Plant growth-promoting rhizobacteria (PGPR) are soil bacteria that are able to colonize rhizosphere and to enhance plant growth by means of a wide variety of mechanisms. In the present study M. yunnanensis and S. chelatiphaga strains were recognized as new records in Iran flora. According to results these strains significantly affected plants zinc and phosphorous contents which could be due to production of phyto-siderophore. Siderophore producing bacteria
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