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• W4308766372 abstract "Ohio is one of the top five floriculture producers in the United States, grossing over $200 million annually (NASS 2019). Within the international floriculture trade, gladiolus cut flowers represent the fifth highest grossing crop (Ahmed et al. 2002). In September 2021, the Ornamental Crops Pathology Lab at the Ohio State University received a gladiolus (Gladiolus spp.) sample of an unknown cultivar from a home garden in Franklin Co., OH where several plants had failed to grow from planted corms or were stunted and displaying symptoms of disease. Bleached, water-soaked spots with necrotic margins along the flowering stems, stunted flowers with partial necrosis, and necrotic bracts were observed on the submitted sample. Bacterial isolations were performed by surface disinfesting small sections of bract tissue from the border of a lesion by soaking in 10% bleach for 30 sec and rinsing twice in sterile water, macerating the tissue in sterile water, and streaking the suspension on nutrient agar (NA) plates. Plates were incubated at 28°C for 48 hours and the resulting colonies were purified by re-streaking a single colony on NA twice. Bacterial colony morphology on NA presented as cream-colored and shiny with an irregular form and undulate margin. Five in vitro tests were performed using one representative isolate to identify the bacterium to the genus level: (1) confirmed levan production, (2) confirmed pectinolytic activity, (3) confirmed ability to grow at 40°C, (4) inability to grow under anaerobic conditions, and (5) a negative oxidase test (Schaad et al. 2000). All test results identified the genus as Burkholderia. To identify to species level, gyrase subunit B (gyrB) and RNA polymerase subunit D (rpoD) markers were PCR amplified and sequenced using primers UP1-E/AprU, and 70F2/70R2, respectively (Maeda et al. 2006). NCBI GenBank BLASTn comparison showed that the gyrB sequence shared 99.33% identity to the type strain of B. gladioli (CP009323.1), while the rpoD sequence showed 99.53% identity (CP009322.1). Sequences were deposited in GenBank under accession numbers ON597852 (gyrB) and ON597853 (rpoD). To confirm pathogenicity, each of two Gladiolus communis 'Mini Elvira' potted plants were inoculated with two bacterial and two control treatments (3 leaves/treatment/plant) as follows: leaf infiltration with 1 mL of either (i) a distilled water-Tween 20 (0.03% v/v) bacterial suspension (106 cfu/mL) or (ii) a sterile water-Tween 20 suspension using a needle-less syringe; foliar spray with either (iii) the bacterial suspension or (iv) water-Tween suspension until run-off. Following inoculation, plants were covered for 24 hours with a plastic bag to increase humidity and favor infection and maintained in a greenhouse at an average temperature of 23°C. After 3 days, water-soaked, necrotic lesions were observed on the inoculated plants regardless of inoculation method, while control leaves remained asymptomatic. To fulfill Koch's postulates, bacteria were re-isolated from the lesions 7 days post-inoculation and confirmed to be identical to the original isolate based on rpoD gene sequencing. Bacterial scab of gladiolus was reported in Ohio in the late 1900s as caused by Pseudomonas gladioli (syn. P. marginata; Ellett, 1989). To the best of our knowledge, this report represents the first molecular identification of the causal agent as Burkholderia gladioli. In Ohio, the pathogen has also been observed causing slippery skin on onion but not officially reported in the peer-reviewed literature. Additionally, B. gladioli has been reported in other parts of the United States on orchid, corn, and rice (Keith et al. 2005; Lu et al. 2007; Nandakumar et al. 2009). Given the significant role of gladiolus within Ohio's floricultural trade, as well as the ability of this pathogen to infect other regional crops, monitoring of bacterial scab is important for floriculture and field crop growers alike." @default.
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• W4308766372 date "2023-06-01" @default.
• W4308766372 modified "2023-09-26" @default.
• W4308766372 title "Confirmation of <i>Burkholderia gladioli</i> as the Causal Agent of Bacterial Scab on Gladiolus (<i>Gladiolus</i> sp.) in Ohio" @default.
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• W4308766372 doi "https://doi.org/10.1094/pdis-10-22-2309-pdn" @default.
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