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- W2118103637 abstract "Sunflower (Helianthus annuus L. cv. SH222) plants and calli were exposed to KCl stress for three weeks. Calli were more tolerant to KCl than plants. KCl stress decreased NO−3, Mn, Fe and B levels in whole plants and P, Ca and Mg in shoots. NO−3, P, Ca, Mg, Mn, and B levels decreased in 100 mM‐stressed calli. Chlorophyll content, Fm and (Fm−F0)/Fm ratio decreased in stressed leaves, while F0 increased only in leaves exposed to severe stress (100 and 150 mM). Membrane permeability and lipid peroxidation increased in plants under all stress conditions and in 100 and 150 mM stressed calli, but remained unchanged in 25 mM stressed calli. Salt stress also induced changes relating to antioxidant enzymes: plants under all stress conditions showed a decrease in catalase, peroxidase and SOD activities. Calli under moderate stress (25 mM KCl) showed an increase of catalase, peroxidase and SOD activities, but the activities of peroxidase and SOD decreased when calli were exposed to higher KCl concentrations. The decrease of antioxidant enzyme activities is in tune with lipid peroxidation and membrane permeability increases. On the other hand, calli adapted for 6 months to 100 mM KCl showed an increase of these enzyme activities compared to unstressed calli, while MDA production and membrane permeability were not significantly affected." @default.
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- W2118103637 date "2001-02-01" @default.
- W2118103637 modified "2023-09-26" @default.
- W2118103637 title "In situ and in vitro senescence induced by KCl stress: nutritional imbalance, lipid peroxidation and antioxidant metabolism" @default.
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- W2118103637 doi "https://doi.org/10.1093/jexbot/52.355.351" @default.
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