원예과학기술지 (Horticultural Science & Technology)

  • 제33권6호
  • /
  • Pages.860-868
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  • 2015
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  • 1226-8763(pISSN)
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  • 2465-8588(eISSN)
한국원예학회 (Korean Society of Horticultural Science)
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저면공급한 규소에 의한 포인세티아의 광합성 능력 향상과 고온 스트레스 경감

Silicon Supply through Subirrigation System Alleviates High Temperature Stress in Poinsettia by Enhancing Photosynthetic Rate

  • 손문숙 (경상대학교 대학원 응용생명과학부(BK21 Plus) 원예학과) ;
  • 박유경 (경상대학교 농업생명과학연구원) ;
  • ;
  • 고충호 (경상대학교 대학원 응용생명과학부(BK21 Plus) 원예학과) ;
  • 정병룡 (경상대학교 대학원 응용생명과학부(BK21 Plus) 원예학과)
  • Son, Moon Sook (Department of Horticulture, Division of Applied Life Science (BK21 Plus), Graduate School of Gyeongsang National University) ;
  • Park, Yoo Gyeong (Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Sivanesan, Iyyakkannu (Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Ko, Chung Ho (Department of Horticulture, Division of Applied Life Science (BK21 Plus), Graduate School of Gyeongsang National University) ;
  • Jeong, Byoung Ryong (Department of Horticulture, Division of Applied Life Science (BK21 Plus), Graduate School of Gyeongsang National University)
  • 투고 : 2015.06.12
  • 심사 : 2015.08.04
  • 발행 : 2015.12.31
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초록

본 연구는 고온 스트레스에서 규소가 분화용 포인세티아(Euphorbia pulcherrima Willd. 'Ichiban')의 내고온성과 생장에 미치는 영향을 조사하였다. 포인세티아를 삽목하여 발근된 삽목묘 중 균일한 개체를 선발하여 상토가 담긴 10cm 화분에 정식하였다. 세 가지 규산염($K_2SiO_3$, $Na_2SiO_3$, $CaSiO_3$)을 0(-Si), 또는 $50(+Si)mg{\cdot}L^{-1}$ Si농도로 순환식 저면베드에서 저면관수 또는 엽면살포 방식으로 약 2개월간 재배하였다. 포인세티아의 고온 스트레스에 대한 저항성을 알아보기 위하여 규소 처리 8주째에 식물생장상의 온도를 $35^{\circ}C$로 조절하여 18일동안 재배하였다. 모든 규산염처리에서 효소적 항산화 효소인 APX의 활성이 증가하였고, 비효소적 항산화 효소인 ELP의 활성은 감소하였다. 저면으로 공급한 $K_2SiO_3$와 $Na_2SiO_3$처리에서 대조구에 비해 Fv/Fm, 광합성율, 규소함량이 증가하였다. 따라서 규산염 처리가 대조구보다 고온 스트레스에 의해 발생하는 생장의 저해가 적었으며, 특히 저면으로 $K_2SiO_3$와 $Na_2SiO_3$를 공급하였을 때 가장 효과적이었다.

The effect of Si supplied during plant cultivation on tolerance to high temperature stress in Euphorbia pulcherrima Willd. 'Ichiban' was investigated. Rooted cuttings were transplanted into 10-cm pots and a complete nutrient solution, containing 0 or $50mg{\cdot}L^{-1}$ Si as either $K_2SiO_3$, $Na_2SiO_3$, or $CaSiO_3$, was supplied through subirrigation or weekly foliar applications. After two months of cultivation, plants were placed in an environment-controlled chamber and subjected to $35{\pm}1^{\circ}C$ (high temperature) conditions for 18 days. Enhanced specific activities of enzymatic antioxidants (APX) and suppressed specific activities of non-enzymatic antioxidants (ELP) were observed in the high temperature-stressed plants with Si application. The Fv/Fm (maximum quantum yield of photosystem II), photosynthetic rate, and Si contents in the shoot increased in the treatments of $K_2SiO_3$ and $Na_2SiO_3$ supplied through subirrigation. The Si-treated plants had more tolerance of high temperature stress than the control plants. Of the Si sources and application methods tested, $K_2SiO_3$ and $Na_2SiO_3$ supplied through subirrigation were found to be the most effective in enhancing tolerance to high temperature stress.

키워드

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