sp. nov. isolated from watermelon and muskmelon in Serbia.

Six strains isolated from muskmelon and watermelon seedlings affected by stem rot and wilting in Serbia were reported as based on pathogenicity, LOPAT and cell wall fatty acid analyses. Recent bacterial isolates from cucurbit crops displaying -like symptoms in Alabama, USA, were identified as , prompting polyphasic re-evaluation of the Serbian strains. All six strains were found to cause severe disease in watermelon and squash seedlings under greenhouse conditions.

Genomic insights into two new subspecies of strains isolated from diseased foliage in Florida.

The genus comprises 13 species, the majority of which are plant colonizers. However, some species are occasionally isolated from environmental sources, including water and polluted soil, while others are opportunistic human pathogens. Four novel bacterial strains were isolated from diseased foliage of tomato and Boston fern in Florida, USA.

sp. nov., and sp. nov., isolated from watermelon in Florida.

Three fluorescent bacterial strains, K1, K13 and K18, were obtained from watermelon () foliage symptomatic of bacterial leaf spot of cucurbits in Florida. The strains underwent phenotypic characterization, including LOPAT (levan production, oxidase activity, pectolytic activity on potato, arginine dihydrolase production and hypersensitive response (HR) on both tobacco and tomato) and pathogenicity testing on watermelon and squash seedlings. Whole-genome sequencing of the isolates was performed, and multi-locus sequence analysis (MLSA) utilizing housekeeping genes , , and placed the isolates into two distinct clades within the genus.

Evolution of copper resistance in pv. population.

The widespread use of antimicrobials that target bacterial pathogens has driven evolution of resistance, compromising the efficacy of these bactericides. Understanding the emergence and spread of resistance genes via mobile genetic elements is crucial for combating antimicrobial resistance. Copper resistance (CuR) in pv.

Xanthomonas citri pv. eucalyptorum strain 4866-2_S43 (formerly X. axonopodis pv. eucalyptorum): the causal agent of bacterial leaf blight on eucalypts recovered in Argentina.

We report the draft genome assembly of strain 4866-2_S43 isolated from a eucalyptus lesion in Argentina and what until recently was caused by pv. (). The genome size is 5 188 607 bp, with a G+C content of 64.

Amylase-associated genetic pattern in on pepper.

Bacterial leaf spot of pepper (BSP), primarily caused by ), poses a significant challenge to pepper production worldwide. Despite its impact, the genetic diversity of this pathogen remains underexplored, which limits our understanding of its population structure. To bridge this knowledge gap, we conducted a comprehensive analysis using 103 strains isolated from pepper in southwest Florida to characterize genomic and type III effector (T3E) variation in this population.

Interspecies Expression of an EF-HAND CALCIUM-BINDING PROTEIN in Leads to Reduced Virulence and Decreased Immune Evasion in Tomato Plants.

Many phytopathogenic bacteria require a type III secretion system (TTSS) to activate effector-triggered immunity (ETI). We identified a calcium-binding protein, EfhX, in the citrus pathogen subsp. that does not require a TTSS to activate reactive oxygen species (ROS) and elicit a hypersensitive reaction (HR) in tomato leaves following infection.

Insights into bs5 resistance mechanisms in pepper against Xanthomonas euvesicatoria through transcriptome profiling.

Background: Bacterial spot of pepper (BSP), caused by four different Xanthomonas species, primarily X. euvesicatoria (Xe), poses a significant challenge in pepper cultivation. Host resistance is considered the most important approach for BSP control, offering long-term protection and sustainability.

Phylodynamic Insights into Global Emergence and Diversification of the Tomato Pathogen pv. .

The emergence of plant pathogens is often associated with waves of unique evolutionary and epidemiological events. pv. is one of the major pathogens causing bacterial spot disease of tomatoes.

Phenotypic and Genetic Diversity of Xanthomonads Isolated from Pepper ( spp.) in Taiwan from 1989 to 2019.

Bacterial spot caused by spp. is an economically important disease of pepper causing significant yield losses in Taiwan. Monitoring the pathogen population on a continuous basis is necessary for developing disease management strategies.

Draft genomes announcement of Vietnamese strains causing bacterial spot on pepper.

the primary causal agent of bacterial spot of pepper (BSP), poses a significant global challenge, resulting in severe defoliation and yield losses for pepper growers. We present the whole genome sequences of eight strains associated with BSP in Vietnam. These genomes contribute to representation of pepper production regions in the global sample of genomes, enabling the development of precise global disease management strategies.

Elucidating the Mode of Action of Hybrid Nanoparticles of Cu/Zn Against Copper-Tolerant .

The widespread presence of tolerance to copper in species has resulted in the need to develop alternative approaches to control plant diseases caused by xanthomonads. In recent years, nanotechnological approaches have resulted in the identification of novel materials to control plant pathogens. With many metal-based nanomaterials having shown promise for disease control, an important question relates to the mode of action of these new materials.

Bacterial Mutation During Seasonal Epidemics.

Rapidly evolving bacterial pathogens pose a unique challenge for long-term plant disease management. In this study, we investigated the types and rate of mutations in bacterial populations during seasonal disease epidemics. Two phylogenetically distinct strains of the bacterial spot pathogen, , were marked, released in tomato fields, and recaptured at several time points during the growing season.

Unexpected Diversity of Pseudomonads Associated with Bacterial Leaf Spot of Cucurbits in the Southeastern United States.

Bacterial leaf spot of cucurbits (BLS) is an emerging disease in the southeastern United States that is capable of causing widespread outbreaks under conducive conditions. Historically attributed solely to the bacterium pv. , recent studies have identified additional pathovars as causal agents of the disease.

Whole-Genome-Sequence-Based Classification of pv. and Computational Analysis of the Type III Secretion System.

spp. infect a wide range of annual and perennial plants. Bacterial blight in young seedlings of spp.

Population Genomics Reveals an Emerging Lineage of on Pepper.

-the dominant causal agent of bacterial leaf spot of tomato-is an emerging pathogen of pepper, indicative of a potential host expansion across the southeastern United States. However, studies of the genetic diversity and evolution of from pepper remain limited. In this study, the whole-genome sequences of 35 strains isolated from pepper from four fields and two transplant facilities across southwest Florida between 2019 and 2021 were used to compare genomic divergence, evolution, and variation in type III secreted effectors.

Draft genome sequences of 11 strains associated with bacterial spot disease in Turkey.

Bacterial spot is an economically significant disease in tomato and pepper-producing countries globally. We report the whole-genome sequence of 11 strains associated with bacterial spot disease on pepper, tomato and eggplant in the Southeastern Anatolia Region, Turkey. This genomic information can be used as a reference to study the genetic diversity of these species and contribute to illuminating pathogen evolution with respect to host specificity.

A promoter trap in transgenic citrus mediates recognition of a broad spectrum of Xanthomonas citri pv. citri TALEs, including in planta-evolved derivatives.

Citrus bacterial canker (CBC), caused by Xanthomonas citri subsp. citri (Xcc), causes dramatic losses to the citrus industry worldwide. Transcription activator-like effectors (TALEs), which bind to effector binding elements (EBEs) in host promoters and activate transcription of downstream host genes, contribute significantly to Xcc virulence.

Exploring Diversity of Bacterial Spot Associated Population of Pepper in Southwest Florida.

Bacterial spot caused by spp. is a significant disease that challenges pepper growers worldwide and is particularly severe in a hot and humid environment. Understanding the pathogen's population biology is critical for sustainable disease management.

Draft genome sequences of pv. pathotype strain DSM 105780 , isolated from Florida.

The pathogen that causes stem gall in was first identified in Florida and Alabama in 2018 and named pv. . We report the genome sequence of the pathotype strain of this pathogen, pv.

sp nov. and sp nov., isolated from ornamental crops in California.

Five bacterial strains were isolated from symptomatic leaves of , sp. and sp. in California.