Using gel electrophoresis and in comparison with
control plants, a new protein band was detected in the protected cucumber plant extracts (molecular
weight of about 30 KDa), assuming to be a plant pathogen related protein. Increase in growth
measures was observed for Azotobacter and Pseudomonas treated cucumber plants, as the higher
plant dry weights were 16.1 and 13.8 gm, respectively. Statistical lowest significant differences test
(LSD) showed significant differences between Azotobacter and Pseudomonas results for biological
data of plant dry weights.