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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Hye-Sook (Division of Biological Sciences, Kangwon National University) Lim, Chang-Jin (Division of Biological Sciences, Kangwon National University) Han, Tae-Jin (Division of Biology, Hallym University) Kim, Joon-Chul (Division of Biological Sciences, Kangwon National University) Jin, Chang-Duck (Division of Biological Sciences, Kangwon National University)
저널정보
한국식물학회 식물학회지 식물학회지 제46권 제1호
발행연도
2003.1
수록면
31 - 37 (7page)

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Foliar spraying of Arabidopsis thaliana (Columbia ecotype) plants with a 1.0-mM salicylic acid (SA) solution significantly improved their tolerance to subsequent paraquat (PQ)-induced oxidative damage. Leaf injuries, including losses of chlorophyll, protein, and fresh weight, were reduced. Our analysis of antioxidant enzymes in the leaves showed that SA pre-treatment effectively retarded rapid decreases in the activities of superoxide dismutase (SOD), catalase, and ascorbate peroxidase that are normally associated with PQ exposure. In addition, guaiacol peroxidase activity was remarkably increased. In a native gel assay of peroxidase (POD) isozymes, staining activity of the POD1 isozyme, which disappeared in plants exposed only to 10 $\mu$M PQ, was significantly recovered by the 1.0-mM SA pre-treatment. POD2 isozyme activity was also pronounced in all SA-treated plants compared with the control. A 12-h SA pre-treatment, without subsequent PQ stress, also caused a small increase in the endogenous $H_2O$$_2$content that accompanies the symptoms of mild leaf injuries. This enhanced level occurred in parallel with a slight SOD increase and a catalase decrease. From our results, it can be assumed that, due to the small increase in SOD as well as catalase inactivation via SA pre-treatment, a moderate increase in $H_2O$$_2$levels may occur. In turn, a large induction of guaiacol peroxidase leads to enhanced PQ tolerance in A. thaliana plants.

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