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NTIS 바로가기원예과학기술지 = Korean journal of horticultural science & technology, v.28 no.3, 2010년, pp.343 - 352
김주성 (강원대학교 한방Bio연구소) , 심이성 (서울시립대학교 환경원예학과) , 김명조 (강원대학교 한방Bio연구소)
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 i...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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염 스트레스는 어떤 문제를 유발하는가? | 일반적으로 토양 중에 Na+과 Cl-가 고농도로 존재하면 식물은 염 스트레스를 받는다. 염 스트레스는 이온의 독성(주로 Na+와 Cl-), 수분포텐셜의 저하, 이온의 흡수 및 수송의억제에 의한 영양불균형을 일으키며(Munns와 Termaat, 1986), 식물의 생산성 억제와 초기생장 감소를 가져온다. 따라서, 생장억제는 토양수분의 삼투압포텐셜 또는 가용성 염의 전체 농도에 직접 관계한다. | |
식물의 체내 글루타치온 함량을 바꾸는 스트레스에는 어떤 것이 있는가? | 스트레스나 화학물질이 식물의 체내 글루타치온 함량을 증가시키기도 한다(Kopriva와 Rennenberg, 2004). 예로, 중금속, 고농도 포도당 및 열에 의한 스트레스들이 세포 내 글루타치온 농도를 바꾸는 것으로 알려져 있다. 글루타치온의 세포 내포량은, 이용과 합성 동안의 밸런스 기능으로 정해진다. | |
식물은 어떤 물질에 의하여 활성 산소종으로부터 방어되고 있는가? | 염 스트레스는 생장, 광합성, 단백질 합성, 에너지나 지방질대사 등 모든 주요한 과정에 영향을 주어 생장억제는 모든 식물에서 일어나지만, 치사농도의염에 대한 생장감소율과 내성 레벨은 여러 식물 종간에 따라 크게 다르다(Parida와 Das, 2005). 또한, 강광, 건조, 염등의 환경 스트레스는 스트레스의 지속시간, 강도 및 식물의 연령 등에 따라 활성 산소를 증가시키지만, 식물은 활성 산소종을 제거하는 superoxide dismutases(SOD), peroxidase(POX), catalase(CAT) 및 glutathione reductase(GR) 등의 항산화 효소의 활성 유도에 의해 활성산소종으로부터 방어되고 있다(Bowler 등, 1992). |
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