Protective Role of Exogenous Spermidine against Paraquat Toxicity in Radish Chloroplasts
Ahn, S.M.;Jin, C.D.(Kangwon National University, Chunchon, Republic of Korea)E-mail:cdjin@kangwon.ac.kr
When radish chloroplasts were pretreated with 1 mM spermidine (Spd) and then exposed to 30 M paraquat (PQ), they improved their tolerance to subsequent PQ-induced oxidative damages. That included the decreases in the contents of chlorophyll, protein, and ascorbate, as well as the increases in malondialdehyde (MDA) and H₂O₂ levels. Analysis of antioxidant enzymes showed that Spd pretreatment effectively prevented the PQ-induced decreases in the total activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX).
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