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

육묘기 야간 저온이 봄배추의 생육에 미치는 영향

  • 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)
  • 이준구 (국립원예특작과학원 채소과) ;
  • 이지원 (국립원예특작과학원 채소과) ;
  • 박수형 (국립원예특작과학원 채소과) ;
  • 장윤아 (국립원예특작과학원 채소과) ;
  • 오상석 (국립원예특작과학원 채소과) ;
  • 서태철 (국립원예특작과학원 채소과) ;
  • 윤형권 (국립원예특작과학원 채소과) ;
  • 엄영철 (국립원예특작과학원 채소과)
  • Received : 2011.10.15
  • Accepted : 2011.12.28
  • Published : 2011.12.31

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.

본 연구는 주요 봄배추 품종에 대하여 야간 저온처리가 생육 및 추대에 미치는 영향을 평가하여 봄배추 육묘 시 안정 환경관리의 기준을 설정하고자 수행하였다. 시험에는 '춘광' 등 주요 봄배추 7품종을 이용하였으며 생육상을 이용하여 야간에 $5^{\circ}C$$10^{\circ}C$의 저온처리를 실시하였다. 처리시점은 파종 후 5, 10 및 15일째부터, 처리기간은 각 처리시작 시점부터 5, 10 및 15일간으로 각각 조합 처리한 후 포장에서의 생육 및 추대 여부를 조사하였다. 시험에 사용한 모든 품종에 있어서 최대 $5^{\circ}C$에서 15일간의 야간 저온처리에 의하여 유묘생육은 크게 저하하였으나 재배기간 동안 추대는 일어나지 않았으며 정식 90일 후 정상적인 수확이 가능하였다. '춘광' 품종에 대한 육묘기 야간 저온처리 개시 시점과 처리기간의 복합 처리 결과, 낮은 온도조건으로 어린식물체의 상태에서 처리기간이 길어짐에 따라 묘 생체중이 대조구에 비해 최대 59.3%까지 크게 감소되었다. 반면 저온처리 후 생육이 극도로 억제된 묘는 정식 후 생육이 다시 회복되어 수확시 생체중은 대조구 대비 72.3~110%의 범위를 나타내어 모든 처리구에서 정상적인 수확이 가능하였다. 또한 $5^{\circ}C$ 또는 $10^{\circ}C$에서 최대 15일간의 육묘기 야간저온 처리에 의한 추대 현상은 관찰되지 않았다. 본 연구를 통해 봄배추 주요 품종에 대한 육묘기 야간 저온이 생육에 미치는 영향은 제한적으로 나타났다. 육묘기간 동안 단기간 $5^{\circ}C$ 이하의 저온에 노출된 경우에도 주간의 적정한 온도관리와 포장에서의 기후조건에 따라 추대를 지연시키거나 방지시킬 수 있을 것으로 생각된다.

Keywords

References

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