Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Promotion of Plant Growth by Submergence and the Action Network of Hormones

침수에 의한 식물의 생장 촉진과 호르몬들의 작용 네트워크

  • Cho Young Jun (Department of Molecular Biology & Institute of Nanosensor and Biotechnology, Dankook University) ;
  • Lee Young Na (Department of Molecular Biology & Institute of Nanosensor and Biotechnology, Dankook University) ;
  • Park Woong June (Department of Molecular Biology & Institute of Nanosensor and Biotechnology, Dankook University)
  • 조영준 (단국대학교 분자생물학과/나노센서 바이오텍 연구소) ;
  • 이영나 (단국대학교 분자생물학과/나노센서 바이오텍 연구소) ;
  • 박웅준 (단국대학교 분자생물학과/나노센서 바이오텍 연구소)
  • Published : 2005.02.01
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Abstract

Plants living riverside show diverse resistance responses to submergence. The promoted petiole elongation of semi-aquaitc plants, e.g., such as Ranunculus sceleratus and Rumex palustris, is one of the adaptive responses mediated by the plant hormone ethylene. The gaseous hormone is trapped in submerged plant tissues and enhances the petiole growth by increasing sensitivity of the tissues to some plant hormones including auxin. Due to the stimulated growth of petioles, the leaves finally reach the water surface and can respirate again. At the water surface, the accumulated ethylene diffuses out from the tissues to the air. As a result, the increased hormone sensitivity decreases again, and thus the growth rate reduces to the basal level as before. The increased auxin sensitivities by ethylene observed in Ranunculus sceleratus, revealed by the changes in the auxin dose-response curves, indicate the increase of affinities of the receptors to auxin. However, the molecular mechanism of the affinity regulation remains still largely unknown, because the identity of the auxin receptor is still unclear.

하천변에 사는 식물들은 침수 저항성을 갖추고 있는데 그중 Ranunculus속이나 Rumex속에 속하는 일부 반수생 식물들에서 볼 수 있는 것처럼, 엽병이 급격한 생장을 일으켜 잎이 수표면에 이르게 함으로써 호흡할 수 있는 조건을 확보하는 현상은 식물체내에 축적된 에틸렌에 의하여 매개되는 현상이다. 침수 조건에서는 식물 조직 내에 에틸렌이 축적되며, 축적된 에틸렌은 옥신 등 다른 식물호르몬에 대한 조직의 감수성을 증가시켜 생장을 촉진한다. 증가된 생장으로 잎이 수표면에 이르게 되면 다시 공기를 접촉하여 호흡할 수 있게 되고, 식물체내에 축적되었던 에틸렌은 대기 중으로 확산하여 나가게 되므로 체내 에틸렌 농도가 감소하여 생장률이 침수 이전 수준으로 되돌아간다. 에틸렌에 의한 옥신의 감수성 증가는 선량 반응 곡선에 비추어 수용체의 친화도 증가가 수반되는 것으로 생각되는데, 아직 옥신 수용체가 밝혀지지 않아 분자생물학적 기작은 연구되어야 할 과제로 남아있다. 최근 옥신 수용체 발견의 가능성이 높아지고 있으며, 따라서 에틸렌에 의한 옥신 수용체의 옥신에 대한 감수성 조절기작을 탐구할 수 있는 길이 열릴 것으로 기대된다.

Keywords

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