Hypervariations of a protease-encoding gene, PD0218 (pspB), in Xylella fastidiosa strains causing almond leaf scorch and Pierce's disease in California.

作者: J. Chen , E. Civerolo , K. Tubajika , S. Livingston , B. Higbee

DOI: 10.1128/AEM.02386-07

关键词:

摘要: Xylella fastidiosa is a gram-negative plant pathogenic bacterium that causes almond leaf scorch disease (ALSD) and Pierce's (PD) of grape in many regions North America Mexico. Of the two 16S rRNA gene genotypes described California, A genotype strains cause ALSD only G both PD ALSD. While different diseases, little known about their genetic variation. In this study, we identified putative protease locus, PD0218 (pspB), genome X. evaluated variation at locus populations. contains tandem repeats ACDCCA, translated to threonine proline (TP), upstream conserved domain. Among 116 isolated from seven locations repeat numbers (TRNs) varied 9 47, with total 30 TRN genotypes, indicating possesses an active mechanism for contracting expanding locus. Significant was found among (mean = 29.9), which could be further divided into groups: PD-Gsmall 17.3) PD-Glarge 44.3). Less 21.7). The even smaller after were subdivided 13.3, genotype; mean 27.1, genotype). Genetic potentially useful sensitive discrimination strains. However, stability, range, correlation phenotypes should epidemiological applications such as pathotype identification delineation pathogen origin.

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