Pseudomonas
isolates have frequently been isolated from the rhizosphere of plants, and several of them have been reported as plant growth-promoting rhizobacteria. In the present work, tomato (
Solanum lycopersicum
) seeds were germinated in greenhouse conditions, and the seedling height, length of plants, collar diameter and number of leaves were measured from plants grown in soil inoculated by bacterial isolates.
Pseudomonas
isolates were isolated from the rhizosphere. We used the Newman-Keuls test to ascertain pairwise differences. Isolates were identified as a new
Pseudomonas
species by
rpo
D gene sequencing. The results showed that isolates of
Pseudomonas
sp. (Q6B) increased seed germination (P = 0.01);
Pseudomonas
sp. (Q6B, Q14B, Q7B, Q1B and Q13B) also promoted seedling height (P = 0.01). All five isolates promoted plant length and enlarged the collar diameter (P = 0.01).
Pseudomonas
sp. (Q1B) also increased leaf number (P = 0.01). The investigation found that
Pseudomonas
isolates were able to solubilize phosphate, produce siderophores, ammonia, and indole-3-acetic acid and colonize the roots of tomato plants. This study shows that these five novel
Pseudomonas
sp. isolates can be effective new plant growth-promoting rhizobacteria.
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