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Background   Herbaspirillum rubrisubalbicans  was first identified as a bacterial plant pathogen, causing the mottled stripe disease in sugarcane.  H. rubrisubalbicans  can also associate with various plants of economic interest in a non pathogenic manner.    Results  A 21 kb DNA region of the  H. rubrisubalbicans  genome contains a cluster of 26  hrp/hrc  genes encoding for the type three secretion system (T3SS) proteins. To investigate the contribution of T3SS to the plant-bacterial interaction process we generated mutant strains of  H. rubrisubalbicans  M1 carrying a Tn5 insertion in both the  hrcN  and  hrpE  genes.  H. rubrisulbalbicans hrpE  and  hrcN  mutant strains of the T3SS system failed to cause the mottled stripe disease in the sugarcane susceptible variety B-4362. These mutant strains also did not produce lesions on  Vigna unguiculata  leaves.  Oryza sativa  and  Zea mays  colonization experiments showed that mutations in  hrpE  and  hrcN  genes reduced the capacity of  H. rubrisulbalbicans  to colonize these plants, suggesting that  hrpE  and  hrcN  genes are involved in the endophytic colonization.    Conclusions  Our results indicate that the T3SS of  H. rubrisubalbicans  is necessary for the development of the mottled stripe disease and endophytic colonization of rice.

bmc microbiology

The type III secretion system is necessary for the development of a pathogenic and endophytic interaction between Herbaspirillum rubrisubalbicans and Poaceae