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• W3134281623 abstract "Pleoroma fotherghillae, also known as “princess flower”, is an ornamental species native to Brazil and naturalized in several countries (Faravani et al. 2007). P. fotherghillae has a high economic value, with an ornamental and landscape application (Nienow et al. 2010). In September 2018, leaf spots were observed in approximately 80% of the 50 P. fotherghillae plants grown in a nursery in the municipality of Curitiba-Paraná, Brazil. The spots were round-shaped, with a necrotic brown center and a reddish-brown halo, ranging from 1 to 4 mm in diameter. High leaf fall was observed among plants presenting a higher severity. Symptomatic leaves fragments were collected and disinfected as described by (Pereira et al. 2019). The fragments were transferred to a potato dextrose agar medium supplemented with streptomycin sulfate and incubated at 24 ± 1ºC with a photoperiod of 12 h for 7 days. Four monosporic cultures were obtained from colonies isolated. The isolates had a grayish-white cottony aerial mycelium and reverse olive-yellow with black dots. The colonies reached approximately 60 mm in diameter, forming globular and conical pycnidia, brown to black in color with white or cream globular conidial mass. Beta conidia were hyaline, smooth, curved to the size of 19 - 25 x 1 – 1.5 μm (n = 50). No alpha nor gamma conidia were observed. The characteristics are similar to the description of Diaporthe terebinthifolli (Gomes et al. 2013). The total genomic DNA of a representative isolate, LEMIDPRPf-19-02, was extracted for amplification and sequencing of the internal transcribed spacer (ITS) region and partial of the Tubby (TUB) and thyrotroph embryonic factor (TEF) genes. The sequences of the ITS (No MN415990.1), TUB (No MW505549), and TEF (No MW505550) genes were deposited in GenBank. BLAST analysis showed similarity above 99% with D. terebinthifolli sequences (KC343219.1, KC344187.1, and KC343945.1). The multigene phylogenetic analysis, based on Bayesian Inference, grouped the isolate in a clade with other sequences of Diaporthe terebinthifolii. Four healthy plants of P. fotherghillae about 5 months old, were used for pathogenicity testing. A suspension containing 105 conidia/ml was sprayed on the surface of the leaves of four plants to the point of runoff. The plants were covered with a transparent plastic bag for 24 hours. The leaves of four other plants received sterile distilled water and served as the control treatment. The plants were kept in a greenhouse at 20±5ºC. Necrotic lesions appeared 10 to 15 days after inoculation. No symptoms were observed in the control plants. The pathogen was reisolated from symptomatic leaves and had the same characteristics as the isolate LEMIDPRPf-19-02. A representative sample (MBM 331603) was deposited at the Museu do Jardim Botânico (Botanical Garden Museum) - Curitiba, Brazil. Diaporthe terebinthifolii was previously reported as endophytic in Brazil and Uruguay, isolated from Schinus terebinthifolius and Pyrus communis, respectively (Gomes et al. 2013; Sessa et al. 2017). To our knowledge, this is the first report of D. terebinthifolii causing leaf spot on P. fotherghillae in Brazil and worldwide." @default.
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• W3134281623 date "2021-03-01" @default.
• W3134281623 modified "2023-09-27" @default.
• W3134281623 title "First Report of Diaphorte terebinthifolii causing leaf spot on Pleoroma fotherghillae in Brazil" @default.
• W3134281623 doi "https://doi.org/10.1094/pdis-11-20-2508-pdn" @default.
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