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Kinetics of the Anti‐oxidant Response to Salinity in the Halophyte Cakile maritima
Author(s) -
Amor Nader Ben,
Jiménez Ana,
Megdiche Wided,
Lundqvist Marianne,
Sevilla Francisca,
Abdelly Chedly
Publication year - 2007
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/j.1672-9072.2007.00491.x
Subject(s) - apx , halophyte , glutathione reductase , malondialdehyde , catalase , chemistry , peroxidase , salinity , superoxide dismutase , antioxidant , glutathione , reductase , botany , food science , biochemistry , glutathione peroxidase , biology , enzyme , ecology
The effects of NaCl stress on the activity of anti‐oxidant enzymes (superoxide dismutase, catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX), monodehydroascorbate reductase, dehydroascorbate reductase (DHAR), and glutathione reductase (GR)), anti‐oxidant molecules (ascorbate and glutathione), and parameters of oxidative stress (malondialdehyde (MDA), electrolyte leakage, and H 2 O 2 concentrations) were investigated in Cakile maritima , a halophyte frequent along the Tunisian seashore. Seedlings were grown in the presence of salt (100, 200, and 400 mmol/L NaCl). Plants were harvested periodically over 20 days. Growth was maximal in the presence of 0–100 mmol/L NaCl. At 400 mmol/L NaCl, growth decreased significantly. The salt tolerance of C. maritima , at moderate salinities, was associated with the lowest values of the parameters indicative of oxidative stress, namely the highest activities of POD, CAT, APX, DHAR, and GR and high tissue content of ascorbate and glutathione. However, prolonged exposure to high salinity resulted in a decrease in anti‐oxidant activities and high MDA content, electrolyte leakage, and H 2 O 2 concentrations. These results suggest that anti‐oxidant systems participate in the tolerance of C. maritima to moderate salinities.