Özet:

In this study the bacterial strains had been isolated from the rhizosphere and phyllosphere of wild and traditionally cultivated plants growing in the Eastern Anatolia Region of Turkey. The present study used a total of 60 Plant Growth-Promoting Rhizobacterial (PGPR) strains belonging to 9 different genera (including Pantoea, Bacillus, Pseudomonas, Peanibacillus, Agrobacterium, Acinetobacter, Brevibacillus, Cellulomonas and Micrococcus sp.), which are known to increase the tolerance to abiotic stress. The hormone and amino acid contents of PGPR were determined under drought stress by the addition of polyethylene glycol (PEG6000). Our results showed that, drought stress generally increased the amino acid and hormone contents of the bacteria. While significant increases in amino acid contents were found in Pantoea agglomerans (RK-92, KIN-99 and RK-205), Bacillus megaterium (TV-20E and TV-22B), Bacillus subtilis (BA-140 and TV-17C), Pseudomonas flourescens (K-22B and FDG-37), Bacillus pumilus (TV-67C and TV-83A), Brevibacillus brevis (FD-1), Micrococcus luteus (TV-91B), Peanibacillus polymyxa (KIN-37), Pseudomonas chlororaphis (İK-38), Pseudomonas putida (BA-8); hormone contents were significantly increased in Bacillus pumilus RK-103, Bacillus sphaericus FD-48 and Peanibacillus polymyxa KIN-37. These findings suggest that, PGPR may be used to decrease the loss of yield in the drought stress by inducting the systemic tolerance of the plants.

Anahtar Kelimeler: