insights about xylella
Biology, genetics and pathogenicity of XF
Xylella fastidiosa (Xf) is a xylem-limited, plant-pathogenic bacterium with a wide host range. Processes leading to plant colonization and the specific mechanisms leading to disease are poorly understood yet.
Although a study investigating the mechanisms of host plant specificity experimentally showed that cell-cell signaling-based gene regulation system was associated with host specificity, the target candidate loci could not be identified and therefore the question remains largely open.
Thus, there is high uncertainty with regard to the potential host range of Xf in the European flora as a wide range of European wild plant species have never been exposed to the bacterium and it is not known whether they would be hosts, and, if so, whether they would develop symptoms.
To this end, the importance of experimental work to determine the host range of pathogens remains paramount to demonstrate that individual genotypes are pathogenic to specific host plant species. Large dataset of genomic sequences will be cooperatively developed within this project, to gather critical elements to understand the evolution of the population in the contaminated areas, and to identify critical parameters involved in Xf-host interaction that could be used to design novel control methods.
Molecular characterization of EU Xf genotypes coupled with biological tests on host range and analysis of ecological parameters will be essential in the development of quarantine, containment, and control practices.
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Several subspecies and sequence types are associated with the emergence of Xylella fastidiosa in natural settings in France
Authors: N Denance, B Legendre, M Briand, V Olivier, C de Boisseson, F Poliakoff and M-A Jacques Summary: Xylella fastidiosa is a plant pathogenic bacterium emerging in Europe. In France its emergence has been evidenced through interceptions of contaminated coffee...
Assessment of the genetic diversity of Xylella fastidiosa in imported ornamental Coffea arabica plants
Authors; M. Bergsma-Vlami, J.L.J van de Bilt, N.N.A. Tjou-Tam-Sin, C.M. Helderman, P.P.M.A. Gorkink-Smits, N.M. Landman, J.G.W. van Nieuwburg, E.J. van Veen and M. Westenberg Abstract: A study has been performed in order to assess the presence of Xylella fastidiosa in...