Korean Journal of Medicinal Crop Science (한국약용작물학회지)

The Korean Society of Medicinal Crop Science (한국약용작물학회)
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Effects of Drought Stress on Photosynthetic Capacity and Photosystem II Activity in Oplopanax elatus

수분스트레스가 땃두릅나무의 광합성 능력 및 광계 II의 활성에 미치는 영향

  • Lee, Kyeong Cheol (Division of Plant Management, National Institute of Ecology) ;
  • Kim, Sun Hee (Department of Forest Conservation, Korea Forest Research Institute) ;
  • Park, Wan Geun (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Kim, Young Seol (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
  • 이경철 (국립생태원 식물관리처) ;
  • 김선희 (국립산림과학원 산림생태연구과) ;
  • 박완근 (강원대학교 산림자원학과) ;
  • 김영설 (강원대학교 산림자원학과)
  • Received : 2013.12.04
  • Accepted : 2014.01.20
  • Published : 2014.02.28
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Abstract

This study was performed to investigate the physiological responses of Oplopanax elatus by water condition. Drought stress was induced by withholding water for 26 days. The results show that $P_{N\;max}$, SPAD, gs, E and Ci were significantly decreased with decreasing of soil moisture contents. However, AQY and WUE were decreased slightly only at 26 day. This implies that photosynthetic rate is reduced due to an inability to regulate water and $CO_2$ exchange through the stomatal. According to JIP analysis, ${\Phi}_{PO}$, ${\Psi}_O$, ${\Phi}_{EO}$ and $PI_{ABS}$ were dramatically decreased at 21 day and 26 day, which reflects the relative reduction state of the photosystem II. On the other hand, the relative activities per reaction center such as ABS/RC, TRo/RC were significantly increased at 26 day. Particularly, Dio/RC and DIo/CS increased substantially under drought stress, indicating that excessive energy was consumed by heat dissipation. These results of chlorophyll a fluorescence show that the sensitivity changes photosystem II activity. Thus, according to the results, O. elatus was exhibited a strong reduction of photosynthetic activity to approximately 10% soil moisture contents, and JIP parameters could be useful indicator to monitor the physiological states of O. elatus under drought stress.

Keywords

References

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