First Report of <i>Xanthomonas arboricola</i> Causing Bacterial Blight on Pecan Trees in Portugal

Fernandes, Clovis Torres; Sousa, Rui Maia; Tavares, Fernando; Cruz, Leonor

doi:10.1094/pdis-03-18-0467-pdn

Cited by 3 publications

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“…Indeed, a previous study has reported the identification of two X. arboricola strains isolated from symptomatic leaves of a pecan tree ( Carya illinoinensis ), which are pathogenic to both pecan and walnut trees [14]. These data raise the need to understand how the genetic makeup of plant bacterial pathogens, such as Xanthomonas , links with a diversifying range of plant hosts.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Furthermore, MLSA results revealed that several X. arboricola strains isolated from walnut, including both pathogenic and non-pathogenic strains, do not cluster with the members of juglandis pathovar [ 9, 14 ]. Indeed, a previous study has reported the identification of two X. arboricola strains isolated from symptomatic leaves of a pecan tree ( Carya illinoinensis ), which are pathogenic to both pecan and walnut trees [ 14 ]. These data raise the need to understand how the genetic makeup of plant bacterial pathogens, such as Xanthomonas , links with a diversifying range of plant hosts.…”

Section: Introductionmentioning

confidence: 99%

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Xanthomonas euroxanthea sp. nov., a new xanthomonad species including pathogenic and non-pathogenic strains of walnut

Martins

Fernandes

Blom

et al. 2020

International Journal of Systematic and Evolutionary Microbiology

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We describe a novel species isolated from walnut (Juglans regia) which comprises non-pathogenic and pathogenic strains on walnut. The isolates, obtained from a single ornamental walnut tree showing disease symptoms, grew on yeast extract–dextrose–carbonate agar as mucoid yellow colonies characteristic of Xanthomonas species. Pathogenicity assays showed that while strain CPBF 424T causes disease in walnut, strain CPBF 367 was non-pathogenic on walnut leaves. Biolog GEN III metabolic profiles disclosed some differences between strains CPBF 367 and CPBF 424T and other xanthomonads. Multilocus sequence analysis with seven housekeeping genes (fyuA, gyrB, rpoD, atpD, dnaK, efp, glnA) grouped these strains in a distinct cluster from Xanthomonas arboricola pv. juglandis and closer to Xanthomonas prunicola and Xanthomonas arboricola pv. populi. Average nucleotide identity (ANI) analysis results displayed similarity values below 93 % to X. arboricola strains. Meanwhile ANI and digital DNA–DNA hybridization similarity values were below 89 and 50 % to non-arboricola Xanthomonas strains, respectively, revealing that they do not belong to any previously described Xanthomonas species. Furthermore, the two strains show over 98 % similarity to each other. Genomic analysis shows that strain CPBF 424T harbours a complete type III secretion system and several type III effector proteins, in contrast with strain CPBF 367, shown to be non-pathogenic in plant bioassays. Taking these data altogether, we propose that strains CPBF 367 and CPBF 424T belong to a new species herein named Xanthomonas euroxanthea sp. nov., with CPBF 424T (=LMG 31037T=CCOS 1891T=NCPPB 4675T) as the type strain.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Xanthomonas euroxanthea sp. nov., a new xanthomonad species including pathogenic and non-pathogenic strains of walnut

Martins

Fernandes

Blom

et al. 2020

International Journal of Systematic and Evolutionary Microbiology

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Xanthomonas arboricola

2021

CABI Compendium

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Effect of Plasma-Activated Water (PAW) Generated Using Non-Thermal Atmospheric Plasma on Phytopathogenic Bacteria

Ghimire,

Pendyala,

Patras

et al. 2024

Plant Disease

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Plasma-activated water (PAW) exhibits potent antimicrobial properties attributed to the generation of diverse reactive oxygen and nitrogen species. This study assessed the effectiveness of PAW in vitro against phytopathogenic Xanthomonas arboricola and Pseudomonas syringae pv. syringae, which cause diseases on ornamental plants. Extending the plasma activation time of water and the incubation time of bacterial suspension in PAW increased the effectiveness of PAW. Treatments consisting of PAW activation using a power output of 200 Watts and a frequency of 50 Hz at different activation times and target population incubation times revealed significantly different effectiveness against P. syringae pv. syringae and X. arboricola. X. arboricola (reduction of 4.946 ± 0.20 log10 CFU/mL) was more sensitive to PAW inactivation than P. syringae pv. syringae (reduction of 3 ± 0.15 log10 CFU/mL). The plasma activation of water for 20 min followed by incubation of bacterial population for 180 min was proven to be the most effective treatment combination. The plasma activation time dose required to reduce the population by 90% was 7.47 ± 1.09 min for P. syringae pv. syringae and 4.45 ± 1.81 min for X. arboricola incubated for 180 min in PAW. The results of this study have the potential to further contribute to assessment of the effects of PAW on pathogen infected plant tissues. In addition, the findings of this study could aid in further characterization of the reactive species formed during the plasma activation of water.

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First Report of Xanthomonas arboricola Causing Bacterial Blight on Pecan Trees in Portugal

Cited by 3 publications

References 4 publications

Xanthomonas euroxanthea sp. nov., a new xanthomonad species including pathogenic and non-pathogenic strains of walnut

Xanthomonas euroxanthea sp. nov., a new xanthomonad species including pathogenic and non-pathogenic strains of walnut

Xanthomonas arboricola

Effect of Plasma-Activated Water (PAW) Generated Using Non-Thermal Atmospheric Plasma on Phytopathogenic Bacteria

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