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• W3139092528 abstract "Pak choi (Brassica rapa subsp. chinensis) is an important vegetable crop native to China, known for high water content and low caloric value, containing high quality of protein, carbohydrates, fiber, vitamins, minerals, and secondary plant metabolites (Acikgoz, 2016). A pak choi field (8,000 sq. ft.) on Oahu, Hawaii, was visited in May 2020. About 10% plants were infected and showed characteristic symptoms of soft rot, wet lesions, macerated infected stem and necrotic leaves (Figure1A-D); leading to the suspect of one of the most devastating bacterial pathogens within genus Pectobacterium (Boluk et al. 2020; Li et al. 2019; Arizala et al. 2020; Arizala and Arif, 2019). Four infected plants were collected from the field, and stems were surface sterilized with 0.6% sodium hypochlorite solution for 30 sec, followed by three consecutive rinses in distilled water. The stems were aseptically macerated, streaked on Crystal violet pectate medium (CVP) (Hélias et al. 2011), and incubated for 48 h at 26 ± 2°C. The peculiar morphological characteristic of pectolytic bacterial pathogen, forming pits on CVP, were observed (Meng et al. 2016) (Figure 1E). Purification of bacterial colonies were done by re-streaking of a single colony on dextrose peptone agar (DPA-without tetrazolium chloride; Norman and Alvarez 1989). DNA was isolated from bacterial cultures using the DNeasy Blood and Tissue Kit (Qiagen, Germantown, MA), respectively. Molecular identification of four strains (PL243-246) were performed by the sequencing region of the housekeeping gene dnaA (chromosomal replication initiation protein) using Pec. dnaA-F1/R1 primer set (Dobhal et al. 2020). The amplified PCR product was enzymatically cleaned using ExoSAP-ITTM (Affymetrix Inc, Santa Clara, CA), and sent for sequencing at the GENEWIZ facility (Genewiz, La Jolla, CA) using both forward and reverse primers. The dnaA gene sequences were aligned using Geneious, and manually edited to remove the errors. The consensus sequences were analyzed with the NCBI BLASTn tool and were deposited in the NCBI GenBank under the accession numbers MT899920-MT899923. The NCBI BLASTn report indicated that all the sequences shared 99-100% identity and query cover with Pectobacterium brasiliense accession numbers MN544627-29. A phylogenetic analysis, using Geneious, was performed with the dnaA sequences representing different Pectobacterium spp., all strains grouped within the clade of P. brasiliense (Figure 2; Arizala et al, 2020). A pathogenicity assay was carried out in three replications on pak choi grown in pots containing commercial pot mixture, and maintained in the controlled-greenhouse (temperature 26-30°C; relative humidity 50-58%). Three-weeks old plant stems were artificially inoculated with 100 µl bacterial suspensions of PL243 (1.3x 10⁸ CFU/ml), PL244 (1.2x 10⁸ CFU/ml), PL 245 (1.2x 10⁸ CFU/ml) and PL246 (1.1x 10⁸CFU/ml); control plants were inoculated with 100 µl of distilled water (Figure 1F). Two days after inoculation, the soft rot and wilting symptoms (Figure 1G-H), similar to the ones observed on the field, were developed for all four strains tested. Bacteria was successfully re-isolated from the inoculated plants; DNA was isolated, amplified, sequenced for dnaA region and analyzed for 100% homology with original strains, to fulfill Koch's postulates. Based on the molecular characteristics re-isolates were identical to the original strains. To the best of our knowledge, this is the first report of P. brasiliense on pak choi in the USA. Recent reports indicated that the pathogen could potentially pose a threat to cruciferous crops, therefore, highlighting a need to conduct a state-wide survey for pectinolytic bacteria, and implement better management strategies to combat the vegetable crop losses." @default.
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• W3139092528 date "2021-07-30" @default.
• W3139092528 modified "2023-10-02" @default.
• W3139092528 title "First Report of Bacterial Soft Rot Disease on Pak Choi (Brassica rapa subsp. chinensis) Caused by Pectobacterium brasiliense in the United States" @default.
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• W3139092528 doi "https://doi.org/10.1094/pdis-08-20-1854-pdn" @default.
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