Physiological and antioxidant response of three cultivars of cucumber (Cucumis sativus L.) to salinity

Authors : Gökçen BAYSAL FURTANA, Rukiye TIPIRDAMAZ

Pages : 287-296

View : 24 | Download : 9

Publication Date : 2010-12-01

Article Type : Research Paper

Abstract :The effects of salinity on the growth, relative water content insert ignore into journalissuearticles values(RWC);, chlorophyll content, inorganic ions, proline accumulation, lipid peroxidation and antioxidant enzymes, superoxide dismutase insert ignore into journalissuearticles values(SOD);, ascorbate peroxidase insert ignore into journalissuearticles values(APOX);, and catalase insert ignore into journalissuearticles values(CAT); of 3 cucumber insert ignore into journalissuearticles values(Cucumis sativus L.); cultivars insert ignore into journalissuearticles values(Çengelköy, Anadolu F1, and Beith Alpha); were investigated. Cucumber cultivars were grown in perlite culture and irrigated with half-strength Hoagland nutrient solution for a period of 35 days under controlled conditions. After this period, seedlings were treated with 150 mM NaCl solution and the plants were harvested on day 7 and day 14 of salt treatment. The fresh and dry weights, RWC, inorganic ions, total chlorophyll, proline and malondialdehyde insert ignore into journalissuearticles values(MDA); content, and SOD, CAT, and APOX activities were determined. In general, the applied salinity affected all of the considered parameters depending on the duration of salt treatment and the cultivars analyzed. Proline content also increased with salinity, but accumulation of proline was lower in Çengelköy than in the other cultivars. The results suggest that the protection mechanism against oxidative damage due to induced activity of antioxidant enzymes may be better in Çengelköy than in Beith Alpha or Anadolu F1. The higher K+ concentrations, RWC, total chlorophyll content, and SOD, CAT, and APOX activities, together with the lower MDA, proline content, and Na+ and Cl- concentrations detected in Çengelköy might make this cultivar more salt-tolerant than Beith Alpha or Anadolu F1.
Keywords : Key words Salinity, cucumber, proline, chlorophyll, malondialdehide, antioxidant enzymes