NDLI: Morphological and genotypic features of Xanthomonas arboricola pv. juglandis populations from walnut groves in Romagna region, Italy

Content Provider	Springer Nature Link
Author	Giovanardi, Davide Bonneau, Sophie Gironde, Sophie Saux, Marion Fischer Le Manceau, Charles Stefani, Emilio
Copyright Year	2015
Abstract	Seventy-seven Xanthomonas arboricola pv. juglandis isolates, originating from a small region (Romagna, Italy) within 4 years, were phenotypically typed, in order to study their population features. Assessment of phenotypes resulted in the identification of three different groups of morphotypes, in the assessment of different virulence on walnut fruitlets, and in the evidence that all isolates were able to grow on Mannitol-glutamate-yeast agar containing 50 ppm of copper sulphate. Moreover, several isolates showed to be highly copper resistant in vitro, up to 500 ppm. Forty-one isolates, selected considering year/origin of plant material and phenotypic features, were molecularly studied by rep-PCR fingerprinting using BOXA1R primer. These strains showed a clear intra-pathovar variation by the presence of eight different haplotypes. Twenty isolates, representative of different BOX profile, were studied by means of variable number of tandem repeats (VNTR) on the locus TR5b. Such analysis highlighted five different sequence types. Eight polymorphic strains on this flanking region isolated in between 2007 and 20 and one isolated in 2010 were subject to multilocus sequence analysis (MLSA) using atpD, dnaK, efP, fyuA, glnA, gyrB, and rpoD housekeeping genes. A diversity level in Italian isolates was highlighted in the same range as in reference strains from a worldwide origin. Finally, the gene cluster copLAB presence was confirmed for all isolates. In this study, the high phenotype and genotype variability inside Xanthomonas arboricola pv. juglandis, was explained by the different origin of the propagation material. Information provided in this study on an Italian Xanthomonas arboricola pv. juglandis collection allows a better understanding of the walnut bacterial blight epidemiology.
Starting Page	1
Ending Page	16
Page Count	16
File Format	PDF
ISSN	09291873
Journal	European Journal of Plant Pathology
Volume Number	145
Issue Number	1
e-ISSN	15738469
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-10-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Genetic diversity Bacterial ecology VNTR MLSA Xanthomonas arboricola pv. juglandis Plant Pathology Plant Sciences Ecology Agriculture Life Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Horticulture Agronomy and Crop Science

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