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First Report of Colletotrichum fructicola Causing Apple Bitter Rot in Europe

2019; American Phytopathological Society; Volume: 103; Issue: 7 Linguagem: Inglês

10.1094/pdis-11-18-1915-pdn

1943-7692

Patrice Nodet, Morgane Chalopin, Xavier Crété, Riccardo Baroncelli, Gaëtan Le Floch,

Mycorrhizal Fungi and Plant Interactions

HomePlant DiseaseVol. 103, No. 7First Report of Colletotrichum fructicola Causing Apple Bitter Rot in Europe PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Colletotrichum fructicola Causing Apple Bitter Rot in EuropeP. Nodet, M. Chalopin, X. Crété, R. Baroncelli, and G. Le FlochP. Nodet†Corresponding author: P. Nodet; E-mail Address: [email protected]http://orcid.org/0000-0003-3712-9783Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IBSAM, ESIAB, Université de Brest, EA 3882, Technopôle Brest-Iroise, 29280 Plouzané, France, M. ChalopinLaboratoire Universitaire de Biodiversité et Ecologie Microbienne, IBSAM, ESIAB, Université de Brest, EA 3882, Technopôle Brest-Iroise, 29280 Plouzané, France, X. CrétéSUDEXPE - Site de Marsillargues, Mas de Carrière, 34590 Marsillargues, France, R. BaroncelliInstituto Hispano-Luso de Investigaciones Agrarias (CIALE), University of Salamanca, 37185 Villamayor (Salamanca), Spain, and G. Le Flochhttp://orcid.org/0000-0001-7413-8852Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IBSAM, ESIAB, Université de Brest, EA 3882, Technopôle Brest-Iroise, 29280 Plouzané, FranceAffiliationsAuthors and Affiliations P. Nodet1 † M. Chalopin1 X. Crété2 R. Baroncelli3 G. Le Floch1 1Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IBSAM, ESIAB, Université de Brest, EA 3882, Technopôle Brest-Iroise, 29280 Plouzané, France 2SUDEXPE - Site de Marsillargues, Mas de Carrière, 34590 Marsillargues, France 3Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), University of Salamanca, 37185 Villamayor (Salamanca), Spain Published Online:11 Mar 2019https://doi.org/10.1094/PDIS-11-18-1915-PDNAboutSectionsSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat Bitter rot is one of the prevalent diseases of apple (Malus pumila Mill.) worldwide. The disease affects the fruit preharvest in orchards and/or postharvest in storage, resulting in considerable economic losses. Until recently the reported causal agents in Europe belong to the Colletotrichum acutatum species complex (Baroncelli et al. 2014; Nodet et al. 2016); however, species belonging to C. gloeosporioides species complex were reported in the United States (Munir et al. 2016), South America (Velho et al. 2018), Korea (Park et al. 2018), and recently in Belgium (Grammen et al. 2019). In September 2017, bitter rot symptoms were observed on apple fruit (cultivars Joya Cripps Red, Granny Smith, and Pink Lady) in four orchards in the region of Occitanie in France. The rot began as circular brown spots, 1 to 2 mm in diameter, which enlarged rapidly. Sixteen isolates were obtained from symptomatic apples by culturing pieces of necrotic tissue on potato dextrose agar. Cultures showed light-gray, cottony mycelium that became darker with age, with the reverse color being brownish and becoming black with age. Conidia were produced in small orange masses and were mainly cylindrical, with rounded ends. For all isolates, the production of perithecia was observed in culture, and asci and ascospores were observed under the microscope. The width and length of 50 conidia were examined and ranged from 3.1 to 4 µm (average 3.5 µm) and from 8 to 13 µm (average 10.5 µm), respectively. Based on these morphological characteristics, those isolates correspond to teleomorph of species belonging to C. gloeosporioides species complex (Weir et al. 2012). Total genomic DNA was extracted from the 16 isolates, and the internal transcribed spacer region of rDNA was amplified using the universal primers ITS4 and ITS5 and then sequenced. For all isolates, the resulting sequences were 100% identical to C. fructicola sequences obtained by a BLAST search in GenBank. Three other loci (partial GAPDH, TUB2, and ApMat genes) were amplified and sequenced to further characterize two isolates (UBOCC-A-118064 and UBOCC-A-118065; GenBank accession nos. MK114103 to MK114110, respectively). Multilocus phylogenetic analysis carried out with the obtained and reference sequences (Da Lio et al. 2018) revealed that the isolates clustered within C. fructicola, as suggested by the BLAST results; this is also consistent with their initial identification as C. gloeosporioides. To confirm Koch's postulates, for the two characterized isolates, 10 'Golden Delicious' apples were surface sterilized and then wound inoculated with 20 μl of a conidial suspension (105 conidia/ml). After 10 days of incubation at 20°C, symptoms identical to those initially observed developed around the inoculation point, whereas controls inoculated with water remained symptomless. Fungal thalli reisolated from the lesions were morphologically similar to the original isolate. To our knowledge, this is the first report in Europe of C. fructicola causing bitter rot on apple. According to Munir et al. (2016), C. fructicola was reported to be more aggressive than species belonging to the C. acutatum species complex such as C. fioriniae previously identified in France (Nodet et al. 2016); moreover, this species is associated with Glomerella leaf spot, an emerging leaf disease never described in Europe (Velho et al. 2018). All those points encourage the development of species-specific management strategies for this pathogen in European countries.References:Baroncelli, R., et al. 2014. Plant Dis. 98:1000. https://doi.org/10.1094/PDIS-11-13-1177-PDN Link, ISI, Google ScholarDa Lio, D., et al. 2018. Sci. Rep. 8:10765. https://doi.org/10.1038/s41598-018-29027-z Crossref, ISI, Google ScholarGrammen, A., et al. 2019. Eur. J. Plant Pathol. 153:47. Crossref, ISI, Google ScholarMunir, M., et al. 2016. Plant Dis. 100:2194. https://doi.org/10.1094/PDIS-10-15-1144-RE Link, ISI, Google ScholarNodet, P., et al. 2016. Plant Dis. 100:1497. https://doi.org/10.1094/PDIS-11-15-1353-PDN Link, Google ScholarPark, M. S., et al. 2018. Mycobiology 46:154. https://doi.org/10.1080/12298093.2018.1478220 Crossref, Google ScholarVelho, A. C., et al. 2018. Mycology 9:145. https://doi.org/10.1080/21501203.2018.1464525 Crossref, Google ScholarWeir, B. S., et al. 2012. Stud. Mycol. 73:115. https://doi.org/10.3114/sim0011 Crossref, ISI, Google ScholarThe author(s) declare no conflict of interest.DetailsFiguresLiterature CitedRelated Vol. 103, No. 7 July 2019SubscribeISSN:0191-2917e-ISSN:1943-7692 DownloadCaptionApple cultivar Joya Cripps Red lesions caused by Colletotrichum fructicola (Nodet et al.). Photo credit: P. Nodet. Symptoms of Lotus powdery mildew caused by Erysiphe takamatsui (Zhou et al.). Photo credit: C. Liang. Symptoms of tar spot (Phyllachora maydis) on maize leaves (Dalla Lana et al.). Photo credit: F. Dalla Lana. Metrics Article History Issue Date: 20 Jun 2019Published: 11 Mar 2019First Look: 8 Jan 2019Accepted: 5 Jan 2019 Page: 1767 InformationThis article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. 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