Rapid identification of Ralstonia solanacearum by the direct colony TLC and simple TLC

Rapid identification of bacterial wilt pathogen, Ralstonia solanacearum was conducted by the direct colony TLC and simple TLC methods. All fourteen is olates from different host plants in Bangladesh exhibited similar chromatog rams with R. solanacearum ATCC 11696 the type strain by the direct colony T LC method. This result indicated that all the isolates were R. solanacearum . Physiological and biochemical tests on the fourteen isolates also verifie d that they were R, solanacearum. Seven strains collected in Bangladesh and Japan showed also identical chromatograms with the type strain by the simp le TLC method. A benchmark spot under the common spot was detected in all i solates and strains at the direct colony TLC and simple TLC. Although the d irect colony TLC and simple TLC methods showed the similar results, the sim ple TLC method was found less time consuming and easier than the direct col ony TLC.