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• W3048778628 abstract "HomePlant DiseaseVol. 105, No. 1First Report of Anthracnose Caused by Colletotrichum karstii on Fatsia japonica in Sichuan, China PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Anthracnose Caused by Colletotrichum karstii on Fatsia japonica in Sichuan, ChinaXiu-lan Xu, Qian-gang Xiao, Chun-lin Yang, and Ying-gao LiuXiu-lan Xuhttp://orcid.org/0000-0002-6832-5421Forestry Research Institute, Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, 611130, ChinaNational Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, ChinaSichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, ChinaSearch for more papers by this author, Qian-gang XiaoForestry Research Institute, Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, 611130, ChinaSearch for more papers by this author, Chun-lin Yang†Corresponding author: C. L. Yang; E-mail Address: yangcl0121@163.comhttp://orcid.org/0000-0002-3854-8835National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, ChinaSichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, ChinaSearch for more papers by this author, and Ying-gao LiuNational Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, ChinaSichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, ChinaSearch for more papers by this author AffiliationsAuthors and Affiliations Xiu-lan Xu1 2 3 Qian-gang Xiao1 Chun-lin Yang2 3 † Ying-gao Liu2 3 1Forestry Research Institute, Chengdu Academy of Agricultural and Forestry Sciences, Chengdu, 611130, China 2National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, China 3Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River, Sichuan Agricultural University, Chengdu, Sichuan 611130, China Published Online:17 Nov 2020https://doi.org/10.1094/PDIS-05-20-0990-PDNAboutSectionsView articlePDFPDF PlusSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat View articleFatsia japonica (Thunb.) Decne. & Planch. (Araliaceae), an evergreen shrub, is widely planted in urban settings at the south of the Yangtze river in China. Leaf-spot symptoms were observed on 120/200 F. japonica plants at Sichuan Agricultural University. Initially, yellowish spots appeared on the leaves and became white with age. The spots continued to expand with time, developing irregular margins and eventually encompassing the entire leaf. Eventually, diseased leaves became curled and died. Four single-spore isolates were obtained following the method of Chomnunti et al. (2014). The colonies developed on potato dextrose agar (PDA) were white to gray with fluffy aerial hyphae. The base of the mycelium was yellow. On the host conidiomata circular to elliptical, measured 108 to 335 × 107 to 250 μm (n = 20). Conidiophores were bell-shaped to cylindrical, hyaline, usually one-celled, unbranched, 9.7 to 23.6 (to 28) × 3.5 to 5.5 μm (x̅ = 16.5 × 4.6 μm, n = 15). Conidia measured 12.5 to 17.6 × 5.1 to 7.9 μm (x̅ = 14.9 × 6.7 μm, n = 25), were hyaline, straight, unicellular, cylindrical. Appressoria formed abundantly on slides, measured 12.4 to 25.4 (to 29.6) × 6.3 to 18.4 μm (x̅ = 18.9 × 13.4 μm, n = 30), were dark brown to black, elliptical to irregular. Ascomata on PDA were brown to dark brown, global, covered by aerial mycelium, and setae were absent. Ascospores measured 13.2 to 19.1 × 4.0 to 6.1 μm (x̅ = 16.0 × 4.8 μm, n = 20), and one-celled, hyaline, slightly curved. The representative isolate SICAUCC 20-0010 was used for genomic DNA extraction following the instructions of the Plant Genomic DNA extraction kit (Tiangen, China), and the internal transcribed spacer (ITS, MT393946), glyceraldehyde-3-phosphate dehydrogenase (GAPDH, MT425977), beta-tubulin (TUB2, MT425978), chitin synthase (CHS-1, MT425976), and actin (ACT, MT425975) genes were amplified with ITS5/ITS4 (White et al. 1990), GDF/GDR (Guerber et al. 2003), T1/Bt2b (O’Donnell and Cigelnik 1997), CHS-79F/CHS-354R, and ACT-512F/ACT-783R (Carbone and Kohn 1999) primers, respectively. ITS, GAPDH, CHS-1, and ACT BLAST showed 100% homology with sequences of Colletotrichum karstii (Damm et al. 2012; Xu et al. 2019; Yang et al. 2011), namely, JQ005186 (555/555 bp), MK359214 (238/238 bp), JQ005360 (274/274 bp), and MK359211 (269/269 bp), respectively. TUB2 showed 99.60% homology with sequence JQ005620 (495/497 bp). The fungus was identified as C. karstii based on morphology and a multigene phylogeny. Four leaves from each of three healthy F. japonica plants were sprayed with a conidial suspension (1 × 105 conidia/ml) of the isolate SICAUCC 20-0010. Two additional mock-inoculated control plants were sprayed with sterile distilled water. Plants were incubated in a greenhouse at 26°C and 90% relative humidity with a 12-h photoperiod. The leaves developed chlorotic lesions 6 days postinoculation, and by 22 days postinoculation the remaining signs and symptoms had developed. No symptoms developed on the mock-inoculated controls. The fungus isolated from inoculated plants was morphologically identical to the original pathogen, fulfilling Koch’s postulates. Anthracnose on F. japonica caused by C. fructicola and C. gloeosporioides has been reported in China (Shi et al. 2017; Wang 2007). However, this is the first report of anthracnose caused by C. karstii on F. japonica. Field observations indicated that this disease mainly occurs on old and weakened leaves. This disease affects the aesthetic appearance of the plants, reducing their appeal as landscape plants.The author(s) declare no conflict of interest.References:Carbone, I., and Kohn, L. M. 1999. Mycologia 91:553. https://doi.org/10.1080/00275514.1999.12061051 Crossref, ISI, Google ScholarChomnunti, P., et al. 2014. Fungal Divers. 66:1. https://doi.org/10.1007/s13225-014-0278-5 Crossref, ISI, Google ScholarDamm, U., et al. 2012. Stud. Mycol. 73:1. https://doi.org/10.3114/sim0002 Crossref, ISI, Google ScholarGuerber, J. C., et al. 2003. Mycologia 95:872. https://doi.org/10.1080/15572536.2004.11833047 Crossref, ISI, Google ScholarO’Donnell, K., and Cigelnik, E. 1997. Mol. Phylogenet. Evol. 7:103. https://doi.org/10.1006/mpev.1996.0376 Google ScholarShi, N. N., et al. 2017. Plant Dis. 101:1552. https://doi.org/10.1094/PDIS-12-16-1720-PDN Link, Google ScholarWang, G. L. 2007. J. Zhengjiang For. Sci. Technol. 27:64. Google ScholarWhite, T. J., et al. 1990. Page 315 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, CA. Crossref, Google ScholarXu, X. L., et al. 2019. Plant Dis. 103:2127. https://doi.org/10.1094/PDIS-01-19-0033-PDN Link, Google ScholarYang, Y. L., et al. 2011. Cryptogam., Mycol. 32:229. https://doi.org/10.7872/crym.v32.iss3.2011.229 Crossref, ISI, Google ScholarThe author(s) declare no conflict of interest.Funding: The research was supported by the Special Scientific Research Fund of Chengdu Academy for Agricultural and Forestry Sciences from the Municipal Finance Bureau (510100-201700290-2017-00363).DetailsFiguresLiterature CitedRelated Vol. 105, No. 1 January 2021SubscribeISSN:0191-2917e-ISSN:1943-7692 DownloadCaptionTypical symptoms of star anise spot disease caused by Alternaria tenuissima (J.-L. Lai et al.). Photo credit: J.-L. Lai. Water drops rolling over a strawberry leaf blade with a sporulating lesion of powdery mildew (B. Asalf et al.). Photo credit: B. Asalf. Metrics Downloaded 525 times Article History Issue Date: 8 Jan 2021Published: 17 Nov 2020First Look: 11 Aug 2020Accepted: 7 Aug 2020 Page: 216 Information© 2021 The American Phytopathological SocietyFundingSpecial Scientific Research Fund of Chengdu Academy for Agricultural and Forestry Sciences from the Municipal Finance BureauGrant/Award Number: 510100-201700290-2017-00363KeywordsanthracnoseColletotrichum karstiiFatsia japonicaChinaThe author(s) declare no conflict of interest.Cited ByColletotrichum species and complexes: geographic distribution, host range and conservation status29 September 2021 | Fungal Diversity, Vol. 103" @default.
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