Skip to main content

Characterization of Erwinia amylovora strains

The three main aims of the study were the assessment of the genetic relationship between a deviating Erwinia amylovora strain isolated from Amelanchier sp. (Maloideae) grown in Canada and other strains from Maloideae and Rosoideae, the investigation of the variability of the PstI fragment of the pEA29 plasmid using restriction fragment length polymorphism (RFLP) analysis and the determination of the number of short-sequence DNA repeats (SSR) by DNA sequence analysis in representative strains.

METHODS AND RESULTS:
Ninety-three strains obtained from 12 plant genera and different geographical locations were examined by repetitive-sequences PCR using Enterobacterial Repetitive Intergenic Consensus, BOX and Repetitive Extragenic Palindromic primer sets.

Upon the unweighted pair group method with arithmetic mean analysis, a deviating strain from Amelanchier sp. was analysed using amplified ribosomal DNA restriction analysis (ARDRA) analysis and the sequencing of the 16S rDNA gene.

This strain showed 99% similarity to other E. amylovora strains in the 16S gene and the same banding pattern with ARDRA. The RFLP analysis of pEA29 plasmid using MspI and Sau3A restriction enzymes showed a higher variability than that previously observed and no clear-cut grouping of the strains was possible.

The number of SSR units reiterated two to 12 times. The strains obtained from pear orchards showing for the first time symptoms of fire blight had a low number of SSR units.

CONCLUSIONS:
The strains from Maloideae exhibit a wider genetic variability than previously thought. The RFLP analysis of a fragment of the pEA29 plasmid would not seem a reliable method for typing E. amylovora strains. A low number of SSR units was observed with first epidemics of fire blight.

SIGNIFICANCE AND IMPACT OF THE STUDY:
The current detection techniques are mainly based on the genetic similarities observed within the strains from the cultivated tree-fruit crops. For a more reliable detection of the fire blight pathogen also in wild and ornamentals Rosaceous plants the genetic features of deviating E. amylovora strains have to be studied in detail.


"Characterization of Erwinia amylovora strains from different host plants using repetitive-sequences PCR analysis, and restriction fragment length polymorphism and short-sequence DNA repeats of plasmid pEA29.
Barionovi D, Giorgi S, Stoeger AR, Ruppitsch W, Scortichini M
J Appl Microbiol. 2006 May ; 100(5): 1084-94 (Hubmed.org)



Highlight :
Treatment Of Rosacea | Acne Rosacea Antibiotic | Acne Rosacea | Rosacea Creams

Popular posts from this blog

Before And After: A Gorgeous Zen Bathroom Remodel

Before And After: A Gorgeous Zen Bathroom Remodel " casacullen.com/2009/12/rwd-home-kitchen-redesign-before-and-after almost the same issue during my recent 1960s bath remodel, I house in prime vintage condition and wants to zen " We love when sustainability meets beauty in home renovations. And this Japanese-inspired bathroom remodel in by Weston Miles Architects is a prime example. These before photos show a pleasant enough bathroom with bright color and functional traditional cabinetry, though a small sink space, not-so eco-friendly materials, and dim lighting. This after photo shows an incredible remodel that makes use of traditional materials in a modern aesthetic. The focal point is this Japanese soaking tub that the client wanted, and the room grew around that. The room has been opened up for a step-in shower next to the tub, its warm lichen-green balanced against the natural wood of the tub and wood trim. This beautiful remodel exemplifie...
Read more

Prevalence Of And Associated Factors For Dry Eye In A Spanish adult population

To estimate the prevalence of dry eye and to investigate its relationship with lifestyle and systemic factors in a general adult population in north-western Spain. METHODS: A dry eye questionnaire was administered and objective tests were performed in 654 individuals [mean age (Standard deviation): 63.6 (14.4) years, range: 40-96, 37.2% males]. Subjects were considered symptomatic when one or more of the symptoms of the questionnaire were present often or all the time. Schirmer test or= 3 and fluorescein staining >or= 1 were considered indicative of signs. Dry eye was defined as the simultaneous presence of symptoms and at least one sign. A design based analysis was performed and all calculations were weighted to give unbiased estimates. RESULTS: Dry eye prevalence was 11.0% (95%confidence interval [CI] 8.6-13.3). Dry eye was found to be more frequent in women (11.9%, 95%CI 8.8-15.1) than in men (9.0%, 95%CI 5.3-12.6), and was significantly associated with aging (p autoimmune diseas...
Read more

Enhanced Skin Blood Flow And Sensitivity to Noxious Heat Stimuliin papulopustular rosacea

Although patients with rosacea often complain of increased skin sensitivity, there has been no quantitative sensory testing of this phenomenon. Furthermore, cutaneous blood flow in these patients has not been assessed using state-of-the-art laser Doppler imaging (LDI). OBJECTIVES: To assess heat pain thresholds and skin blood flow using quantitative thermal sensory testing and LDI in patients with untreated rosacea . METHODS: Of the total 24 subjects enrolled, 8 had papulopustular rosacea (PPR), 8 had erythematotelangiectatic rosacea (ETR) and 8 were control subjects. Subjective burning perception, heat pain threshold, skin blood flow, and skin temperature was assessed in all subjects. In the ETR and PPR groups, two areas were compared: affected and nonaffected. RESULTS: Heat pain thresholds of areas affected by rosacea were lower than those of nonaffected areas. In addition, subjective burning perception was increased in rosacea patients when compared with control subjects. Altho...
Read more