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Cercospora Solani-Betacei Fungal Planet Description Sheets 331

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Cercospora Solani-Betacei Fungal Planet Description Sheets 331 330 Persoonia – Volume 41, 2018 Cercospora solani-betacei Fungal Planet description sheets 331 Fungal Planet 826 – 13 December 2018 Cercospora solani-betacei B.W. Ferreira & R.W. Barreto, sp. nov. Etymology. Referring to the host, Solanum betaceum, from which it was Notes — A Cercospora sp. has been reported on Cyphoman­ described. dra betacea (= S. betaceum) in Malawi (Peregrine & Siddiqi Classification — Mycosphaerellaceae, Capnodiales, Dothi­ 1972) and Zimbabwe (Whiteside 1966). Other records of Cerco­ deomycetes. spora spp. on members of Solanum spp. are: Cerco spora apii, C. canescens, C. cyperacearum, C. lanugiflori, C. physalidis, Lesion on living leaves, starting as small necrotic dots, becom- C. puyana, C. solanacea, C. solani, C. solanicola, C. solanigena ing sub-circular, to irregular, 5–15 mm diam, brown, with dark (Farr & Rossman 2018). The morphology of the Cercospora brown margins, coalescing and leading to extensive blight. on tree tomato was similar to that of species belonging to the Internal mycelium indistinct. Stromata reduced to few angular C. apii complex (Groenewald et al. 2013). A BLASTn search on cells, 12–25 × 35–55 μm. Conidiophores predominantly hypo- GenBank indicated a considerable similarity of C. solani­betacei phyllous, rarely epiphyllous, in fascicles of 5–22 conidiophores, to other species belonging to Cercospora. A concatenated sub-cylindrical, geniculate, 100–172 × 4–5 μm, 3–7-septate, phylogenetic tree was constructed with ITS, cmdA and actA unbranched, pale olivaceous brown, smooth. Conidiogenous and, the combined result clearly supported S. betaceum as a cells terminal, subcylindrical, sympodial, sub-hyaline, 15–65 distinct species. × 3–5 μm. Conidiogenous loci conspicuous, 2–3 μm diam, Koch’s postulates were performed and the pathogenicity of the strongly thickened, darkened. Conidia obclavate to subcylindri- fungus to S. betaceum was demonstrated. cal, straight to slightly curved, 47–130 × 3–5 μm, apex rounded to subacute, base truncate, 3–12-septate, guttulate, hyaline, smooth. Culture characteristics — Slow-growing (45 mm in PDA and 35 mm in PCA, after 15 d) at 25 °C. Colony sub-umbonate, edge entire, aerial mycelium dense and felty, white; in PDA radially sulcate. Reverse rosy buff with concentric haloes olivaceous. Sporulation absent. Typus. BRAZIL, Minas Gerais, Antônio Carlos, Dr. Sá Fortes, on living leaves of Solanum betaceum (tree tomato), 10 June 2017, B.W. Ferreira (holotype VIC 44319, ex-type culture COAD 2293, ITS, LSU, cmdA and actA 1 Cercospora solani CCTU 1043 sequences GenBank MH223464, MH700245, MH428037 and MH445457, Cercospora solani CCTU 1050 MycoBank MB826812). 1 Cercospora aff. canescens CBS 111133 1 Cercospora aff. canescens CBS 111134 Cercospora cf. nicotianae CBS 131.32 1 0.63 Cercospora cf. nicotianae CBS 570.69 1 Cercospora cf. physalidis CBS 765.79 Cercospora apii CBS 110813 0.88 Cercospora apii CPC 5260 1 1 Cercospora asparagi AS16 01 0.78 Cercospora asparagi AS16 02 Cercospora beticola CBS 116454 1 Cercospora beticola CBS 116456 0.72 Cercospora capsici CBS 118712 1 Cercospora capsici CPC 12307 0.96 Cercospora armoraciae CBS 250.67 Cercospora armoraciae CBS 555.71 1 Phylogenetic tree inferred from Bayesian analysis based on Cercospora solani-betacei COAD 2293 0.87 Cercospora zebrina CBS 112723 concatenated sequences (ITS, cmdA and actA). The analysis 0.99 was performed with 10 million generations in MrBayes v. 3.1.1. Cercospora zebrina CBS 112736 1 The Bayesian posterior probability values are indicated at the Cercospora violae CPC 5368 1 0.005 nodes. The tree was rooted to Cercospora zeae­maydis. The Cercospora violae CBS 251.67 new species is highlighted in bold face. Cercospora zeae-maydis CBS 117755 Colour illustrations. Solanum betaceum in subsistence orchard; leaf spots on S. betaceum, Cercospora solani­betacei conidiophore fascicle and conidia. Scale bars = 40 µm (conidiophores) and 10 µm (conidia). Bruno W. Ferreira & Robert W. Barreto, Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, 36570-900, MG, Brazil; e-mail: [email protected] & [email protected] © 2018 Naturalis Biodiversity Center & Westerdijk Fungal Biodiversity Institute.
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