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• W2952260050 abstract "HomePlant DiseaseVol. 103, No. 10First Report of Powdery Mildew Caused by Podosphaera xanthii on Solena amplexicaulis in China PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of Powdery Mildew Caused by Podosphaera xanthii on Solena amplexicaulis in ChinaLili Tang, Chao Fan, Jinming Kou, Wenhui Li, and Kai PanLili Tanghttp://orcid.org/0000-0003-3134-8432College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, ChinaKey Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, ChinaSearch for more papers by this author, Chao Fanhttp://orcid.org/0000-0001-6307-7951College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, ChinaKey Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, ChinaInstitute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, ChinaSearch for more papers by this author, Jinming KouCollege of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, ChinaKey Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, ChinaSearch for more papers by this author, Wenhui Li†Corresponding authors: Wenhui Li; E-mail Address: liwenhuizi@163.com and Kai Pan; E-mail Address: mugonglin@163.comCollege of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, ChinaKey Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, ChinaSearch for more papers by this author, and Kai Pan†Corresponding authors: Wenhui Li; E-mail Address: liwenhuizi@163.com and Kai Pan; E-mail Address: mugonglin@163.comCollege of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, ChinaKey Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, ChinaSearch for more papers by this authorAffiliationsAuthors and Affiliations Lili Tang1 2 Chao Fan1 2 3 Jinming Kou1 2 Wenhui Li1 2 † Kai Pan1 2 † 1College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China 2Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China 3Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China Published Online:7 Aug 2019https://doi.org/10.1094/PDIS-04-19-0784-PDNAboutSectionsSupplemental ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat Solena amplexicaulis (Lam.) Gandhi is an important medicinal plant of the family Cucurbitaceae. The plant has been used in traditional herbal medicine because it contains numerous anti-inflammatory, antinociceptive, and antidiabetic compounds (State Administration of Traditional Chinese Medicine 1999). It is identified as a common raw material in traditional Chinese medicine and grows wild in crop fields in tropical and subtropical regions in China. In January 2018, powdery mildew on the leaves of S. amplexicaulis plants was observed around a greenhouse in Hainan Experimental Station of Northeast Agricultural University (18°19′34″ N, 109°48′28″ E), Sanya, China. There were about 120 S. amplexicaulis plants in an area of 150 m2. Powdery mildew colonies first appeared as white spots on the upper surface of the leaves and stems of the plants. Later, white hyphae covered the leaves and the petiole. Later in the season, entire leaves yellowed and senescence occurred. Isolated conidia from infected samples were ellipsoid-ovoid to barrel-shaped, with distinct fibrosin bodies visible in their cytoplasm, and measured 27 to 36 × 18 to 24 μm (n = 30) with a length/width ratio from 1.5 to 2.0. Conidiophores were unbranched, straight, 80 to 260 × 7 to 15 µm in size, and produced three to five immature conidia in chains with a crenate outline. Foot cells of conidiophores were cylindrical and 35 to 72 μm long, with slight constrictions at basal septa, and followed by one to three short cells. Fungal hyphae were septate, branched, and flexuous to straight and up to 7 µm wide with indistinct to slightly nipple-shaped appressoria. These structures are typical of the genus Podosphaera. Partial sequences of the 18S small subunit ribosomal (ITS1), 5.8S ribosomal (ITS2), and large subunit ribosomal RNA gene were amplified from conidia collected from infected leaves using universal primers ITS1/ITS4 (White et al. 1990), and purified PCR products were sequenced. Sequences were deposited in GenBank under accession numbers MK809309 and MK809310. BLASTn analysis of the ITS sequence (569 bp) revealed ≥99% sequence identity with respective sequences of Podosphaera xanthii isolates from Lagenaria siceraria (MG719984.1), Citrullus lanatus (KX369541.1), and Abelmoschus esculentus (MG754404). Consequently, on the basis of morphological and molecular characteristics the fungal species causing disease on S. amplexicaulis was tentatively identified as P. xanthii (Braun and Cook 2012). A pathogenicity test was performed by dusting conidia of an infected leaf onto young leaves of five healthy S. amplexicaulis plants, with noninoculated plants as controls. Powdery mildew symptoms were observed on inoculated leaves after 6 days at 19 to 27°C (night/day) and 75% relative humidity, whereas the control plants remained asymptomatic. The morphological features of the powdery mildew on the inoculated leaf discs were similar to the original fungal isolate. Powdery mildew, caused by P. xanthii, is one of the major diseases of the Cucurbitaceae affecting a wide range of host species worldwide, including in China (Farr and Rossman 2017). To the best of our knowledge, this is the first report of powdery mildew caused by P. xanthii on S. amplexicaulis in China. The leaves, roots, and fruits of S. amplexicaulis are all important in traditional herbal medicine. Powdery mildew would be a serious threat to production of S. amplexicaulis in this region.The author(s) declare no conflict of interest.References:Braun, U., and Cook, R. T. A. 2012. Taxonomic Manual of the Erysiphales (Powdery Mildews), CBS Biodiversity Series No. 11. CBS, Utrecht, the Netherlands. Google ScholarFarr, D. F., and Rossman, A. Y. 2017. Fungal Databases, Syst. Mycol. Microbiol. Lab., ARS, USDA. https://nt.ars-grin.gov/fungaldatabases/. Google ScholarState Administration of Traditional Chinese Medicine. 1999. Chinese Materia Medica. Shanghai Science and Technology Press, Shanghai, China. 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 ScholarThe author(s) declare no conflict of interest.L. Tang and C. Fan contributed equally to this research.Funding: This research was supported by the Open Project of Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture (2016YFD0201004), a subproject of the National Key Research and Development Program of China and Economic Crops (Vegetable) in Heilongjiang Province Modern Agriculture Industry Technology Innovation System (HNWJZT201701), Heilongjiang University Innovation Talent Project (UNPYSCT-2017004), Post-doctoral Project in Heilongjiang Province (LBH-Z1019), and Northeast Agricultural University Youth Talent Project (16QC05).DetailsFiguresLiterature CitedRelated Vol. 103, No. 10 October 2019SubscribeISSN:0191-2917e-ISSN:1943-7692 DownloadCaptionBell pepper cv. Bomby infected with zucchini yellow mosaic virus along with cucumber mosaic virus, pepper mild mottle virus, and tobacco mosaic virus (Verma et al.). Photo credit: S. Tripathi. Severe stunting, leaf chlorosis, and horizontal head growth of sunflower infected with Plasmopara halstedii, causal agent of downy mildew (Humann et al.). Photo credit: S. Markell. Metrics Article History Issue Date: 3 Oct 2019Published: 7 Aug 2019First Look: 11 Jun 2019Accepted: 7 Jun 2019 Pages: 2671-2671 InformationThis article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 2019.FundingOpen Project of Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of AgricultureGrant/Award Number: 2016YFD0201004National Key Research and Development Program of China and Economic Crops (Vegetable) in Heilongjiang Province Modern Agriculture Industry Technology Innovation SystemGrant/Award Number: HNWJZT201701Heilongjiang University Innovation Talent ProjectGrant/Award Number: UNPYSCT-2017004Post-doctoral Project in Heilongjiang ProvinceGrant/Award Number: LBH-Z1019Northeast Agricultural University Youth Talent ProjectGrant/Award Number: 16QC05KeywordsPodosphaera xanthiiSolena amplexicaulisChinaThe author(s) declare no conflict of interest.Cited byPodosphaera xanthii (powdery mildew of cucurbits)CABI Compendium, Vol. CABI Compendium" @default.
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