Studies On Plant Growth Regulators And Enzymes Production By Some Bacteria

Abstract

Twenty four bacterial strains of thallobacteria belonging to genus Streptomyces were tested for their potentialities to produce plant growth regulators and some hydrolases in shake cultures. Seven strains namely; Streptomyces alboviridis, S. griseoviridis, S. olivaceoviridis, S. rimosus, S. phaeochromogenes, S. rochei and Streptomyces sp. No. 20, proved to possess comparatively high capacities for production of auxins, gibberellins and cytokinin-like substances together with substantial levels of a- amylase and protease. Moderate capacities were exhibited by S. albidoflavus, S. albus, S. casesius, S. citreus, S. griseinus, S. scabies, Streptomyces sp. No. 21, S. tetranusemus, S. violaceus and S. viridosporus. The remaining seven strains produced comparatively low levels of growth regulators and enzymes. The maximum production of growth regulating substances and enzymes by S. olivaceoviridis and S. rimosus was attained after 84 hrs, but at 60 hrs for S. rochei.