By G. A. Beattie, S. E. Lindow (auth.), Jeffery L. Dangl (eds.)
The final decade has visible an explosion in our realizing of ways bacterial pathogens trick, cajole, usurp and parasitize their a variety of hosts. This renaissance is because of the convergence of molecular and mobile recommendations with the facility of microbial genetics. the aim of this quantity is to introduce fresh advances in knowing chosen structures selected from either plant and animal hosts of bacterial pathogens. This a bit nonobvious number of subject matters was once spurred by means of the new findings, certain by way of a number of conributors to this quantity, of universal structures used to secrete virulence elements from pathogens of either crops and animals. those serendipitous findings underscored the significance of simple learn ways to parallel difficulties in biology. extra importantly, they introduced jointly investigators who won't have another way turn into conversant with every one other's experimental platforms. I, for one, locate the types of synergism mirrored in a quantity of this type to be some of the most friendly points of technology and wish that the reader, even if a newcomer to the sector or a professional, can discover a new slant to outdated difficulties within the studies contained h,E:lre. It was once, besides the fact that, essential to restrict quantity size, and this has compelled the exclusion of a few interesting bacterial pathosystems.
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Additional info for Bacterial Pathogenesis of Plants and Animals: Molecular and Cellular Mechanisms
Appl Environ Microbiol 59: 410-416 Wyman JG, VanEtten HD (1982) Isoflavonoid phytoalexins and nonhypersensitive resistance of beans to Xanthomonas campestris pv. phaseoli. Phytopathology 72: 1419-1424 Xu GW, Gross DC (1988) Evaluation of the role of syringomycin in plant pathogenesis by using Tn5 mutants of Pseudomonas syringae pv. syringae defective in syringomycin production. s. pv. syringae on pear. Proceedings of the 8th international conference on plant pathogenic bacteria (in press) Pathogenicity Determinants and Global Regulation of Pathogenicity of Xanthomonas campestris pv.
39 1 Introduction Xanthomonas campestris pathovar campestris (hereafter Xc. campestris) , the causal agent of black rot of crucifers, is a phytopathogenic bacterium of great economic importance (WILLIAMS 1980; ONSANDO 1992; SCHAAD and ALVAREZ 1993). Molecular genetic methods have now allowed a number of genes encoding pathogenicity determinants of Xc. campestris and related pathovars to be identified. In this chapter we will briefly review some of these and discuss our current understanding of the regulation of pathogenicity in this bacterium.
J. Daniels -.. rpfA rp/B rp/F ~~~r-~~~~--~ I I I 1i---7'rl-------< ca. 2 kb rpjC rpfHrpfG(lysU ... prjB) rpfD rp/E Fig. 1. Organisation of positive regulatory gene cluster of Xanthomonas campestris pathovar campestris. Boxes indicate regions which have been sequenced. Arrows indicate direction of transcription The regulatory effects of the autoinducers are only exerted at concentrations found in dense bacterial cultures. Hence autoinducers may be viewed as regulators responding to high density, or ..