염농도에 따른 갯질경(Limonium tetragonum) 종자의 발아와 식물체의 생장 및 항산화 활성
Seed Germination, Plant Growth and Antioxidant Capacity of Limonium tetragonum under Different Salt Concentrations
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본 연구는 염생식물인 갯질경의 염농도에 따른 종자 발아, 식물체의 생장 및 식물체 내 항산화 활성, 총 폴리페놀 함량, 총플라보노이드 함량을 조사하고자 수행하였다. 갯질경 종자는20℃에서 발아율이 86%로 가장 높았고, 이어서 25℃, 30℃, 1 5℃ 순서로 발아율이 높았다. 20℃에서 갯질경 종자의 발아율은 염농도 0%와 0.5%에서 80% 이상으로 높았지만, 염농도1.0% 이상에서는 발아율이 매우 낮았다. 갯질경 식물체의 생장은 염농도 0%에서 1.0%까지는 차이가 없었고, 염농도 2%에서는 염농도 0%와 비교하여 60% 수준의 건물중량을 보였다. 식물체 내 무기성분 함량은 염농도가 높을수록 Na+ 함량은 증가하였고, K+, Ca++, Mg++ 함량은 감소하였다. 항산화 활성 및 총 폴리페놀과 총 플라보노이드 함량은 염농도 0%와 0.5%에서 비슷하였고, 염농도 2%에서 가장 높은 경향을 보였다. 따라서 염농도0.5% 이하의 토양에서 갯질경을 재배하면 안정적인 발아와 생장이 가능하고, 항산화 활성 및 총 폴리페놀과 총 플라보노이드함량의 변화가 적기 때문에 균일한 품질의 항산화 관련 재료를얻는데 유용할 것으로 판단된다.
Abstract
Limonium tetragonum is a halophyte grown naturally in the coastal region in South Korea. This study was conducted to investigate the effects of salt concentrations on seed germination, seedling growth, and antioxidant capacity of L. tetragonum. Seeds were collected from naturally grown plants of L. tetragonum and those at full maturity were used in this experiment. All experiments were performed at 0%, 0.5%, 1.0%, or 2.0% of salt concentrations. Seed germination rate was highest as 86% at 20℃ and followed as higher in order of 25℃, 30℃ and 15℃. The germination rate was about 80% at 0% or 0.5% of salt concentration, but it was very low at the salt concentrations higher than 1%. Growth of L. tetragonum seedlings showed no difference in Hoagland solution containing NaCl in the range of 0% to 1.0% and seedlings survived at 2.0% of NaCl concentration. As the salt concentration increased, the content of Na+ in the shoot increased, but that of K+, Ca++, or Mg++ decreased. The antioxidant activity and the content of total polyphenol and total flavonoid in the shoot were similar at 0% and 0.5% of NaCl and were highest at 2.0% of NaCl concentration. In conclusion, performance of seed germination and plant growth of L. tetragonum was highest at 0% and 0.5% of NaCl concentration, and showed no difference in antioxidant activity, total polyphenol contents, and total flavonoid contents at the same salt concentrations.
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