The effects of exogenous sodium nitroprusside (SNP, nitric oxide donor) on the growth, yield, photosynthetic characteristics, and antioxidant enzyme activity of kimchi cabbage (Brassica rapa L. subsp. pekinensis (Lour.) Hanelt) was studied under the low temperature conditions. Kimchi cabbages were treated with SNP of three concentrations (7.5, 15, 30 mg·L-1) for three times at four-day intervals and exposed to low temperature (16/7°C) stress for seven days. SNP treatment induced increases of net photosynthetic rate (Pn), stomatal conductance (Gs), intracellular CO2 concentration (Ci) and transpiration rate (Tr) under the stress condition with the highest level after the third treatment. The contents of malondialdehyde (MDA) and H2O2 were significantly lower in the treatment of SNP compared to the non-treated control. The activity of ascorbate peroxidase (APX), catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD), increased in treated plants by up to 38, 187, 24 and 175%, respectively compared to the non-treated control. SNP-treated and untreated plants had similar growth characteristics. Compared to the control group, SNP-treatment increased fresh weight and leaf area by 5%. Overall, our findings suggest that the application of sodium nitroprusside to the leaves contributes to reducing physiological damage and enhancing the activities of antioxidant enzymes, thereby improving low temperature stress tolerance in kimchi cabbage.

서 론
재료 및 방법
    1. 실험 재료 및 SNP 처리
    2. 광합성 측정
    3. 단백질 정량 및 malondialdehyde(MDA), H2O2 함량분석
    4. 항산화효소 활성 분석
    5. 생육 특성 조사
    6. 통계분석
결과 및 고찰
    1. 배추의 광합성 특성 변화
    2. 배추의 MDA 및 H2O2 함량 변화
    3. 항산화효소 활성 변화
    4. 생육 특성 변화
적 요
사 사

• 이진형(농촌진흥청 국립원예특작과학원 박사후연구원) | Jinhyoung Lee (Postdoctoral Researcher, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea)
• 위승환(농촌진흥청 국립원예특작과학원 농업연구사) | Seunghwan Wi (Research Officer, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea)
• 이혜진(농촌진흥청 국립원예특작과학원 농업연구사) | Hyejin Lee (Research Officer, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea)
• 이상규(농촌진흥청 국립원예특작과학원 농업연구관) | Sanggyu Lee (Senior Research Officer, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea)
• 강민서(농촌진흥청 국립원예특작과학원 석사후연구원) | Minseo Kang (Post-graduate Researcher, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea)
• 김태양(농촌진흥청 국립원예특작과학원 석사후연구원) | Taeyang Kim (Post-graduate Researcher, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea)
• 장성회(세계채소센터 한국사무소 소장) | Seonghoe Jang (Country Director, World Vegetable Center Korea Office (WKO), Wanju 55365, Korea)
• 이희주(농촌진흥청 국립원예특작과학원 농업연구관) | Heeju Lee (Senior Research Officer, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea) Corresponding author