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The type III secretion system is necessary for thedevelopment of a... » Isaúde
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BMC microbiology [electronic resource]
2012-06-07 03:35:04

The type III secretion system is necessary for thedevelopment of a pathogenic and endophyticinteraction between Herbaspirillum rubrisubalbicansand Poaceae

Descrição: Background:Herbaspirillum rubrisubalbicans was first identified as a bacterial plant pathogen, causingthe mottled stripe disease in sugarcane. H. rubrisubalbicans can also associate with variousplants 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/hrcgenes encoding for the type three secretion system (T3SS) proteins. To investigate thecontribution of T3SS to the plant-bacterial interaction process we generated mutant strains ofH. 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 themottled stripe disease in the sugarcane susceptible variety B-4362. These mutant strains alsodid not produce lesions on Vigna unguiculata leaves. Oryza sativa and Zea mays colonizationexperiments 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 involvedin the endophytic colonization.Conclusions:Our results indicate that the T3SS of H. rubrisubalbicans is necessary for the development ofthe mottled stripe disease and endophytic colonization of rice.

Identificador: doi:10.1186/1471-2180-12-98
Volume: 0
Página: 9 a


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