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Effect of Jasmonic Acid and NaCl on the Growth of Spearmint(Mentha spicata L.)

Jasmonic Acid 및 NaCl 처리가 스피아민트의 생육에 미치는 영향

  • Choi, Young (Dept. of Horticulture, Biotechnology & Landscape Architecture, Seoul Women's Univ.) ;
  • Chiang, Maehee (Dept. of Horticulture, Biotechnology & Landscape Architecture, Seoul Women's Univ.)
  • 최영 (서울여자대학교 원예생명조경학과) ;
  • 장매희 (서울여자대학교 원예생명조경학과)
  • Received : 2017.01.18
  • Accepted : 2017.04.28
  • Published : 2017.04.30

Abstract

This study investigated the effects of NaCl and jasmonic acid (JA) on the growth and physiological responses of spearmint (Mentha spicata L.). Spearmint was hydroponically grown for 3 weeks in modified Hoagland solution containing 0 (untreated control), JA ($20{\mu}M$ JA pretreatment), NaCl (50 mM NaCl treatment) and JA + NaCl ($20{\mu}M$ JA pretreatment + 50 mM NaCl treatment). Growth characteristics, chlorophyll, vitamin C, proline contents, DPPH scavenging activity and inorganic ion contents were evaluated. As a results, there were significant decreases in the plant height, leaf length, leaf width, and fresh weight of plants, treated with NaCl compared with control. On the other hand, the dry matters of shoot and root treated with JA + NaCl combination were better than control or NaCl treatment. Chlorophyll a and b contents in JA treatment was the highest. Vitamin C, antioxidant activity, and proline content in shoot were increased in NaCl treatment which showed low level of growth rate. The K/Na ratio, which is known to indirectly reflect the balance of ion uptake, was higher in a single treatment of JA than the control group, while lower in salt treatment (NaCl and JA + NaCl) because of high $Na^+$ absorption. In conclusion, these results showed that moderate stress treatment such as low level salt treatment and plant growth regulator jasmonic acid (JA) application would be potential strategies to improve the quality of spearmint by inducing the accumulation of secondary metabolites containing high antioxidant activity and essential oil.

본 연구는 NaCl 및 jasmonic acid(JA) 처리 시 스피아민트(Mentha spicata)의 생육 및 생리적 반응 변화를 조사하고자 실시하였다. 대조구, JA($20{\mu}M$ JA 전처리), JA+NaCl($20{\mu}M$ JA 전처리+ 50mM NaCl), NaCl(50mM NaCl) 처리 등 4처리구로 구분하여 0.5배 Hoagland 용액에서 3주간 수경 재배한 후 생장반응과 엽록소, 비타민 C, 프롤린, 무기물, DPPH 라디칼 소거 항산화 활성 등을 측정하였다. 스피아민트의 초장, 엽장, 엽폭 및 생체중은 대조구에 비해 모든 처리구에서 감소하였고, 특히 NaCl 처리구에서 현저히 감소하였다. 반면에 건물중은 JA+NaCl 혼용처리구를 비롯하여 모든 처리구에서 증가하였다. 엽록소 a와 b 함량은 JA 처리구가 가장 높았으나 비타민 C와 항산화 활성 및 지상부의 프롤린 함량은 염 스트레스로 생육이 가장 낮았던 NaCl 처리구에서 가장 높게 나타났다. 이온 흡수의 균형 정도를 알 수 있는 K/Na 비율은 JA 단독 처리 시 증가하였고, NaCl처리 및 JA+NaCl 혼용 처리구에서는 $Na^+$ 흡수 증가로 인하여 K/Na 비율이 낮아졌다. 이러한 결과는 낮은 염 스트레스나 JA처리 같은 적절한 스트레스 처리가 항산화 활성과 정유를 포함하는 이차대사물질의 축적을 유도함으로써 스피아민트의 품질을 향상시킬 잠재적인 가능성을 보여준다.

Keywords

References

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