Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Influence of Drought and High Temperature on the Physiological Response and Yield in Hot Pepper

토양 건조 스트레스와 기온상승에 의한 고추의 생리반응 및 생산량 변화

  • Lee, Sang Gyu (Vegetable Research Division, National Institute of Horticultural & Herbal Science) ;
  • Lee, Hee Ju (Vegetable Research Division, National Institute of Horticultural & Herbal Science) ;
  • Kim, Sung Kyeom (Vegetable Research Division, National Institute of Horticultural & Herbal Science) ;
  • Mun, Bo heum (Vegetable Research Division, National Institute of Horticultural & Herbal Science) ;
  • Lee, Jin Hyoung (Vegetable Research Division, National Institute of Horticultural & Herbal Science) ;
  • Lee, Hee Su (Vegetable Research Division, National Institute of Horticultural & Herbal Science) ;
  • Do, Kyung Ran (Fruit Research Division, National Institute of Horticultural and Herbal Sciences)
  • 이상규 (농촌진흥청 국립원예특작과학원 채소과) ;
  • 이희주 (농촌진흥청 국립원예특작과학원 채소과) ;
  • 김성겸 (농촌진흥청 국립원예특작과학원 채소과) ;
  • 문보흠 (농촌진흥청 국립원예특작과학원 채소과) ;
  • 이진형 (농촌진흥청 국립원예특작과학원 채소과) ;
  • 이희수 (농촌진흥청 국립원예특작과학원 채소과) ;
  • 도경란 (농촌진흥청 국립원예특작과학원 과수과)
  • Received : 2017.01.26
  • Accepted : 2018.03.15
  • Published : 2018.04.30
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Abstract

This study was conducted to determine the effects of combination of air temperature and soil water content on the growth, physiological disorder rate, and yield of hot peppers. The study was carried out in a typical plastic house (open on one side and with ventilation fans on the other side), which was maintained with gradient air temperature (maximum difference in air temperature: $6^{\circ}C$). The deficit irrigation (DI) treatment commenced 65 days after transplanting. The height of plant and fresh and dry weights of the stem increased at high air temperature (ambient + $6^{\circ}C$, extreme high temperature; EHT). Furthermore, the leaf area decreased significantly with the DI treatment. There were no significant differences in the stem diameter, number of branches, and fresh and dry weights of the leaves among all the treatments. The net photosynthesis rate of the full irrigation (FI) treatment was higher than that of the DI treatment. The photosynthesis rate at ambient air temperature was $19.7{\mu}mol\;CO_2m^{-2}{\cdot}s^{-1}$, the highest among all the treatments; however, the photosynthesis rate of the EHT treatment decreased by 60% ($12.3{\mu}mol\;CO_2m^{-2}{\cdot}s^{-1}$). Additionally, the formation of guard cells in the leaf was abnormal with the EHT treatment, and there was a decrease in translocation efficiency. The effects of air temperature treatment were more pronounced on the physiological disorder rate and yield. The physiological disorder rate of the EHT treatment was the highest under the DI treatment condition. The yield of the AFI (ambient air temperature with full irrigation) treatment was 3,771 kg/10a, the highest among all the treatments; however, the yield of the EHT treatment with DI and FI was 1,282 and 1,327 kg/10a, respectively. These results indicate that growth and physiological disorder rate improved with the EHT treatment; however, there was a decrease in yield. Furthermore, the formation of guard cells was abnormal and malfunctional.

Keywords

References

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