Effects of Plant Growth Promoting Rhizobacteria (PGPR) on Physiological Parameters Against Salinity in Apple Cultivar “Fuji”

Authors : Şeyma ARIKAN, Lütfi PIRLAK

Pages : 281-286

Doi:10.16984/saufenbilder.469522

View : 26 | Download : 13

Publication Date : 2020-04-01

Article Type : Research Paper

Abstract :The present study was conducted with the cultivar ‘Fuji’ grafted on M9 rootstock in both 2014 and 2016 years. The effect of PGPR insert ignore into journalissuearticles values(Bacillus subtilis EY2, Bacillus atrophaeus EY6, Bacillus spharicus GC subgroup B EY30, Staphylococcus kloosii EY37 and Kocuria erythromyxa EY43); were investigated under salt stress conditions. PGPR’s effects were tested on leaf relative water content insert ignore into journalissuearticles values(LRWC);, membrane permeability, stomatal conductivity, photosynthetic activity and chlorophyll content insert ignore into journalissuearticles values(by SPAD-502);. The saplings were grown in pots filled 2:1:1 peat: perlite: sand. Salinity was obtained by NaCl: Na2SO4: CaCl2: MgSO4 insert ignore into journalissuearticles values(7:9:3:1); solution. The solution was applied twice a week with irrigation during the growing period. When the salinity reached 2.5-3.0 dScm-1, the solution application was ended. All bacteria treatments significantly reduced the physiological damage of leaves compared with the salt treatment in both two years. The LRWC range from 13.33 % insert ignore into journalissuearticles values(salt treatment); to 26.76 % insert ignore into journalissuearticles values(control);. The best result of bacteria treatment was measured in EY43 with 23.93 % LRWC. The highest rate of membrane permeability was found in salt treatment insert ignore into journalissuearticles values(30.35 %);. The stomatal conductivity was decreased in the salt application insert ignore into journalissuearticles values(154.35 mmol m-2s-1); unlike EY43 treatment insert ignore into journalissuearticles values(234.44 mmol m-2s-1);. Similarly, EY43 treatment significantly increased photosynthetic activity insert ignore into journalissuearticles values(15.24 µmol CO2 m-2s-1); compared with the salt treatment insert ignore into journalissuearticles values(8.22 µmol CO2 m-2s-1);. As a result, bacteria strains had been ameliorative of the deleterious effects under salt stress on “Fuji”.
Keywords : Salt Stress, Apple, Fuji, PGPR