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• W4200248859 abstract "Bush lily (Clivia miniata) is an important indoor flower. It is the city flower of Changchun City and has important ornamental and medicinal value in China where it is culitvated on an area of 125 hectare. During the summer of 2018, symptoms of a leaf sheath rot disease were observed on bush lily in 103 greenhouses in Changchun city, Jilin Province. The disease incidence ranged from 25 to 60% in 11 surveyed greenhouses. At the early stage, the diseased plants displayed symptoms as initial leaf sheath lesions. Progressively, the whole leaves wilted, and even the plant ultimately died. Once a leaf exhibits leaf sheath lesions, the whole plant’s ornamental value significantly drops. To identify the pathogen, symptomatic leaves were cut into pieces, surface sterilized, placed on potato dextrose agar (PDA) and incubated for 7 days at 25°C in the dark (Cao et al. 2013; the e-Xtra description for details). Fusarium single-spore isolates were obtained from characteristic colonies (Leslie et al. 2006). Two single-spore isolates were selected for further study. The isolates were identified as Fusarium spp. based on microscopic morphology on PDA. Fusarium-like colonies were white to slightly yellow with abundant cottony mycelia. Single or two-celled (single septum) microconidia were reniform or oval, 8.0 to 9.6×4.0 to 6.0m in size. The elongated conidiophores bearing microconidia in monophialides were observed (Summerbell et al. 2002). Macroconidia were abundant, sickle shaped, 18.8 to 34.8×6.4 to 6.8m, with one to three septa (Taylor et al. 2019). For molecular identification, five regions of ITS, EF1-α, RPB1, RPB2 and β-tubulin genes were amplified and sequenced. Sequences of five different regions exhibited at least 97.98% similiarity with the corresponding DNA sequences in F. solani species complex (FSSC) (the e-Xtra description for details). The phylogenetic analysis based on the EF1-α, RPB1, RPB2 and β-tubulin region sequences revealed that the isolated strain in this study was clustered with only F. solani species in the phylogenetic tree for each region. Based on morphological and molecular analysis, the isolated fungal strains were identified as F. solani. Pathogenicity was confirmed by injecting a conidial suspension (106 spores/mL) of the isolated strains in to surface surface-disinfested leaf sheath of 2-year-old potted healthy plants. As a negative control, four plants were injected with sterilized water. All plants were kept in a greenhouse with controlled conditions: 26°C, 50% to 75% relative humidity. The similar rot symptoms were observed on the leaf sheathes in the inoculated plants 30 days after inoculation whereas the control plants remained asymptomatic. The fungi reisolated from the experimental plants were confirmed to be F. solani by morphology and sequences analysis, thus completing Koch’s postulates. To the best of our knowledge, this is the first report of F. solani causing leaf sheath rot of bush lily in China, where this pathogen has been reported to cause rot diseases of other economically important ornamental plants such as Phalaenopsis, Dendrobium according to the U.S. National Fungus Collections (Farr et al. 2020). In recent years, other Fusarium species have been reported to cause rot diseases on bush lily, including F. proliferatum and F. oxysporum (Farr et al. 2020). This study will also provide critical information on the causal agent for growers to implement disease management strategies." @default.
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• W4200248859 date "2021-12-07" @default.
• W4200248859 modified "2023-10-03" @default.
• W4200248859 title "First Report of Fusarium solani Causing Leaf Sheath Rot of Bush lily in China" @default.
• W4200248859 doi "https://doi.org/10.1094/pdis-02-21-0414-pdn" @default.
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