Abstract
Plant pathogenic bacteria possess sophisticated mechanisms to help evade host defenses. These evasive mechanisms are highly evolved and conserved. Distinctive cell surface components are elaborated to prevent recognition by the host defense system that would result in the hypersensitivity reaction (HR) if the bacterial cell is recognized. It has been long viewed that the HR is a host-defense response. Since there are many different compounds that cause HR, it is plausible that the detection system of the host is non-specific and equipped with an “universal receptor” or “universal detector”. It is also plausible that the compatible plant pathogenic bacteria elaborate a compound that suppresses HR. The hrpX gene of Xanthomonas campestris pathovars and X. oryzae confer an anti-defense system since that loss of this gene results in HR in the compatible host. Likewise, Agrobacterium tumefaciens and A. rhizogenes produce substances that suppress HR in a wide range of plants. Tn5 insertional mutants have revealed the presence of a chromosomal locus involved in this suppression. These findings strongly suggest that there are mechanisms operating that suppress defense responses in the plant and that evade triggering majors defense responses.
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Abbreviations
- HR:
-
Hypersensitive Reaction
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Kado, C.I. (1994). Anti-host-defense systems are elaborated by plant pathogenic bacteria. In: Kado, C.I., Crosa, J.H. (eds) Molecular Mechanisms of Bacterial Virulence. Developments in Plant Pathology, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0746-4_41
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DOI: https://doi.org/10.1007/978-94-011-0746-4_41
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