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• W2743254826 abstract "HomePlant DiseaseVol. 101, No. 12First Report of Alternaria alternata Causing Brown Leaf Spot Disease on Panicle Hydrangea (Hydrangea paniculata) in China PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Alternaria alternata Causing Brown Leaf Spot Disease on Panicle Hydrangea (Hydrangea paniculata) in ChinaZ.-H. Liu, B. Song, Y.-P. Fu, and Y. LiZ.-H. LiuSearch for more papers by this author, B. SongSearch for more papers by this author, Y.-P. Fu†Corresponding authors: Y.-P. Fu, E-mail: E-mail Address: yongpingfu81@126.com; and Y. Li, E-mail: E-mail Address: yuli966@126.comSearch for more papers by this author, and Y. Li†Corresponding authors: Y.-P. Fu, E-mail: E-mail Address: yongpingfu81@126.com; and Y. Li, E-mail: E-mail Address: yuli966@126.comSearch for more papers by this authorAffiliationsAuthors and Affiliations Z.-H. Liu , Department of Plant Pathology, College of Plant Protection, Shenyang Agricultural University, 110866 Shenyang, China; and Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, 130118 Changchun, China B. Song Y.-P. Fu † Y. Li † , Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, 130118 Changchun, China. Published Online:12 Oct 2017https://doi.org/10.1094/PDIS-03-17-0350-PDNAboutSections ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat Panicle hydrangea (Hydrangea paniculata ‘Grandiflora’) is an ornamental flowering plant native to China, Japan, and Russia. In June 2015 and 2016, brown leaf spots were observed on panicle hydrangea in the Agri-Expo Garden of Changchun (125°25′E, 43°48′N), Jilin Province, China. Symptoms initially appeared on the lower and older leaves, and gradually extended to younger leaves. Infected leaves exhibited small circular or subcircular brown spots with dark-brown edges. With time, the necrotic spots enlarged, became irregular, and often coalesced blighting down the leaf. Symptomatic leaf sections 10 mm2 excised from the margin of lesions were surface sterilized in 75% alcohol for 30 s, followed by 1 min in 1.5% NaOCl, raised three times with sterile distilled water, and plated on potato dextrose agar (PDA). Plates were incubated at 25°C with a 12-h photoperiod for 5 days. Colonies from representative single-spore isolates were brownish-olive in color with cottony mycelia and white margins. In order to observe conidia and conidial chains, isolate PHAA01 was cultured on potato carrot agar (PCA) in darkness at 25°C for 10 days (Cong et al. 2016). The fungus formed conidial chains with short branches that typically consisted of one to five conidia. Conidia (n = 120) were light brown to brown, obclavate or ovoid, and measured 12.6 to 42.9 (22.1 ± 5.6) μm long × 6.9 to 14.5 (10.2 ± 1.6) μm wide. Conidia had 3 to 8 transversal and 1 to 4 longitudinal septa. Conidiophores were light brown to brown, straight or slightly curved, and septate. Based on morphology, we identified the fungus as Alternaria alternata (Simmons 2007). For molecular identification, DNA was extracted from mycelia of 10-day-old isolate PHAA01 grown on PDA. The internal transcribed spacer region (ITS) and a partial coding sequence of a histone gene (H3) were amplified and sequenced using ITS4/ITS5 and H3-1a/H3-1b primers, respectively (Glass and Donaldson 1995). The sequences of the ITS (549 bp) and H3 gene (407 bp), deposited in GenBank (accession nos. KY203334 and KY462728), showed 99% similarity with both A. alternata strains KUC5005 (GQ241273) and BJ-DX-AD-HYC-1 (KR866858). We conducted pathogenicity tests on 20 unwounded and 20 wounded leaves attached to healthy H. paniculata plants following the method of Zhou et al. (2014). The 40 leaves were inoculated with 1 × 106 conidia/ml spore suspension, and another 20 leaves (10 wounded and 10 unwounded) with sterile water as control. All the plants were maintained in a greenhouse at 25°C and 90% RH with a 12-h photoperiod. After 7 days, all leaves inoculated with the spore suspension developed brown spots similar to those observed in the garden, while all control leaves remained asymptomatic. The same pathogen was reisolated from the infected leaves and confirmed by ITS and H3 gene analysis. All experiments were repeated three times. A. alternata has been reported to cause leaf spot on citrus (Ni et al. 2015) and on other hosts worldwide. To our knowledge, this is the first of report A. alternata causing brown leaf spot on H. paniculata in China. Because leaf spots can adversely affect the aesthetic value of hydrangea, further investigation and management are required to control this new disease.References:Cong, Y. L., et al. 2016. Plant Dis. 100:2321. https://doi.org/10.1094/PDIS-01-16-0120-PDN Link, ISI, Google ScholarGlass, N. L., and Donaldson, G. C. 1995. Appl. Environ. Microbiol. 61:1323. Crossref, ISI, Google ScholarNi, H. F., et al. 2015. Plant Dis. 99:1864. https://doi.org/10.1094/PDIS-12-14-1341-PDN Link, ISI, Google ScholarSimmons, E. G. 2007. Alternaria: An Identification Manual. CBS Fungal Biodiversity Center, Utrecht, The Netherlands. Google ScholarZhou, L. X., et al. 2014. Plant Dis. 98:697. https://doi.org/10.1094/PDIS-10-13-1086-PDN Link, ISI, Google ScholarDetailsFiguresLiterature CitedRelated Vol. 101, No. 12 December 2017SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 16 Nov 2017Published: 12 Oct 2017First Look: 10 Aug 2017Accepted: 8 Aug 2017 Page: 2147 Information© 2017 The American Phytopathological SocietyCited byFirst report of leaf spots caused by Alternaria alternata on Hydrangea paniculata in Italy11 January 2023 | Journal of Plant Pathology, Vol. 101Alternaria alternata (alternaria leaf spot)CABI Compendium, Vol. CABI Compendium" @default.
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• W2743254826 title "First Report of <i>Alternaria alternata</i> Causing Brown Leaf Spot Disease on Panicle Hydrangea (<i>Hydrangea paniculata</i>) in China" @default.
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