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Appl. Environ. Microbiol., Aug 1996, 2988-2993, Vol 62, No. 8
CD Smart, B Schneider, CL Blomquist, LJ Guerra, NA Harrison, U Ahrens, KH Lorenz, E Seemuller and BC Kirkpatrick
In order to develop a diagnostic tool to identify phytoplasmas and classify
them according to their phylogenetic group, we took advantage of the
sequence diversity of the 16S-23S intergenic spacer regions (SRs) of
phytoplasmas. Ten PCR primers were developed from the SR sequences and were
shown to amplify in a group-specific fashion. For some groups of
phytoplasmas, such as elm yellows, ash yellows, and pear decline, the SR
primer was paired with a specific primer from within the 16S rRNA gene.
Each of these primer pairs was specific for a specific phytoplasma group,
and they did not produce PCR products of the correct size from any other
phytoplasma group. One primer was designed to anneal within the conserved
tRNA(Ile) and, when paired with a universal primer, amplified all
phytoplasmas tested. None of the primers produced PCR amplification
products of the correct size from healthy plant DNA. These primers can
serve as effective tools for identifying particular phytoplasmas in field
samples.
Copyright © 1996, American Society for Microbiology
Phytoplasma-specific PCR primers based on sequences of the 16S-23S rRNA spacer region
Department of Plant Pathology, University of California, Davis 95616, USA.
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