Population dynamics of Pseudomonas savastanoi pv. phaseolicola in bean, throughout the epiphytic and pathogenic phases

Marques, Ana Maria Campos; Samson, R.

doi:10.1590/s0100-204x2016000500024

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…It is known that for a long time, the causative agent of the basal glume rot of wheat had been found as an epiphyte on non-crops plant species and also on annual and perennial weeds [14]. Weeds' ability to serve as an ecological niche for agents of bacterial diseases that can affect crops has been discussed [16], and it was proved experimentally that weeds could serve as sources of dangerous epiphytic populations of phytopathogenic bacteria [17]. At the same time, the presence of the pathogens common both for cultivated plants and weeds in crops and the problem of the specialization of the pathogens that affect weeds remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Characteristic of Pseudomonas syringae pv. atrofaciens Isolated from Weeds of Wheat Field

Butsenko

Pasichnyk

Kolomiiets³

et al. 2020

Applied Sciences

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The aim of this study was the identification of the causative agent of the basal glume rot of wheat Pseudomonas syringae pv. atrofaciens from the affected weeds in wheat crops, and determination of its virulent properties. Isolation of P. syringae pv. atrofaciens from weeds of wheat crops was carried out by classical microbiological methods. To identify isolated bacteria, their morphological, cultural, biochemical, and serological properties as well as fatty acids and Random Amplification of Polymorphic DNA (RAPD)-PCR (Polymerase chain reaction) profiles with the OPA-13 primer were studied. Pathogenic properties were investigated by artificial inoculation of wheat plants and weed plants, from which bacteria were isolated. For the first time, bacteria that are virulent both for weeds and wheat were isolated from weeds growing in wheat crops. It was shown that the fatty acids profiles of the bacteria isolated from the weeds contained typical for P. syringae pv. atrofaciens fatty acids, in particular, hydroxy acids: 3-hydroxydecanoic, 2-hydroxydodecanoic, and 3-hydroxydodecanoic. RAPD-PCR profiles of the newly isolated strains were identical to those of the collection strains P. syringae pv. atrofaciens UCM B-1011 and P. syringae pv. atrofaciens UCM B-1014 and contained a dominant fragment of 700 bp. The isolated strains, according to their phenotypic and genotypic properties, were identified as P. syringae pv. atrofaciens. It was established that the causative agent of basal glume rot of wheat P. syringae pv. atrofaciens is polyphagous and capable of infecting a wide range of plants. The main control measure for cereals diseases caused by P. syringae pv. Atrofaciens—crop rotations with nonhost species, should be revised, and alternative control methods must be proposed.

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Section: Introductionmentioning

confidence: 99%

Characteristic of Pseudomonas syringae pv. atrofaciens Isolated from Weeds of Wheat Field

Butsenko

Pasichnyk

Kolomiiets³

et al. 2020

Applied Sciences

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“…Studies have shown that halo blight bacterium can rapidly reach high densities without causing visible disease symptoms [2]. This suggests that apparent lack of symptoms is not indicative of a pathogen-free crop.…”

Section: The Pathogen and Disease Symptomsmentioning

confidence: 99%

“…In fact, dispersal of bacteria is likely to precede symptom development, making physical movement of the pathogen within and between crops less detectable. Symptoms can subsequently express following physical injury from Crops 2021, 1 4 rain and hail; these are thought to trigger a widespread pathogenic shift [2]. Therefore, movement of equipment through and between paddocks should be carefully considered, as symptomless mungbeans can harbour the pathogen.…”

Section: The Pathogen and Disease Symptomsmentioning

confidence: 99%

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Halo Blight of Mungbean in Australia

Abdullah¹,

Douglas²

2021

Crops

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Halo blight, one of the major diseases of mungbean, is caused by the bacterium Pseudomonas savastanoi pv. phaseolicola. The pathogen infects the foliar parts of the plant, causing water-soaked spots that eventually develop surrounding yellow margins. The disease is particularly destructive under moderate temperature and high humidity, especially when it occurs during late vegetative through to early reproductive stage. In such conditions, severely infected crops could experience a yield loss up to 70%. Halo blight can be widespread on mungbeans grown in Southern Queensland and Northern New South Wales. However, due to its seedborne and cryptic nature of transmission, the disease is likely to be under-reported. This report addresses major aspects of halo blight symptomology, pathology and epidemiology.

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“…glycinea and P. savastanoi pv. phaseolicola, respectively (Addy & Wahyuni, 2016;Marques & Samson, 2016).…”

Section: Introductionmentioning

confidence: 99%

Detection and characterization of endophytic bacteria causing knot in young olive trees

Khezri

Ghasemi²,

Ahangaran³

2019

AAS

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Olive knot is an important disease in most countries where olives are commercially grown. In the spring of 2015, some galls were observed on the trunk and branches of 4-year-old olive trees in the north of Iran. The bacteria were isolated from galls and all isolates were gram-negative, aerobic, and capable of producing florescent pigment. Other phenotypic characteristics of the isolates were assessed. Pathogenicity tests were carried out on olive branches incubated with different isolates. Primary symptoms were observed after two weeks. Sequences of 16S rRNA and RNA polymerase beta subunit genes of pathogenic isolates were completely similar to Pseudomonas savastanoi pv. savastanoi (Smith 1908) Young et al. 1978 in GenBank. Based on the results from phenotypic analyses, pathogenicity tests and phylogenetic data, the isolates were identified as P. savastanoi pv. savastanoi. The host range of our isolates was specific to olive trees. None of the inoculated oleander (Nerium oleander L.), winter jasmine (Jasminum nudiflorum <a title="John Lindley" href="https://en.wikipedia.org/wiki/John_Lindley">Lindl.</a>), Japanese privet (Ligustrum japonicum Thunb.) and ash (Fraxinus excelsior L.) developed disease symptoms. No difference in disease resistance was observed between six studied olive cultivars. There was no olive tree or orchard around the studied orchard as far as more than one kilometer. As the disease agent listed in Iran’s foreign quarantine pests and diseases list, appropriate quarantine and phytosanitary measures were undertaken to eradicate the disease.

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Population dynamics of Pseudomonas savastanoi pv. phaseolicola in bean, throughout the epiphytic and pathogenic phases

Cited by 7 publications

References 23 publications

Characteristic of Pseudomonas syringae pv. atrofaciens Isolated from Weeds of Wheat Field

Characteristic of Pseudomonas syringae pv. atrofaciens Isolated from Weeds of Wheat Field

Halo Blight of Mungbean in Australia

Detection and characterization of endophytic bacteria causing knot in young olive trees

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