Journal of Bio-Environment Control / v.20, no.4, 2011 , pp. 326-332 More about this Journal
Abstract
The growth and bolting characteristics of spring Chinese cabbage cultivars at two night-time temperature treatments such as $5^{\circ}C$ and $10^{\circ}C$ during seedling stage were investigated to establish a safe environmental management strategy for raising seedlings. The low night-time temperature treatments were applied at 5, 10, and 15 days after sawing and the treatment durations were 5, 10, and 15 days in each of treatment beginning. The growth of seedlings in all the tested cultivars were linearly reduced as the treatment duration was extended and no symptoms of bolting were found. The reduction rate in seedling growth of 'Chunkwang' reached to 59.3% at most by 15 days of $5^{\circ}C$ treatment when it be compared to that of control. However, no symptoms of bolting were shown in the treatments of two night-time temperatures until the harvest at 90 days after sawing, indicating that the vernalization effect by low night-time temperature could be mitigated by subsequent day-time optimal temperature management. This study showed that the major spring Chinese cabbage cultivars require more ultimate level of low night-time temperature treatment for the vernalization than this study. It is also supposed that the optimal day-time temperature management can reduce or delay the rate of bolting, even if the seedlings were exposed to short-term low temperature below $5^{\circ}C$ during night-time.
Keywords
Chinese cabbage; low night-time temperature; bolting; vernalization;
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