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Research Journal of Microbiology
Year: 2010  |  Volume: 5  |  Issue: 9  |  Page No.: 849 - 857

Influence of Selective Herbicides on Plant Growth Promoting Traits of Phosphate Solubilizing Enterobacter asburiae Strain PS2

M. Ahemad and M.S. Khan    

Abstract: This study examines the effect of four herbicides, quizalafop-p-ethyl, clodinafop, metribuzin and glyphosate, on plant growth promoting activities, like, phosphate solubilization, siderophores, indole acetic acid, exo-polysaccharides, hydrogen cyanide and ammonia production by herbicide tolerant Enterobacter asburiae strain PS2 isolated from mustard rhizosphere. The selected herbicides were applied at recommended, two and three times the recommended rates. The activities of E. asburiae strain PS2 observed under in vitro environment were persistent for all herbicides at lower rates which however, decreased regularly, but not lost completely, as the concentration of each herbicide was increased from lower to higher one. Herbicides at recommended dose had less inhibitory effect while the dose higher than the recommended one adversely affected the plant growth promoting traits of E. asburiae strain PS2. Among all herbicides, quizalafop-p-ethyl generally, showed maximum toxicity to plant growth promoting activities of this bacterium. The order of herbicide toxicity at highest dose rate for each herbicide was observed as quizalafop-p-ethyl>clodinafop>glyphosate>metribuzin for phosphate solubilizing potential; quizalafop-p-ethyl>glyphosate>clodinafop> metribuzin for salicylic acid synthesis; quizalafop-p-ethyl>clodinafop = glyphosate >metribuzin for 2, 3-dihydroxybenzoic acid and quizalafop-p-ethyl>clodinafop> glyphosate>metribuzin for indole acetic acid production. In contrast E. asburiae strain PS2 produced higher exo-polysaccharides on increasing concentration of each herbicide. At three times the recommended rate of each herbicide, the order of induction in exo-polysaccharides secretion by E. asburiae strain PS2 was found as clodinafop>quizalafop-p-ethyl>metribuzin>glyphosate. The herbicide tolerance together with growth promoting activities shown under herbicide stress suggests that E. asburiae strain PS2 could be used as inoculant for raising the productivity of crops even in soils poisoned with herbicides.

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