한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제31권6호
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  • Pages.557-563
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  • 2017
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  • 1229-3857(pISSN)
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  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
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CO2 농도와 온도 변화가 기생 약초인 천마의 생육반응에 미치는 영향

Effects of Elevated CO2 Concentration and Increased Temperature on the Growth of Gastrodia elata Blume, Parasitic Medicinal Plant

  • 조규태 (국립공주대학교 생명과학과) ;
  • 이수인 (국립공주대학교 생명과학과) ;
  • 장래하 (국립공주대학교 생명과학과) ;
  • 박재훈 (국립공주대학교 생명과학과) ;
  • 유영한 (국립공주대학교 생명과학과)
  • 투고 : 2017.10.16
  • 심사 : 2017.11.24
  • 발행 : 2017.12.29
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초록

천마(Gastrodia elata Blume)는 난초과 다년생 기생식물로 곰팡이균과 공생하는 독특한 생활방식을 가진다. 천마의 지하근은 고혈압, 뇌졸중, 백혈병, 두통 특히 신경쇠약치료 등에 쓰이는 약용식물이다. 본 연구는 지구온난화가 천마의 생태적 반응에 미치는 영향을 알아보기 위해 보통의 야외 대기환경과 같은 대조구, 대조구보다 온도를 약 $2^{\circ}C$ 상승시킨 온도상승구, 온도와 함께 대조구보다 $CO_2$ 농도를 약 2배 증가시킨 $CO_2$+온도상승구에서 참나무 원목, 뽕나무버섯균, 종마를 함께 파종하고, 재배하여 생식기관과 지하근의 생물량을 비교 관찰하였다. 그 결과, 꽃대 수는 온도상승구> 대조구> $CO_2$+온도상승구 순으로 적었다. 꽃대 길이는 온도상승구> 대조구> $CO_2$+온도상승구 순으로 짧았다. 화서 길이는 대조구> 온도상승구> $CO_2$+온도상승구 순으로 짧았다. 생식기관의 무게는 온도상승구> 대조구> $CO_2$+온도상승구 순으로 가벼웠다. 지상부의 생물량은 온도상승구> 대조구> $CO_2$+온도상승구 순으로 낮았다. 생산된 근경의 수는 온도상승구> 대조구> $CO_2$+온도상승구 순으로 적었다. 근경의 생물량은 온도상승구> 대조구> $CO_2$+온도상승구 순으로 낮았다. 이러한 결과는 온도만 올라간 환경조건에서는 천마의 생육은 활발하여 생산량이 증가하지만, 지구온난화조건인 온도와 $CO_2$ 농도가 동시에 상승하는 조건에서는 천마의 생육이 불량하게 됨을 의미하는 것이다. 따라서, 천마의 성마와 종마 생산량을 높이기 위해서는 재배지의 적정지온 $20{\sim}25^{\circ}C$를 유지하고, 높은 $CO_2$ 농도에 노출되지 않도록 하여야 할 것이다.

Gastrodia elata (Orchidaceae) is a perennial parasitic plant that has a unique lifestyle of being in a symbiotic interaction with fungi. The underground root of Gastrodia is used for medicinal treatment to cure high blood pressure, stroke, leukemia, headaches, and especially neurasthenia. This study is intended to investigate the effect of the global warming on the ecological responses of Gastrodia. We cultivated the small tuber of Gastrodia with the oak wood lot and mulberry fungus under control (ambient $CO_2$ concentration + ambient temperature, ACAT), temperature treatment (ambient $CO_2$ concentration+elevated temperature, ACET), and $CO_2$+temperature treatment (elevated $CO_2$ concentration+elevated temperature, ECET). The elevated $CO_2$ concentration was about twice in the ambient air while the elevated temperature was about $2^{\circ}C$ higher than the control group. And then we observed the growth and production of reproductive organs and the underground root. The observation showed that the number of flower stalk was highest at ACET and lowest at ECET. The flower stalk was longest at ACET and shortest at ECET. The inflorescence was longest at ACAT and shortest at ECET. The seed capsule was heaviest at ACET and lightest at ECET. The aboveground biomass was highest at ACET and lowest at ECET. The number of rhizomes was highest at ACET and lowest at ECET. The total rhizome biomass was highest at ACET and lowest at ECET. The average rhizome biomass was highest at ACET and lowest at ECET. The results showed that the growth of Gastrodia increased because of more active growth of Gastrodia elata when only the temperature increased and decreased when both $CO_2$ concentration and temperature increased, indicating the poor growth of Gastrodia elata under the global warming condition. Therefore, the Gastrodia elata plantation should be maintained at the temperature of $20-25^{\circ}C$ and not be exposed to a high $CO_2$ concentration.

키워드

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