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• W2803161818 abstract "HomePlant DiseaseVol. 102, No. 11First Report of Powdery Mildew Caused by Podosphaera xanthii on Lagenaria siceraria in China PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Powdery Mildew Caused by Podosphaera xanthii on Lagenaria siceraria in ChinaH. Cui, C. Wu, Q. Zhu, C. Fan, P. Gao, and F. LuanH. Cuihttp://orcid.org/0000-0002-7151-7168Search for more papers by this author, C. WuSearch for more papers by this author, Q. ZhuSearch for more papers by this author, C. FanSearch for more papers by this author, P. Gao†Corresponding authors: P. Gao; E-mail: E-mail Address: gaopeng_neau@163.com and F. Luan; E-mail: E-mail Address: luanfeishi@neau.edu.cnSearch for more papers by this author, and F. Luan†Corresponding authors: P. Gao; E-mail: E-mail Address: gaopeng_neau@163.com and F. Luan; E-mail: E-mail Address: luanfeishi@neau.edu.cnSearch for more papers by this authorAffiliationsAuthors and Affiliations H. Cui C. Wu Q. Zhu , College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China C. Fan , College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China, and Hainan Base of Heilongjiang Agriculture Academy, Sanya, Hainan, 572000, China P. Gao † F. Luan † , College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China. Published Online:4 Sep 2018https://doi.org/10.1094/PDIS-12-17-1993-PDNAboutSectionsSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat Lagenaria siceraria, belonging to the Cucurbitaceae family, is one of the main vegetable crops in China. It also has economic value as artware. In November 2017, powdery mildew infection was observed on L. siceraria ‘B1-1’ in a greenhouse at Northeast Agricultural University (45°44′20.61″ N, 126°43′34.46″ E), Harbin, China. Disease incidence was 85% from a sampled population of 100 plants. Disease severity on individual plants ranged between 10 and 30%. At the initial stages of infection, circular to irregular white powdery colonies formed on both sides of the leaves. In later stages, entire leaves were covered with white mycelium, followed by leaf yellowing and senescence. Fungal hyphae were septate, branched, flexuous to straight, up to 7 μm wide, with indistinct to slightly nipple-shaped appressoria. Conidiophores were unbranched, straight, 92 to 264 × 9 to 15 μm in size. Foot cells of the conidiophores were cylindrical, 40 to 78 μm long, with slight constriction at basal septa, and followed by one to three short cells. Conidia were hyaline, formed in chains of two to eight cells with distinct fibrosin bodies visible in their cytoplasm, ellipsoid-ovoid to barrel-shaped, about 30 to 45 × 14 to 20 μm in size, with a length-to-width ratio ranging mostly from 1.5 to 2.0. Chasmothecia were absent in the infected samples. Fungal structures were similar to other observations (Dorneles et al. 2018). The rDNA internal transcribed spacer (ITS) region was amplified from pools of conidia on infected leaves by using primers ITS1/ITS4 (White et al. 1990) and directly sequenced. BLASTn analysis of the 568-bp (MG706136) amplicon revealed 100% sequence identity with respective rDNA sequences of Podosphaera xanthii isolates from Citrullus lanatus (KX369541.1), Jatropha gossypifolia (KM260741.1), and Momordica charantia (AB774158.1). Based on the morphological characteristics and ITS sequences, the fungal species was identified as P. xanthii (Braun 1987). Pathogenicity of the powdery mildew fungi was tested by dusting conidia from infected bottle gourd leaves onto three asymptomatic plants (L. siceraria ‘B1-1’). Another set of three noninoculated plants was used as a control. Inoculated leaves showed powdery mildew symptoms after 5 days at 20°C and 80% relative humidity in a greenhouse. The fungal morphology on inoculated leaves was identical to that observed on initially diseased leaves. Powdery mildew, caused by P. xanthii, is a major foliar disease affecting crops in the Cucurbitaceae family worldwide. This disease was previously reported on L. siceraria from India (Nayak and Babu 2017) and Brazil (Dorneles et al. 2018). To our knowledge, this is the first report of P. xanthii on L. siceraria in China.References:Braun, U. 1987. A Monograph of the Erysiphales (Powdery Mildews). J. Cramer, Berlin, German Democratic Republic. Google ScholarDorneles, K. R., et al. 2018. Plant Dis. 102:823. Google ScholarNayak, A. K., and Babu, B. K. 2017. J. Plant Pathol. 99:289. 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 ScholarFunding: Funding was provided by the National Nature Science Foundation of China (No. 31672177), the College Youth Innovation Talent Training Project of Heilongjiang Province (No. UNPYSCT-2016136), the “Young Talents” Project of Northeast Agricultural University (No. 14QC09), and the “Academic Backbone” Project of Northeast Agricultural University (No. 16XG06).DetailsFiguresLiterature CitedRelated Vol. 102, No. 11 November 2018SubscribeISSN:0191-2917e-ISSN:1943-7692 Metrics Article History Issue Date: 25 Oct 2018Published: 4 Sep 2018First Look: 14 May 2018Accepted: 9 May 2018 Pages: 2374-2374 Information© 2018 The American Phytopathological SocietyFundingNational Nature Science Foundation of ChinaGrant/Award Number: 31672177College Youth Innovation Talent Training Project of Heilongjiang ProvinceGrant/Award Number: UNPYSCT-2016136“Young Talents” Project of Northeast Agricultural UniversityGrant/Award Number: 14QC09“Academic Backbone” Project of Northeast Agricultural UniversityGrant/Award Number: 16XG06Cited byPodosphaera xanthii (powdery mildew of cucurbits)CABI Compendium, Vol. CABI CompendiumFirst Report of Powdery Mildew Caused by Podosphaera xanthii on Hulless Cucurbita pepo of Western District in ChinaQ. L. Liang, L. X. Wei, B. L. Xu, L. L. Liu, and A. Calderón-Urrea17 December 2020 | Plant Disease, Vol. 105, No. 2" @default.
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• W2803161818 title "First Report of Powdery Mildew Caused by <i>Podosphaera xanthii</i> on <i>Lagenaria siceraria</i> in China" @default.
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