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고온, 건조 스트레스 조건에서 멜라토닌 경엽처리에 의한 배추의 생장 및 항산화효소 활성 증대
이진형(Jinhyoung Lee),이희주(Heeju Lee),위승환(Seunghwan Wi),유인호(Inho Yu),여경환(Kyung-Hwan Yeo),안세웅(Sewoong An),장윤아(Yoonah Jang),장성회(Seonghoe Jang) 한국원예학회 2021 원예과학기술지 Vol.39 No.5
Melatonin, an indoleamine molecule, regulates a wide range of physiological functions during the growth, morphogenesis, and response of plants to abiotic stresses. We examined the effect of exogenous melatonin application (5, 10, and 20 mg·L<SUP>-1</SUP>) on the growth and antioxidant enzyme activity of Kimchi cabbage under high temperature (air temperature 32/26°C) and drought stress (soil moisture 20-24%) conditions. Application of 10 mg·L<SUP>-1</SUP> melatonin alleviated stress-induced growth inhibition and increased the shoot fresh weight and the leaf surface area of seedlings by 22.7% and 13.9%, respectively, compared to the control under the stress condition. Indeed, foliar application of melatonin at 10 mg·L<SUP>-1</SUP> caused an increase of net photosynthetic rate and transpiration rate under the stress condition. The lowest level of H₂O₂ content was also observed at 10 mg·L<SUP>-1</SUP> concentration of melatonin treatment, while no significant alterations in lipid peroxidation or concentrations of malondialdehyde were detected by treatment with different concentrations of melatonin. In addition, significantly elevated activity levels of ascorbate peroxidase (APX) and superoxide dismutase (SOD) were measured at 10 mg·L<SUP>-1</SUP> melatonin treatment without significant changes in ascorbic acid (AsA) and proline contents under the stress condition. These results suggest that foliar application of 10 mg·L<SUP>-1</SUP> melatonin ameliorates physiological damages caused by the combination of water deficit and heat stress and enhances the activity of the antioxidant enzymes such as APX and SOD, thereby improving tolerance against the water deficit and heat stress in Kimchi cabbage.