Salicylic acid up-regulates the expression of chloroplastic Cu, Zn-superoxide dismutase in needles of maritime pine (Pinus pinaster Ait.)

Abstract

-Several studies have supported a major role of salicylic acid in modulating plant response against abiotic and biotic stresses, by induction antioxidant capacity. In this work, a full-length cDNA encoding a Cu,Zn -superoxide dismutase was isolated by screening a Pinus pinaster needle cDNA library. The predicted protein of 215 amino acid residues has a molecular mass of 22.1 kDa and exhibits a N-terminal transit peptide, which putatively targets the protein to the chloroplast. Treatment of pine seedlings with salicylic acid resulted in the increase of chloroplastic Cu,Zn superoxide dismutase transcript levels in needles, suggesting a role of this isoform in salicylic acid-mediated H 2 O 2 increase in chloroplasts. Pinus pinaster / acide salicylique / Cu,Zn-SOD chloroplastique

Salicylic Acid and Drought Stress Response: Biochemical to Molecular Crosstalk

“…Thus, it may be possible that endogenous SA induces the protective mechanism under drought stress. SA stimulates the activity of Cu and Zn SOD and finally increases the level of H 2 O 2 (Rao et al 1997;Azevedo et al 2004). Higher H 2 O 2 level and lipid peroxidation are involved in the signal transduction process and provide SA-dependent resistance (Anderson et al 1998).…”

Effect of fluorine position on the coordinating ability of fluorosalicylic acids — An experimental study complemented with computations

“…An interesting observation is that their biological effect is influenced significantly by the fluorine position on the aromatic ring: 3-FSA is much more effective than the non-substituted compound (the activity doubled), while the efficacy of 6-FSA is much lower [27]. The full mechanism of action is unclear yet, but it is known that salicylates induce the accumulation of pathogenesis-related (PR) proteins, with copper-containing enzymes among them [28][29][30][31][32]. Thus, a number of observations prove the common effect of copper(II) ions and salicylate in the above process [33][34][35][36].…”