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• W4381310010 abstract "Hemerocallis citrina is a popular vegetable crop. Its eatable flower buds contain abundant nutrients, especially lecithin (Guo et al., 2022). In March 2021, leaf spot disease was observed on 90% cultivated H. citrina seedlings in Dazhou city (31°17'56″ N, 107°31'59″ E), Sichuan, China. Totally, 15 diseased seedlings were sampled (three samples per 666 m2). The symptomatic leaves were cut into pieces (5 × 3 mm), superficially disinfected with 70% ethanol for 20 s and 1% Sodium hypochlorite (NaClO) for 40 s, and washed with sterile distilled water six times. The disinfected tissues were incubated on PDA amended with streptomycin sulfate (50 mg/L) in dark at 25 ℃. Two days later, hyphal tips from the edges of growing colonies were transferred to fresh PDA plates. Finally, 40 purified isolates were obtained. Using primer pairs ITS1/ITS4 (Glass & Donaldson, 1995), amplified rDNA internal transcribed spacer (ITS) regions indicated that these isolates belonged to different genera, mainly including Epicoccum, Fusarium and Colletotrichum. Six isolates of Epicoccum genus similar in morphology, named HHC46, HHC47, HHC491, HHC492, HHC51 and HHC58, were selected for identification. Cultured on oatmeal agar for 7 days, colonies were initially white and villose. Fourteen days later, mycelia started to secrete scarlet pigment. The NaOH spot test showed color changed from green to red, identical to that in Epicoccum species (Boerema et al., 2004). Meanwhile, colonies produced abundant conidia. Conidia were ellipsoidal, aseptate, and 4.1 to 6.5 × 1.3 to 2.9 µm (n = 30). Chlamydospores were also observed, globose to subglobose. The morphological features were similar to those of Epicoccum latusicollum (Xu et al., 2022). The DNA sequences of Beta-tubulin (TUB2) and DNA-directed RNA polymerase II second largest subunit (RPB2) of six isolates were amplified and sequenced, using primer pairs Bt2a/Bt2b (Glass & Donaldson, 1995), and RPB2-5f2/RPB2-7cr (O'Donnell et al., 2012), respectively. BLASTN searches indicated our ITS (OP107240 - OP107245), TUB2 (OP131865 - OP131870) and RPB2 (OP131871 - OP131876) sequences except one TUB2 (OP131867), showed 100% identity to the corresponding sequences of E. latusicollum CGMCC:3.18346 (KY742101, KY742343 and KY742174, respectively). There was a nucleotide divergence between OP131867 and reference sequence. Based on concatenated ITS, TUB2 and RPB2 sequences, the constructed phylogenetic tree of Epicoccum species, confirmed that our isolates were E. latusicollum. To test pathogenicity, 2-year-old healthy seedlings of cultivar chuanhuanghua No.1 were sprayed with conidial suspension of HHC51 (105 conidia/mL), with controls treated with sterile distilled water. Each treatment (biological replicates = 3) was incubated in a greenhouse (at 25°C under 90% relative humidity, 16/8 h light/dark cycle). The experiment was repeated twice. After 18 days, leaf spot symptom in inoculated seedlings appeared. Whereas, non-inoculated controls showed no symptom. The pathogens were re-isolated from diseased leaves and identified as E. latusicollum, based on morphology and molecular methods described above. E. sorghinum was previously reported as causal agent of leaf spot in H. citrina (Ma et al., 2021). To our knowledge, this is the first report of E. latusicollum causing leaf spot in H. citrina worldwide. Our study will assist with monitoring disease distribution in H. citrina and host diversity of E. latusicollum (Chen et al., 2017)." @default.
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• W4381310010 date "2023-09-19" @default.
• W4381310010 modified "2023-09-27" @default.
• W4381310010 title "First Report of Leaf Spot Caused by <i>Epicoccum latusicollum</i> on <i>Hemerocallis citrina</i> in China" @default.
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• W4381310010 doi "https://doi.org/10.1094/pdis-03-23-0435-pdn" @default.
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