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• W4376272648 abstract "Plum (Prunus salicina L.) is a traditional fruit in Southern China and is ubiquitous throughout the world. In August 2021, leaves of plum trees showed water-soaking spots and light yellow-green halos with incidence exceeding 50% in Babu district in Hezhou, Guangxi (N23°49'-24°48', E111°12'-112°03'). To isolate the causal agent, three diseased leaves collected from three different trees growing in different orchards were cut into 5 mm × 5 mm pieces, disinfected with 75% ethanol for 10 sec, 2% sodium hypochlorite for 1 min and rinsed three times in sterile water. The diseased pieces were ground in sterile water and then kept static for about 10 min. Ten-fold serial dilutions in water were prepared and 100 µL of each dilution from 10-1 to 10-6 were plated on Luria-Bertani (LB) Agar. After incubation at 28℃ for 48 h, the proportion of isolates with similar morphology was 73%. Three representative isolates (GY11-1, GY12-1 and GY15-1) were selected for further study. The colonies were non-spore-forming, yellow, round, opaque, rod shaped, convex with smooth and bright neat edges. Biochemical test results showed that the colonies were strictly aerobic and gram-negative. The isolates were able to grow on LB agar containing 0-2% (w/v) NaCl and could utilize glucose, lactose, galactose, mannose, sucrose, maltose and rhamnose as a carbon source. They displayed a positive reaction for H2S production, oxidase, catalase and gelatin, but negative for starch. Genomic DNA of the three isolates was extracted for amplification of the 16S rDNA with primers 27F and 1492R. The resulting amplicons were sequenced. Additionally, five housekeeping genes atpD, dnaK, gap, recA, and rpoB of the three isolates were amplified using the corresponding primer pairs and sequenced. The sequences were deposited in GenBank (16S rDNA, OP861004-OP861006; atpD, OQ703328-OQ703330; dnaK, OQ703331-OQ703333; gap, OQ703334-OQ703336; recA, OQ703337-OQ703339; and rpoB, OQ703340-OQ703342). The isolates were identified as Sphingomonasspermidinifaciens based on the phylogenetic tree inferred by maximum-likelihood using MegaX 7.0 of the concatenated six sequences (multilocus sequence analysis, MLSA) compared with sequences from different Sphingomonas type strains . Pathogenicity of the isolates was tested on healthy leaves of the two-year-old plum plants in a greenhouse. The leaves were wounded by a sterilized needle and sprayed with bacterial suspensions prepared in PBS (Phosphate buffer saline) at OD600=0.5. PBS buffer solution was used as negative control. Each isolate was used to inoculate on 20 leaves per plum tree. The plants were covered with plastic bags to maintain high humidity. Dark brown-to-black lesions were observed on leaves 3 days post incubation at 28℃ with constant light. The average diameter of lesions was 1 cm after seven days, but the negative controls were symptomless. Bacteria reisolated from the diseased leaves were the same as the ones used for inoculation on the basis of morphological and molecular identification, fulfilling Koch's postulates. Plant disease caused by a Sphingomonas species has been reported on mango, pomeand Spanish melon. However, this is the first report of S. spermidinifaciens causing leaf spot disease of plum in China. This report will help to develop effective disease control strategies in the future." @default.
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• W4376272648 date "2023-08-21" @default.
• W4376272648 modified "2023-09-30" @default.
• W4376272648 title "Bacterial Leaf Spot of Plum Caused by <i>Sphingomonas spermidinifaciens</i> in Guangxi, China" @default.
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• W4376272648 doi "https://doi.org/10.1094/pdis-04-23-0685-pdn" @default.
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