Occurrence of a New Orange Variant of <i><scp>C</scp>urtobacterium flaccumfaciens</i> pv<i>. flaccumfaciens</i>, Causing Common Bean Wilt in <scp>I</scp>ran

Osdaghi, Ebrahim; Lak, Mohammad Reza

doi:10.1111/jph.12322

Cited by 14 publications

(4 citation statements)

References 15 publications

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“…Cells from fresh culture grown on laboratory media are sometimes quite pleomorphic, with cell morphologies ranging from large globose forms to the typical short, slightly club-shaped rods (EFSA et al, 2019;Li et al, 2018). Plant-pathogenic coryneform bacteria are well known for producing a variety of lipidsoluble carotenoid pigments on culture media (Harveson, 2015;Osdaghi & Lak, 2015;Osdaghi et al, 2016) while C. sepedonicus along with the sugarcane ratoon stunting pathogen Leifsonia xyli subsp. xyli are the only two that characteristically do not produce pigments (Davis, 1986).…”

Section: Bac Teriolog Ic Al Fe Ature Smentioning

confidence: 99%

Bacterial ring rot of potato caused by Clavibacter sepedonicus: A successful example of defeating the enemy under international regulations

Osdaghi

Wolf

Abachi

et al. 2022

Molecular Plant Pathology

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Background Bacterial ring rot of potato (Solanum tuberosum) caused by the gram‐positive coryneform bacterium Clavibacter sepedonicus is an important quarantine disease threatening the potato industry around the globe. Since its original description in 1906 in Germany, management of ring rot has been a major problem due to the seedborne nature (via seed tubers not true seeds) of the pathogen allowing the bacterium to be transmitted long distances via infected tubers. Disease symptoms On growing potato plants: interveinal chlorosis on leaflets leading to necrotic areas and systemic wilt. On infected tubers: vascular tissues become yellowish brown with a cheesy texture due to bacterial colonization and decay. Host range Potato is the main host of the pathogen, but natural infection also occurs on eggplant, tomato, and sugar beet. Taxonomic status of the pathogen Class: Actinobacteria; Order: Actinomycetales; Family: Microbacteriaceae; Genus: Clavibacter; Species: Clavibacter sepedonicus (Spieckermann and Kotthoff 1914) Li et al. 2018. Synonyms (nonpreferred scientific names) Aplanobacter sepedonicus; Bacterium sepedonicum; Corynebacterium sepedonicum; Corynebacterium michiganense pv. sepedonicum; Clavibacter michiganensis subsp. sepedonicus. Microbiological properties Gram‐positive, club‐shaped cells with creamy to yellowish‐cream colonies for which the optimal growth temperature is 20–23°C. Distribution Asia (China, Japan, Kazakhstan, Nepal, North Korea, Pakistan, South Korea, Uzbekistan, the Asian part of Russia), Europe (Belarus, Bulgaria, Czech Republic, Estonia, Finland, Georgia, Germany, Greece, Hungary, Latvia, Lithuania, Norway, Poland, Romania, European part of Russia, Slovakia, Spain, Sweden, Turkey, Ukraine), and North America (Canada, Mexico, USA). Phytosanitary categorization CORBSE: EPPO A2 list no. 51. EU; Annex designation I/A2.

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Section: Bac Teriolog Ic Al Fe Ature Smentioning

confidence: 99%

Bacterial ring rot of potato caused by Clavibacter sepedonicus: A successful example of defeating the enemy under international regulations

Osdaghi

Wolf

Abachi

et al. 2022

Molecular Plant Pathology

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“…Colony growth on nutrient broth yeast (NBY) extract medium is slow and fluidal. The colony colour varies among yellow, orange, pink, and red pigmentation (Collins and Jones, ; Harveson et al , ; Osdaghi and Lak, ; Osdaghi et al , ). Unlike yellow‐, orange‐, pink‐, and red‐pigmented variants, which are named corresponding to colony colour on culture media, the purple variant does not produce purple‐coloured colonies.…”

Section: Bacteriological Featuresmentioning

confidence: 99%

Bacterial wilt of dry beans caused by Curtobacterium flaccumfaciens pv. flaccumfaciens: A new threat from an old enemy

Osdaghi

Young

Harveson

2020

Molecular Plant Pathology

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This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.In this review, we provide an updated overview on the aetiology, epidemiology, and management of bacterial wilt of dry beans and the current taxonomic status of the causal agent Curtobacterium flaccumfaciens pv. flaccumfaciens. AbstractBacterial wilt and tan spot of dry beans (family Fabaceae), caused by Curtobacterium flaccumfaciens pv. flaccumfaciens, is an important emerging disease threatening the edible legume industry around the globe. The management of bacterial wilt has been a major problem since its original description in 1922. This is in part due to the seedborne nature of the pathogen allowing the bacterium to be transmitted long distances via infected seeds, as well as a lack of detailed molecular information concerning the pathogenicity repertoires and virulence determinates of the pathogen. Identification can also be difficult owing to the presence of five different colony colour variants (i.e., yellow, orange, pink, purple, and red) on culture media. In this review, we provide an overview of the aetiology, epidemiology, and management strategies of bacterial wilt disease. First, a comprehensive and comparative symptomology of the disease on different dry bean species is described. Then, the taxonomic history of the causal agent and utility of high-throughput sequencing-based approaches in the precise characterization of the pathogen is explained. Furthermore, we provide an updated outline on the global distribution of the pathogen, highlighting expansion of the causal agent into the areas with no history of the disease until the beginning of the current century. Finally, because there are limited options for use of conventional pesticides against the pathogen, we highlight the use of integrated pest management strategies, for example quarantine inspections, resistant cultivars, and crop sanitation, to combat the risk of bacterial wilt disease in the dry bean industry. Disease symptoms: Interveinal chlorosis on leaflets leading to necrotic areas and systemic wilt. Seed discolouration to yellow, orange, pink, or purple is seen in whiteseeded cultivars. Host range: Causes bacterial wilt and tan spot disease on edible dry beans in the Fabaceae family, including common bean (Phaseolus vulgaris), cowpea (Vigna unguiculata), mungbean (Vigna radiata), soybean (Glycine max), as well as a number of weed species.

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“…flaccumfaciens are systemically infected via the vascular system (Schuster and Smith, ; Hsieh et al., ). Generally, infected seeds appear asymptomatic, as well as infected pods, while sometime infected seeds are discoloured or yellow, orange or purple irregularly pigmented on their surface or on the hilus (Schuster and Christiansen, ; Schuster et al., ; Huang et al., ; Harveson and Vidaver, ; Harveson et al., ; Osdaghi and Lak, ; Osdaghi et al., ). Secondary (i.e.…”

Section: Pest Categorisationmentioning

confidence: 99%

“…Within the pathovar flaccumfaciens , variants have been described based on pigments that may be produced in vitro on agarised media or in vivo in seeds (Schuster and Christiansen, ; Schuster et al., ; Huang et al., ; Harveson and Vidaver, ; Harveson et al., ; Osdaghi and Lak, ; Osdaghi et al., ). Those variants may also differ in their virulence (Harveson and Vidaver, ; Osdaghi et al., ).…”

Section: Pest Categorisationmentioning

confidence: 99%

Pest categorisation of Curtobacterium flaccumfaciens pv. flaccumfaciens

Jeger¹,

Bragard²,

Candresse³

et al. 2018

EFS2

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Following a request from the European Commission, the EFSA Panel on Plant Health performed a pest categorisation of the seed-borne bacterium Curtobacterium flaccumfaciens pv. flaccumfaciens. The pest is regulated in Council Directive 2000/29/EC (Annex IIB) as a harmful organism whose introduction into, and spread within, the protected zones (PZ) of Greece, Portugal and Spain shall be banned if present on seeds of Phaseolus vulgaris and of Dolichos. The bacterium is widely distributed outside the EU and causes a systemic vascular disease (bacterial wilt of bean) as well as bacterial tan spot disease on soybean. The pest was sporadically recorded in several EU Member States in the past, but is currently not known to occur in the EU. The identity of the bacterium is well established and identification methods are available. The major host is common bean (Phaseolus vulgaris), but other crops and weeds are, or may be, hosts or play a role as reservoirs, with uncertainties. Seed transmission remains uncertain for minor and alternative host species. The main pathway for entry is seed. The role of other pathways (e.g. irrigation water and infected residues) is uncertain. Should the bacterium enter the EU (including the PZ), it may establish, spread and have an impact on its host crops. The use of healthy seeds is the most effective control measure. Curtobacterium flaccumfaciens pv. flaccumfaciens fits all the criteria assessed by EFSA to be regarded as a Union quarantine pest.

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Occurrence of a New Orange Variant of Curtobacterium flaccumfaciens pv. flaccumfaciens, Causing Common Bean Wilt in Iran

Cited by 14 publications

References 15 publications

Bacterial ring rot of potato caused by Clavibacter sepedonicus: A successful example of defeating the enemy under international regulations

Bacterial ring rot of potato caused by Clavibacter sepedonicus: A successful example of defeating the enemy under international regulations

Bacterial wilt of dry beans caused by Curtobacterium flaccumfaciens pv. flaccumfaciens: A new threat from an old enemy

Pest categorisation of Curtobacterium flaccumfaciens pv. flaccumfaciens

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