Isolation, Identification and Evaluation of Azospirillum Inoculation on Tomato Growth under Green-House Conditions

Azospirillum is a well-studied genus of plant growth-promoting bacteria. Phytohormone production by PGPR is considered as one of the effective factor to increase the tomato yield significantly. In order to study the effect of Azospirillum inoculant on on Growth Characteristics and Yields of Tomato، three strain of Azospirillum were isolated، identified، and purified from Tehran suburb soils. Tomato seeds were inoculated by those isolated strains of Azospirillum and tomato seedlings were grown under the greenhouse condition. At the end of grown periodof tomato plant، stem length، root length، leaf and branch fresh weight، root fresh weight، root bulk، leaf and branch dry weight and root dry weight were measured. The results showed that tomato seed inoculation had significant effect on all measured characteristics except the length of root. Inoculation of tomato seed with Azospirillum increased the bulk and dry weight of root and consequently it attributed to increased uptake of plant nutrient. It seems that Azospirillum inoculants have a beneficial effect on tomato growth.