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Effect of temperature on photosynthetic capacity and influence of harvesting time on quality of Salvia miltiorrhiza Bunge

온도에 따른 단삼의 광합성 특성 및 수확시기가 품질에 미치는 영향

  • Seo, Young-Jin (Bonghwa Medicinal Plant Research Station, GyeonBuk Agricultural Technology Administration) ;
  • Kim, Jong-Su (Bonghwa Medicinal Plant Research Station, GyeonBuk Agricultural Technology Administration) ;
  • Kim, Sun-Hwa (KMF Co., Ltd.) ;
  • Kim, Mi-Yeon (KMF Co., Ltd.) ;
  • Jeong, Yong-Jin (KMF Co., Ltd.) ;
  • Seong, Gi-Un (Department of Food Science and Technology, Kyungpook National University) ;
  • Chung, Shin-Kyo (Department of Food Science and Technology, Kyungpook National University)
  • Received : 2015.09.22
  • Accepted : 2015.11.04
  • Published : 2015.12.30

Abstract

Salvia miltiorrhiza has been used for treating heart and liver disease. In the present study, the influences of temperature on photosynthetical capacity of S. miltiorrhiza under controlled cultivation environment using growth chamber were investigated because of providing information about growth and secondary metabolite synthesis. And effect of harvesting time on growth properties and constituents such as salvianolic acid B, cryptotanshinone, tanshinone I, tanshinone IIA were evaluated. Maximum photosynthesis rate ($5.102{\mu}mol\;CO2/m2/s$) and net apparent quantum yield ($0.147{\mu}mol\;CO2/m2/s$), stomatal conductance (0.035 mmol/m2/s) and water use efficiency ($7.108{\mu}mol\;CO2/mmol\;H2O$) was highest at $20^{\circ}C$. Results of chlorophyll fluorescence showed that elevated temperature had contributed to reduce a quantum yield and electron flux in photosystem. This result demonstrated that favorable temperature condition was determined at $20^{\circ}C$. Contents of salvianolic acid B, cryptotanshinone, tanshinone I and tanshinone IIA was highest in root sample harvested at 20 March, whereas growth and yield of S. miltiorrhiza had no significant differences with harvesting time. Therefore, this study shows that temperature play an important role in photosynthetic activity and harvesting time have influence upon accumulation of constituents in root of S. miltiorrhiza.

본 연구에서는 고품질 단삼을 생산하기 위한 재배지대 구분과 수확시기에 따른 단삼의 생산성 및 성분함량에 대한 기초자료를 확보하기 위하여 온도조건별 생리반응과 수확시기별 품질을 조사하였다. 동화산물의 축적과 수분이용 효율에 영향을 미치는 광합성율, 증산율 및 엽록소 형광반응을 조사한 결과 $20^{\circ}C$에서 광합성율, 기공전도도, 수분이용 효율이 가장 좋았고 광보상점이 가장 낮아 약광조건에서도 광합성 효율이 높았으며, 최대광합성속도도와 순양자수율도 가장 높았다. 수확시기에 따른 단삼뿌리의 생육 및 수량은 큰 차이가 없었으나 salvianolic acid B, cryptotanshinone, tanshinone I, tanshinone IIA의 함량은 수확시기가 늦을수록 유의하게 증가하였으며 salvianolic acid B 함량이 가장 많았으며 수확시기별로는 11월 상순에 비해 이듬해 3월 중순 이후에 수확시료에서 약25.5배 증가하였다. Cryprotanshinone, tanshinone I, tanshinone IIA 함량 또한 2015년 3월 20일 수확한 시료에서 가장 높은 함량을 나타내었다. 따라서 단삼재배에 적합한 온도는 $20^{\circ}C$전후가 적절한 것으로 사료되며 상대적으로 고온조건인 $30^{\circ}C$에서 광합성율, 증산율, 엽록소 형광반응이 크게 저하되므로 서늘한 기후조건인 준고랭지 이상의 지역에서 단삼을 재배하는 것이 유리할 것으로 판단된다. 또한 고품질 단삼 유통을 위한 적정 수확시기는 단삼을 파종한 다음 해 3월 중순 이후에 수확을 하는 것이 합리적인 것으로 사료된다.

Keywords

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