Host range and molecular typing of Xanthomonas spp. strains isolated from wild rocket (Diplotaxis tenuifolia) in Italy

Sigillo, Loredana; Esposito, Salvatore; Tripodi, Pasquale; Serratore, Giovanna; Pane, Catello

doi:10.1007/s10658-021-02278-9

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…Xcc represents one of the most common pathogens in the Brassicaceae family, including plants with high economic impact. It is endemic in central-southern Italy and it was diagnosed starting from the 1990s in broccoli landrace “Natalino”, in cauliflower and kohlrabi commercial varieties, and up to 2013 in the wild rocket [ 82 , 83 ]. As early as 1952, Xcc was reported as a bacterium primarily spread by seeds [ 84 ], and because of the ineffectiveness of chemicals and lack of resistance genes in local varieties, the importance of starting cultivation by using healthy propagation materials appears crucial [ 85 ].…”

Section: Discussionmentioning

confidence: 99%

Surveillance of Landraces’ Seed Health in South Italy and New Evidence on Crop Diseases

Dell’Olmo

Zaccardelli

Sanajà

et al. 2023

Plants

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During the last three years, more than 300 landraces belonging to different plant species have been the main focus of an Italian valorization research project (AgroBiodiversità Campana, ABC) aiming at analyzing, recovering, preserving, and collecting local biodiversity. In this context, phytosanitary investigation plays a key role in identifying potential threats to the preservation of healthy seeds in gene banks and the successful cultivation of landraces. The surveillance carried out in this study, in addition to highlighting the expected presence of common species-specific pathogens such as Ascochyta pisi in peas, Ascochyta fabae in broad beans, and Macrophomina phaseolina, Xanthomonas axonopodis pv. phaseoli, and Xanthomonas fuscans subsp. fuscans in beans, pointed to the presence of novel microorganisms never detected before in the seeds of some hosts (Apiospora arundinis in common beans or Sclerotinia sclerotiorum and Stemphylium vesicarium in broad beans). These novel seedborne pathogens were fully characterized by (i) studying their morphology, (ii) identifying them by molecular methods, and (iii) studying their impact on adult crop plants. For the first time, this study provides key information about three novel seedborne pathogens that can be used to correctly diagnose their presence in seed lots, helping prevent the outbreaks of new diseases in the field.

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Section: Discussionmentioning

confidence: 99%

Surveillance of Landraces’ Seed Health in South Italy and New Evidence on Crop Diseases

Dell’Olmo

Zaccardelli

Sanajà

et al. 2023

Plants

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“…The same host has also been shown to harbor both pathogenic and non-pathogenic strains (Cesbron et al, 2015;Fernandes et al, 2021;Ramnarine et al, 2022). Furthermore, Xanthomonas species have been shown to have increased their host and geographic range (Curland et al, 2020;Sigillo et al, 2021). Horizontal gene transfer has been identified as one potential mechanism favouring host-range evolution (Chen et al, 2018).Xanthomonas species can colonize novel hosts and inhabit unique ecological niches due to their extensive genomic diversity.…”

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confidence: 99%

Editorial: Emergence and re-emergence of plant diseases caused by Xanthomonas species

2022

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Editorial on the Research Topic Emergence and re-emergence of plant diseases caused by Xanthomonas speciesThe emergence and re-emergence of plant diseases has increased noticeably in recent years. This has been attributed to climate change, monoculture and trade (Willocquet et al., 2020). An example is the occurrence of Xylella fastidiosa in different regions of the world (Almeida and Nunney, 2015). It was described as a "relatively obscure pathogen" in 2002 (Hopkins and Purcell, 2002), but 10 years later it is now considered a major threat to agriculture worldwide.Xanthomonas species are members of the Lysobacteriaceae (previously known as Xanthomonaceae), a family within the class Gammaproteobacteria. They have an extremely wide host range, infecting both monocotyledonous and dicotyledonous plants. The number of first reports of novel Xanthomonas species or pathovars has increased in recent years (Bansai et al., 2022; Dia et al., 2022) as has the appearance of more aggressive strains of known species (Chen et al.). The same host has also been shown to harbor both pathogenic and non-pathogenic strains (Cesbron et al., 2015;Fernandes et al., 2021;Ramnarine et al., 2022). Furthermore, Xanthomonas species have been shown to have increased their host and geographic range (Curland et al., 2020;Sigillo et al., 2021). Horizontal gene transfer has been identified as one potential mechanism favouring host-range evolution (Chen et al., 2018).Xanthomonas species can colonize novel hosts and inhabit unique ecological niches due to their extensive genomic diversity. This rich diversity has been shown to possibly be linked to different production systems (Abrahamian et al., 2019;Klein-Gordon et al., 2021) and cultivated regions (Chen et al., 2021). Xanthomonas species are also an Frontiers in Microbiology frontiersin.org

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The Alternative Host with the Most: Understanding the Ecology of Xanthomonas hortorum pv. carotae on Noncarrot Crops in Central Oregon

Baldino,

Scott,

Dung

2024

Plant Disease

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Bacterial blight of carrot, caused by Xanthomonas hortorum pv. carotae (Xhc), is an economically important disease in carrot (Daucus carota subsp. sativus) seed production. The objectives of this study were to determine if Xhc was present on non-carrot crops grown in central Oregon and if detected, evaluate its ability to colonize alternative hosts. Surveys of three carrot seed fields and adjacent fields of rye (Secale cereale), alfalfa (Medicago sativa), parsley root (Petroselinum crispum var. tuberosum), and Kentucky bluegrass (Poa pratensis) demonstrated that Xhc was present on non-carrot crops. Greenhouse experiments were conducted to determine the ability of Xhc to colonize crops cultivated in the region. Carrot, alfalfa, curly parsley (Petroselinum crispum), Kentucky bluegrass, mint (Mentha x piperita), parsley root, roughstalk bluegrass (Poa trivialis), and wheat (Triticum aestivum) plants were spray-inoculated with Xhc and then destructively sampled at 1-, 7-, 14-, and 28- or 25- days post-inoculation. Xhc populations were quantified using viability quantitative PCR and dilution plating. A significant (P≤0.03) effect of crop was observed at 1-, 14-, and 28- or 25 days in both experiments. While carrot hosted the most Xhc at the final timepoint, other crops supported epiphytic Xhc populations including wheat and both bluegrasses. Mint, parsley root, and alfalfa hosted the least Xhc. Bacterial blight symptoms were observed on carrots, but not on non-carrot crops. This suggests that crops grown in central Oregon have the potential to be asymptomatically colonized by Xhc and may serve as reservoirs of the pathogen in carrot seed production systems.

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Host range and molecular typing of Xanthomonas spp. strains isolated from wild rocket (Diplotaxis tenuifolia) in Italy

Cited by 3 publications

References 41 publications

Surveillance of Landraces’ Seed Health in South Italy and New Evidence on Crop Diseases

Surveillance of Landraces’ Seed Health in South Italy and New Evidence on Crop Diseases

Editorial: Emergence and re-emergence of plant diseases caused by Xanthomonas species

The Alternative Host with the Most: Understanding the Ecology of Xanthomonas hortorum pv. carotae on Noncarrot Crops in Central Oregon

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