Abstract
Plant pathogenic organisms are known to infect host cell using various range of secretory proteins. Amongst all other secretion systems, type III secretion system (T3SS) is a key mechanism for bacterial pathogenesis for establishing and maintaining infection into the host. Expression levels of seven genes viz. avrXacE1, avrXacE2, hpaA and hrpG along with bacterial endogenous control lrp (leucine-responsive protein) were studied. The pathogenic organisms selected for the present study includes Enterobacter cloacae, Enterobacter spp., Pantoea ananatis, Xanthomonas campestris pv. Citri, Pantoea agglomerans, Ochrobactrum anthropi and Erwinia chrysanthemi. P. agglomerans and Enterobacter spp. gave high expression of above-mentioned virulence genes compared to Xanthomonas, while E. cloacae and P. ananatis showed similar expression with that of Xanthomonas. The detailed relationship of the expression profiles with respect to the selected organisms is discussed.
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