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. 1994 Jan;60(1):278–284. doi: 10.1128/aem.60.1.278-284.1994

Identification of Erwinia stewartii by a ligase chain reaction assay.

W J Wilson 1, M Wiedmann 1, H R Dillard 1, C A Batt 1
PMCID: PMC201300  PMID: 7509585

Abstract

A PCR-coupled ligase chain reaction (LCR) assay was developed to distinguish the plant pathogenic bacterium Erwinia stewartii from other erwiniae. This new technique allows discrimination to the species level on the basis of a single-base-pair difference in the 16S rRNA gene which is unique to E. stewartii. Portions of the 16S rRNA genes of E. stewartii and the closely related Erwinia herbicola were sequenced. From comparison of the two 16S rRNA gene regions, two primer pairs were constructed such that only E. stewartii DNA gave a product in the LCR assay. The ligated product was separated from the radioactively labelled primers by denaturing polyacrylamide gel electrophoresis and visualized by autoradiography. Twenty-four different Erwinia species and strains were tested by PCR-coupled LCR to verify the specificity of the assay, and only E. stewartii strains gave a positive reaction. In addition, infected and healthy plant material was also assayed. E. stewartii was detected in infected plant material, even when large populations of epiphytic bacteria were present. No enrichment was necessary for detection of the pathogen in corn leaves. This assay has potential as a diagnostic technique for the detection of E. stewartii in infected plant and vector material.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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