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A survey of bacterial endophytes associated with the leaves of oil palm and acacias resulted in the isolation of 19 bacterial strains belonging to the genera  Paraburkholderia, Caballeronia , and  Chitinasiproducens , which are now regarded as distinctively different from the parent genus  Burkholderia . Most strains possessed one or more plant growth promotion (PGP) traits although nitrogenase activity was present in only a subset of the isolates. The diazotrophic  Paraburkholderia tropica  strain S39-2 with multiple PGP traits and the non-diazotrophic  Chitinasiproducens palmae  strain JS23 T  with a significant level of 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity were selected to investigate the influence of bacterial inoculation on some economically important tree species. Microscopic examination revealed that  P. tropica  S39-2 was rhizospheric as well as endophytic while  C. palmae  JS23 T  was endophytic.  P. tropica  strain S39-2 significantly promoted the growth of oil palm, eucalyptus, and  Jatropha curcas . Interestingly, the non-diazotrophic, non-auxin producing  C. palmae  JS23 T  strain also significantly promoted the growth of oil palm and eucalyptus although it showed negligible effect on  J. curcas . Our results suggest that strains belonging to the novel  Burkholderia- related genera widely promote plant growth via both N-independent and N-dependent mechanisms. Our results also suggest that the induction of defense response may prevent the colonization of an endophyte in plants.

Plant Growth Promoting Abilities of Novel Burkholderia-Related Genera and Their Interactions With Some Economically Important Tree Species