Modulation of osmotic adjustment and antioxidant status in salt-stressed leaves of Thermopsis turcica

• Autorzy: Yildiztugay E. , Ozfidan-Konakci C. , Kucukoduk M.
• Języki publikacji: EN

Abstrakty

EN

Thermopsis turcica is distributed naturally in saline soils. Interestingly, how T. turcica can live in harsh salt conditions is unknown. To study its defense responses under salinity, T. turcica was grown in a medium containing 100 and 200 mM NaCl for 7 and 14 days. Physiological parameters, ion contents, reactive oxygen species accumulation, activities of antioxidant enzymes/isozymes, NADPH oxidase enzyme/isozyme, lipid peroxidation (TBARS) and osmolyte contents were investigated. Stress caused a rapid decline in relative growth rate, relative water content and chlorophyll fluorescence (Fv/Fm) under both NaCl treatments. These traits were more suppressed at 200 mM NaCl. The decline in osmotic potential (WP) with salinity increased the gradient for water flux into the cell and assisted in turgor maintenance. The increased membrane permeability under stress caused the entrance of excess Na⁺ and K⁺ into the cell. Stress decreased superoxide dismutase, catalase and peroxidase after 14 days of growth in 200 mM NaCl, whereas glutathione reductase (GR) increased throughout the experiment. While ascorbate peroxidase (APX) increased by 44 % at 7 days, it decreased after 14 days exposure to 200 mM NaCl. 200 mM NaCl caused the highest increase in TBARS at 14 days, indicating a decrease in OH scavenging activity. Increasing concentrations of salinity caused an increase in glycine betaine (GB) and choline (Cho), though an increase in proline was only observed at 200 mM NaCl for 14 days. Briefly, H₂O₂ was more efficiently eliminated in 100 mM-treated plants by the ascorbate–glutathione cycle in which APX acts a strong catalyst together with GR. Also, Cho and GB help to maintain osmotic adjustment and cytoplasmic function.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2014
• Tom: 36
• Numer: 01
• Opis fizyczny: p.125-138,fig.,ref.

Twórcy

autor

Yildiztugay E.

• Department of Biology, Faculty of Science, Selcuk University, Selcukle, 42031 Konya, Turkey

autor

Ozfidan-Konakci C.

• Department of Molecular Biology and Genetics, Faculty of Science, Necmettin Erbakan University, Meram, 42090 Konya, Turkey

autor

Kucukoduk M.

• Department of Biology, Faculty of Science, Selcuk University, Selcukle, 42031 Konya, Turkey

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Identyfikatory

DOI

10.1007/s11738-013-1393-8