Identification of the causal agent of pistachio dieback in Australia

Facelli, E., Taylor, C., Scott, E., Fegan, M., Huys, G., Noble, R., Swings, J. and Sedgley, M. (2005) Identification of the causal agent of pistachio dieback in Australia. European Journal of Plant Pathology, 112 2: 155-165. doi:10.1007/s10658-005-3120-9

Author Facelli, E.
Taylor, C.
Scott, E.
Fegan, M.
Huys, G.
Noble, R.
Swings, J.
Sedgley, M.
Title Identification of the causal agent of pistachio dieback in Australia
Journal name European Journal of Plant Pathology   Check publisher's open access policy
ISSN 0929-1873
Publication date 2005
Sub-type Article (original research)
DOI 10.1007/s10658-005-3120-9
Volume 112
Issue 2
Start page 155
End page 165
Total pages 11
Place of publication Dordrecht
Publisher Springer
Collection year 2005
Language eng
Subject C1
270403 Plant Pathology
770804 Control of pests and exotic species
Abstract Symptoms associated with pistachio dieback in Australia include decline (little or no current season growth), xylem staining in shoots two or more years old, trunk mu and limb lesions (often covered by black, superficial fungal growth), excessive exudation of resin, dieback and death of the tree. Bacteria belonging to the genus Xanthomonas have been suggested as the causal agent. To confirm the constant association between these bacteria and the disease syndrome, the absence of other pathogens and the identity of the pathogen, we performed a series of isolations and pathogenicity tests. The only microorganism consistently isolated from diseased tissue was a bacterium that produced yellow, mucoid colonies and displayed morphological and cultural characteristics typical of the genus Xanthomonas. Database comparisons of the fatty acid and whole-cell protein profiles of five representative pistachio isolates indicated that they all belonged to X. translucens, but it was not possible to allocate the isolates to pathovar. Pathogenicity tests on cereals and grasses supported this identification. However, Koch's postulates have been only partially fulfilled because not all symptoms associated with pistachio dieback were reproduced on inoculated two-year-old pistachio trees. While discolouration was observed, dieback, excessive resinous exudate and trunk and limb lesions were not produced; expression of these symptoms may be delayed, and long-term monitoring of a small number of inoculated trees is in progress.
Keyword Fatty Acid Methyl Esters (fame) Analysis
Whole-cell Protein Profiling
Xanthomonas Translucens
Plant Sciences
Campestris Pv Graminis
Acid Methyl-esters
Bacterial Wilt
Forage Grasses
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 06:10:09 EST