אסיף מאגר המחקר החקלאי

Virulence mechanisms and host specificity of gall-forming Pantoea agglomerans

Year:

2007

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Volume :

15

Co-Authors:

Barash, I., Department of Plant Sciences, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 69978, Israel
Manulis-Sasson, S., Department of Plant Pathology and Weed Research, ARO, Volcani Center, Bet Dagan, 50250, Israel

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Abstract:

Pantoea agglomerans has been transformed from a commensal bacterium associated with many plants into a host-specific gall-forming pathogen by acquiring a plasmid-borne pathogenicity island. This pathogenicity island harbors the hrp/hrc gene cluster, in addition to genes encoding type III effector proteins, biosynthesis of the phytohormones indole-3-acetic acid and cytokinin, multiple diverse insertion sequences and pseudogenes. This review describes a unique model for understanding the emergence of new pathogens or new pathogenic variants, offering an insight into the function of type III effectors in host specificity and the evolution of a pathogen into pathovars. It also addresses the primary role of type III effectors in gall initiation as compared with a secondary role of phytohormones secreted by the pathogen. © 2007 Elsevier Ltd. All rights reserved.

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