Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Physiological Response of Chinese Cabbage to Salt Stress

염 스트레스에 대한 배추의 생리학적 반응

  • Kim, Ju-Sung (Oriental Bio-herb Research Institute, Kangwon National University) ;
  • Shim, Ie-Sung (Department of Environmental Horticulture, University of Seoul) ;
  • Kim, Myong-Jo (Oriental Bio-herb Research Institute, Kangwon National University)
  • 김주성 (강원대학교 한방Bio연구소) ;
  • 심이성 (서울시립대학교 환경원예학과) ;
  • 김명조 (강원대학교 한방Bio연구소)
  • Received : 2009.10.23
  • Accepted : 2009.12.19
  • Published : 2010.06.30
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Abstract

In order to understand the plant responses to salt stress (0, 50, and 100 mM NaCl), Chinese cabbage seedlings grown up to two leaf stages by hydroponic culture were used. Fresh and dry weight, chlorophyll (Chl), antioxidant materials, polyamine content, antioxidant enzyme activities, and inorganic ion level were evaluated. Fresh and dry weights of Chinese cabbage increased with the increase in salinity while the optimal growth occurred at 50 mM NaCl. The Chl a, total Chl, carotenoid content, and Chl a/b ratio increased by the 6 days after treatment with 100 mM NaCI; however, the Chl b content decreased. Glutathione increased in the root of Chinese cabbage for 6 days. Dehydroascorbate increased remarkably by day 6 caused by the salt stress in both leaf and the root. While ascorbate peroxidase increased, the activity of catalase and glutathione reductase decreased gradually in the first leaf for 6 days. The $Na^+$ content increased by 12.5-fold in the 3 days after treatment with 100 mM NaCI in the shoot, whereas the $Ca^{2+}$, $K^+$, and $Mg^{2+}$ content measured in the same treatment decreased by 43 to 57%. Spermidine content decreased as salinity increased, but spermine content increased. The growth promotion, glutathione and ascorbic acid content in Chinese cabbage were increased by low salt stress, and shortening of the cultivation period for growth increase of Chinese cabbage is expected.

염 스트레스(0, 50, 100mM NaCl)에 의한 식물 반응을 이해하기 위하여, 본 실험은 수경법으로 2엽기까지 기른 배추를 이용하였다. 신선중과 건물중, 엽록소, 항산화 물질, 폴리아민함량, 항산화 효소 활성, 그리고 이온 레벨을 조사하였다. 배추의 생체중 및 건물중은 염의 증가에 따라 증가하였으며, 50mM NaCl 처리시 최적의 성장을 보였다. Chl a, total Chl, carotenoid 함량과 Chl a/b 비는 100mM NaCI 처리후 6일째 증가하였으나, Chl b 함량은 감소하였다. 글루타치온 함량은 염처리 후 6일째 뿌리에서 증가하였으며, dehydroascorbate는 6일째 잎과 뿌리에서 현저하게 증가하였다. 염처리후 6일째 잎에서, ascorbate peroxidase 활성은 증가하였으나, catalase와 glutathione reductase 활성은 감소하였다. 지상부에 100mM NaCI 처리후 3일째, $Na^+$ 함량은 12.5배 증가하였으나, $Ca^{2+}$, $K^+$과 $Mg^{2+}$ 함량은 43-57% 감소하였다. 또한 염 스트레스에 의한 스페르미딘 감소 현상과 스페르민 증가현상을 나타내었다. 50mM NaCl 처리에 의해 배추의 생장 촉진, 글루타치온 및 비타민 C 함량 증가 현상이 나타났으며, 또한 식물의 생장 촉진에 의한 재배 기간의 단축효과도 기대된다.

Keywords

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