Abstract
Although many bacterial species have been isolated from the rhizosphere of various crop plants, the recent discovery is <i>Burkholderia</i> sp., an endophytic bacterium. In this study, the <i>Burkholderia</i> isolates <i>viz</i>., RB<sub>1</sub> (Rice <i>Burkholderia</i> 1), MB2 (Maize <i>Burkholderia</i> 2), SB<sub>3</sub> (Sugarcane <i>Burkholderia</i> 3) and BB<sub>4</sub> (Black gram <i>Burkholderia</i> 4) were enumerated from the root, stem and leaf samples of four different crops <i>viz</i>., rice, maize, sugarcane and black gram using N-free BAz (<i>Burkholderia</i> Azelaic acid) medium, in which black gram roots were observed higher population. Further, growth promoting activities of the <i>Burkholderia</i> isolates were examined, the maximum production of IAA and GA was noticed on the BB<sub>4</sub> as compared to other isolates and the cytokinin production was recorded more in isolates SB<sub>3</sub> followed by BB<sub>4</sub>. Among the four isolates, maximum amount of salicylate type was noticed in RB<sub>1</sub> and catechol type was recorded higher in BB<sub>4</sub> which showed that these isolates were capable to produce Siderophore. The ACC deaminase activity of the isolates were exhibited, the BB<sub>4</sub> was recorded more followed by SB<sub>3</sub>. Therefore, the endophytic <i>Burkholderia</i> isolates also the important contributor to the crop growth through secretion of growth promoting substances, production of siderophore and ACC deaminase activities may improve the Agriculture production.
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