Isolation of Native Xenorhabdus Bacteria from Steinernema spp. and Role of Their Exo and Endo Metabolites for Suppression of Root-Knot Nematodes (Meloidogyne spp.) on Tomato

Isolation of native Xenorhabdus bacteria from Steinernema spp. and their exo- and endo-metabolites were tested for management of root-knot nematodes (Meloidogyne spp.) on tomato during 2003–2004. All the native Xanorhabdus (Xeno) isolates showed biochemical reactions which were characteristic features of this genus. Moreover, native Xenorhabdus isolates exhibited a positive reaction for lecithinase and negative reaction for lipase, protease and chitinase. The total exo-proteins (mg/ml) produced by Xeno Sc culture was higher whereas, Xeno Sr M and OH exhibited an equal quantity of protein production followed by Xeno SA. Both exo- and endo-metabolites of Xenorhabdus spp. showed suppressive effect against M. incognita and M. javanica pt. 2 on tomato in pots.