Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Enhancement of Photosynthetic Characteristics and Antioxidant Enzyme Activities on Chili Pepper Plants by Salicylic Acid Foliar Application under High Temperature and Drought Stress Conditions

고온 및 건조 스트레스 조건 하에서 살리실산 경엽처리에 의한 고추의 광합성 특성 및 항산화효소 활성 증대

  • Lee, Jinhyoung (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Lee, Heeju (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Wi, Seunghwan (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Lee, Hyejin (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Choi, Haksoon (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Nam, Chunwoo (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Jang, Seonghoe (World Vegetable Center Korea Office (WKO))
  • 이진형 (농촌진흥청 국립원예특작과학원) ;
  • 이희주 (농촌진흥청 국립원예특작과학원) ;
  • 위승환 (농촌진흥청 국립원예특작과학원) ;
  • 이혜진 (농촌진흥청 국립원예특작과학원) ;
  • 최학순 (농촌진흥청 국립원예특작과학원) ;
  • 남춘우 (농촌진흥청 국립원예특작과학원) ;
  • 장성회 (세계채소센터 한국사무소)
  • Received : 2022.09.20
  • Accepted : 2022.10.07
  • Published : 2022.10.31
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Abstract

Salicylic acid (SA), a phenolic compound, plays a pivotal role in regulating a wide range of physiological and metabolic processes in plants such as antioxidant cellular defense, photosynthesis, and biotic and abiotic stress responses during the growth and development. We examined the effect of exogenous SA application (100 mg·L-1) on the growth, yield, photosynthetic characteristics, lipid peroxidation, and antioxidant enzyme activity of chili pepper plants under high temperature and drought stress conditions. SA treatment induced increases of net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) under the stress condition with the highest level after the third treatment. The contents of malondialdehyde and H2O2 were significantly lower in the third treatment of SA compared to the control. The activity of ascorbate peroxidase, catalase, peroxidase and superoxide dismutase, increased in treated plants by up to 247, 318, 55 and 54%, respectively compared to the nontreated control. There was no significant difference in the growth characteristics between SA-treated and nontreated plants, while the SA treatment increased marketable yield (kg/10a) by about 15% compared to the nontreated control. Taken together, these results suggest that foliar application of SA alleviates physiological damages caused by the combination of drought and heat stress, and enhances the photosynthetic capacity and antioxidant enzyme activities, thereby improving tolerance to a combination of water deficit and heat stress in chili pepper plants.

살리실산은 식물의 생장 및 발달, 항산화 방어기작, 광합성 작용 그리고 생물적 및 비생물적 스트레스 조건에서 다양한 생리적 기능을 조절하는 물질로 알려져 있다. 본 연구에서는 고온·건조 스트레스 조건에서 살리실산 경엽처리가 고추의 생육, 광합성 특성 및 항산화효소 활성에 미치는 영향을 구명하고자 하였다. 광합성 특성 측정결과 광합성 속도, 기공전도도 및 증산 속도가 증가하였고, 3회차 처리에서 가장 높았다. 세포내 MDA와 H2O2 함량은 살리실산 3회차 처리에서 현저하게 감소하는 경향을 보였다. APX, CAT, POD 및 SOD 활성이 현저하게 증가하였으며, 무처리 대비 최대 247, 318, 55 및 54% 증가하였다. 고추의 생육 특성은 무처리구와 유의한 차이를 보이지 않았으나, 상품 수량은 15% 정도 증가하였다. 이러한 결과들을 종합해 볼 때, 살리실산의 경엽처리는 고추의 광합성 특성과 항산화효소 활성을 증진시켜 고온·건조 스트레스에 의한 피해 경감에 긍정적 효과를 유발함을 확인하였다.

Keywords

Acknowledgement

본 연구는 농촌진흥청 연구사업(과제번호: PJ01501903)의 지원에 의해 수행되었음.

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