First Report of Bacterial Spot Caused by Xanthomonas arboricola pv. pruni on Apricot in Hungary
2017; American Phytopathological Society; Volume: 101; Issue: 6 Linguagem: Inglês
10.1094/pdis-11-16-1582-pdn
ISSN1943-7692
AutoresIldikó Schwarczinger, Zoltán Bozsó, Ágnes Szatmári, S. Süle, Z. Szabó, Lóránt Király,
Tópico(s)Plant-Microbe Interactions and Immunity
ResumoHomePlant DiseaseVol. 101, No. 6First Report of Bacterial Spot Caused by Xanthomonas arboricola pv. pruni on Apricot in Hungary PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Bacterial Spot Caused by Xanthomonas arboricola pv. pruni on Apricot in HungaryI. Schwarczinger, Z. Bozsó, Á. Szatmári, S. Süle, Z. Szabó, and L. KirályI. SchwarczingerSearch for more papers by this author, Z. BozsóSearch for more papers by this author, Á. SzatmáriSearch for more papers by this author, S. SüleSearch for more papers by this author, Z. SzabóSearch for more papers by this author, and L. KirálySearch for more papers by this authorAffiliationsAuthors and Affiliations I. Schwarczinger Z. Bozsó Á. Szatmári S. Süle , Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, H-1022 Budapest, Hungary Z. Szabó , Balaton Fruit Ltd., H-8171 Balatonvilágos, Hungary L. Király , Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, H-1022 Budapest, Hungary Published Online:4 Apr 2017https://doi.org/10.1094/PDIS-11-16-1582-PDNAboutSectionsSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat In June 2016, red-purple necrotic lesions, each 1 to 5 mm in diameter and surrounded by a chlorotic halo on leaves and water-soaked or dark brown sunken lesions on fruits of apricot (Prunus armeniaca L. cv. Bergecot and Toyesi) trees were observed in a 5 ha commercial orchard in Fejér County, Hungary. Disease incidence ranged from low (10%) on cv. Toyesi to more than 90% on cv. Bergecot. As the disease progressed, the necrotic areas on leaves dropped out, leaving a “shot-hole” appearance. Isolation was carried out on modified Tween-80 semiselective medium (Schaad et al. 2001) from 40 diseased leaves and fruits sampled from 20 different trees. After incubation at 28°C for 3 to 5 days, yellow, mucoid colonies appeared and the hydrolysis of Tween 80 could be observed as a white zone around the colonies. Three isolates were selected that induced a hypersensitive response in tobacco (Nicotiana tabacum cv. Xanthi) plants 48 h after inoculation with a 108 CFU/ml bacterial suspension in water. All strains were gram-negative rods, oxidase negative, and strictly aerobic, and showed typical biochemical characteristics of the Xanthomonas genus (Schaad et al. 2001). In order to confirm identity of isolates as X. arboricola pv. pruni (Xap), specific PCR assays, sequencing, and pathogenicity tests were conducted. Duplex-PCR with Xap-specific primers (XarbQ-F/XarbQ-R and XapY17-F/XapY17-R) (Pothier et al. 2011) gave positive results. Furthermore, double-strand sequencing of the gyrase B (gyrB) (Parkinson et al. 2007) and ftsX genes (primers XapY17-F/XapY17-R for ftsX) was conducted. Sequences of gyrB (GenBank KX950802) and ftsX (KY039173) had 100% identity with reference genomic sequences of the Xap strains: CFBP3894 (NZ_LOMI01000009, LOMI01000020) and IVIA 2626.1 (NZ_LJGN01000040, LJGN01000033). Pathogenicity was confirmed by artificial inoculation of detached leaves of 1-year-old apricot trees (two leaves/tree sampled from five trees) (Randhawa and Civerolo 1985). Isolates were infiltrated (108 CFU/ml) by a syringe (0.5 ml/leaf). Sterile distilled water was used as negative control. Leaves were incubated on 0.5% water agar at 25°C and 16 h photoperiod with fluorescent light. All leaves inoculated with the isolates developed confluent water-soaking spots 3 to 4 days after inoculation. These became dark brown, necrotic spots, sometimes surrounded by grayish white or purple margins. No symptoms were observed on control leaves. The bacterium was reisolated from leaf spots and identity of the isolates was confirmed by PCR. To our knowledge, this is the first confirmed report on the occurrence of this pathogen on apricot in Hungary. Xap is the causal agent of bacterial spot of stone fruits, one of the most important diseases of Prunus species included in the EPPO A2 list of pests recommended for regulation for European Union member countries. Apricot is an economically important crop in Hungary, with a production of ca. 5,000 ha, and the pathogen could have a significant impact on apricot production in the country.References:Parkinson, N., et al. 2007. Int. J. Syst. Evol. Microbiol. 57:2881. https://doi.org/10.1099/ijs.0.65220-0 Crossref, ISI, Google ScholarPothier, J. F., et al. 2011. J. Microbiol. Methods 86:16. https://doi.org/10.1016/j.mimet.2011.03.019 Crossref, ISI, Google ScholarRandhawa, P. S., and Civerolo, E. L. 1985. Phytopathology 75:1060. https://doi.org/10.1094/Phyto-75-1060 Crossref, ISI, Google ScholarN. W. Schaad, et al., eds. 2001. Laboratory Guide for Identification of Plant Pathogenic Bacteria, 3rd Ed. APS, St. Paul, MN. Google ScholarDetailsFiguresLiterature CitedRelated Vol. 101, No. 6 June 2017SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 17 May 2017Published: 4 Apr 2017First Look: 20 Feb 2017Accepted: 11 Feb 2017 Pages: 1031-1031 Information© 2017 The American Phytopathological SocietyCited byCharacterization of Xanthomonas arboricola pv. pruni from Prunus spp. orchards in Western Balkans22 October 2022 | Plant Pathology, Vol. 72, No. 2Xanthomonas arboricola pv. pruni (bacterial canker of stone fruit)CABI Compendium, Vol. CABI CompendiumAetiology of peach and sweet cherry leaf spot and twig canker in MontenegroActa Horticulturae, No. 1322First Report of Black Spot Disease Caused by Xanthomonas arboricola pv. pruni on Plumcot in South KoreaWalftor Dumin, Mi-Jeong Park, Jong-Han Park, Chang-Yeol Yang, and Chang-Gi Back13 January 2021 | Plant Disease, Vol. 105, No. 3First Report of Bacterial Spot Caused by Xanthomonas arboricola pv. pruni on Almond in HungaryJudit Kolozsváriné Nagy, Zoltán Bozsó, Ágnes Szatmári, Sándor Süle, Zoltán Szabó, Lóránt Király, and Ildikó Schwarczinger19 November 2019 | Plant Disease, Vol. 104, No. 2Characterization of the bacteria associated with alder angular leaf spot in Iran30 August 2019 | Australasian Plant Pathology, Vol. 48, No. 6First Report of Bacterial Leaf Spot Caused by the Quarantine Pathogen Xanthomonas arboricola pv. pruni on Peach in HungaryI. 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