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Genetic diversity among Curtobacterium flaccumfaciens pv. flaccumfaciens populations in the American High Plains

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Curtobacterium flaccumfaciens pv. flaccumfaciens is a Gram-positive bacterium and has reemerged as an incitant of bacterial wilt in common (dry, edible) beans in western Nebraska, eastern Colorado, and southeastern Wyoming. Curtobacterium flaccumfaciens pv. flaccumfaciens is diverse phenotypically and genotypically and is represented by several different pathogen color variants. The population structure of 67 strains collected between 1957 and 2009, including some isolated from alternate hosts, was determined with 3 molecular typing techniques: amplified fragment length polymorphism (AFLP), repetitive extragenic palindromic polymerase chain reaction (rep-PCR), and pulsed-field gel electrophoresis (PFGE). All 3 typing techniques showed a great degree of population heterogeneity, but they were not congruent in cluster analysis of the C. flaccumfaciens pv. flaccumfaciens populations. Cluster analysis of a composite data set (AFLP, PFGE, and rep-PCR) using averages from all experiments yielded 2 distinct groups: cluster A included strains with colonies of yellow, orange, and pink pigments, and cluster B had strains of only yellow pigment. Strains producing purple extracellular pigment were assigned to both clusters. Thus, C. flaccumfaciens pv. flaccumfaciens is diverse phenotypically and genotypically.
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Keywords: AFLP; DNA fingerprinting; PFGE; Phaseolus vulgaris; bean bacterial wilt; empreinte d’ADN; flétrissure bactérienne du haricot; rep-PCR

Document Type: Research Article

Affiliations: 1: Plant Pathology Department, University of Nebraska-Lincoln, 204 Morrison Hall, Lincoln, NE 68583-0900, USA. 2: Plant Pathology Department, University of Nebraska-Lincoln, 435 Plant Science Hall, Lincoln, NE 68583-0722, USA. 3: Plant Pathology Department, University of Nebraska-Lincoln, 406C Plant Science Hall, Lincoln, NE 68583-0722, USA. 4: University of Nebraska, Panhandle Research and Extension Center, 4502 Avenue I, Scottsbluff, NE 69361, USA.

Publication date: June 9, 2012

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