Iman Ibrahim* ⁽¹⁾ Najwa Muslmani ⁽¹⁾ Imad aldeen ALKhalaf ⁽¹⁾ and Abeer alramo ⁽¹⁾

(1). Dept of Biology, Faculty of Science, Aleppo University, Aleppo, Syria.

(*Corresponding author: Iman Ibrahim E-mail iman.sy@hotmail.com).

Received:26/08/2022            Accepted:9/10/2022

Abstract: 

The research aimed to investigate the ability of bacteria isolated from the celery rhizosphere to stimulate plant growth in pot experiments. A bacterial inoculum was prepared at a concentration of (5×10^-8) cfu/ml of five isolate species belonging to two genera (Bacillus and pseudomonas), which is:  Pseudomonas putida,  P. aeruginosa subtilis, Bacillus cereus B.,  B. thuringiensis, Celery seeds were soaked in the concentrations prepared from these isolates for four hours, then the seeds were planted in pots. after the plant growth period was completed, the ability of plant growth-promoting rhizobacteria (PGPR) to increase vegetative growth and biochemical indicators was studied. the results showed that the bacterial isolates were able to improve growth by increasing the lengths of the root and shoot and increasing the fresh weights of the plant. the number of leaves and roots also increased by the effect of the bacterial inoculum. In addition, the plants treated with the PGPR recorded an increase in chlorophyll (A, B, and total chlorophyll) and carotenoids. The results also showed the positive effect of the bacterial inoculum in increasing the total content of phenols and the antioxidant activity in all tested plants.

Keywords: celery. bacterial inoculum. PGPR. Phenols. antioxidant activity.

Full paper in Arabic: pdf