Mitigation effects of glycinebetaine on oxidative stress and some key growth parameters of maize exposed to salt stress

Authors : Cengiz KAYA, Osman SÖNMEZ, Salih AYDEMİR, Murat DİKİLİTAŞ

Pages : 188-194

Doi:10.3906/tar-1205-18

View : 17 | Download : 7

Publication Date : 2013-04-01

Article Type : Research Paper

Abstract :The aim of the current study was to investigate the effects of glycinebetaine insert ignore into journalissuearticles values(GB); on oxidative stress and some key growth parameters in maize insert ignore into journalissuearticles values(Zea mays L. `DK 647 F1`); grown under saline conditions. Maize seedlings were grown in pots containing perlite. The experiment was designed in a 2 × 2 factorial arrangement with 2 levels insert ignore into journalissuearticles values(0 and 100 mM); of sodium chloride insert ignore into journalissuearticles values(NaCl); and 2 levels insert ignore into journalissuearticles values(25 and 50 mM); of GB sprayed onto leaves of maize seedlings. Saline stress caused a considerable decline in total dry matter, chlorophyll content, relative water content insert ignore into journalissuearticles values(RWC);, peroxidase insert ignore into journalissuearticles values(POD; EC. 1.11.1.7);, and catalase insert ignore into journalissuearticles values(CAT; EC. 1.11.1.6);; however, it increased proline, polyphenol oxidase insert ignore into journalissuearticles values(PPO; 1.10.3.1);, and electrolyte leakage. Foliar application of both GB doses mitigated the deleterious effects of salinity stress to variable extents on the key growth parameters tested. As expected, sodium insert ignore into journalissuearticles values(Na+); concentrations were higher in the tissues of plants grown under saline conditions, and the GB treatments significantly reduced Na+ concentration in the plant tissues. Salinity stress reduced both calcium insert ignore into journalissuearticles values(Ca2+); and potassium insert ignore into journalissuearticles values(K+); in the leaves, and GB treatments increased concentrations of both elements in plant tissues; however, their levels were still lower than control values. In particular, foliar application of 50 mM GB mitigated some of the deleterious effects of salt stress by improving proline, Ca2+, and K+ levels and maintaining membrane permeability.
Keywords : Key words Antioxidant enzyme, nutrient acquisition, salt stress, salt tolerance, Zea mays