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Detection and Diversity Assessment of Xylella fastidiosa in Field-Collected Plant and Insect Samples by Using 16S rRNA and gyrB Sequences

Identifieur interne : 000743 ( Pmc/Corpus ); précédent : 000742; suivant : 000744

Detection and Diversity Assessment of Xylella fastidiosa in Field-Collected Plant and Insect Samples by Using 16S rRNA and gyrB Sequences

Auteurs : Jorge L. M. Rodrigues ; M. E. Silva-Stenico ; J. E. Gomes ; J. R. S. Lopes ; S. M. Tsai

Source :

RBID : PMC:165181

Abstract

The causal agent of diseases in many economically important plants is attributed to the xylem-limited bacterium Xylella fastidiosa. The detection of this plant pathogen has been hampered due to its difficult isolation and slow growth on plates. Nearly complete nucleotide sequences of the 16S rRNA gene and partial sequences of the gyrB gene were determined for 18 strains of X. fastidiosa isolated from different plant hosts. A phylogenetic analysis, based on gyrB, grouped strains in three clusters; grape-isolated strains formed one cluster, citrus-coffee strains formed another cluster, and a third cluster resulted from all other strains. Primer pairs designed for the 16S rRNA and gyrB genes were extensively searched in databases to verify their in silico specificity. Primer pairs were certified with 30 target and 36 nontarget pure cultures of microorganisms, confirming 100% specificity. A multiplex PCR protocol was developed and its sensitivity tested. Sequencing of PCR products confirmed the validity of the multiplex PCR. Xylella fastidiosa was detected in field-collected plants, disease vector insects, and nonsymptomatic but infected plants. Specific detection of X. fastidiosa may facilitate the understanding of its ecological significance and prevention of spread of the disease.


Url:
DOI: 10.1128/AEM.69.7.4249-4255.2003
PubMed: 12839807
PubMed Central: 165181

Links to Exploration step

PMC:165181

Le document en format XML

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<p>The causal agent of diseases in many economically important plants is attributed to the xylem-limited bacterium
<italic>Xylella fastidiosa.</italic>
The detection of this plant pathogen has been hampered due to its difficult isolation and slow growth on plates. Nearly complete nucleotide sequences of the 16S rRNA gene and partial sequences of the
<italic>gyrB</italic>
gene were determined for 18 strains of
<italic>X. fastidiosa</italic>
isolated from different plant hosts. A phylogenetic analysis, based on
<italic>gyrB</italic>
, grouped strains in three clusters; grape-isolated strains formed one cluster, citrus-coffee strains formed another cluster, and a third cluster resulted from all other strains. Primer pairs designed for the 16S rRNA and
<italic>gyrB</italic>
genes were extensively searched in databases to verify their in silico specificity. Primer pairs were certified with 30 target and 36 nontarget pure cultures of microorganisms, confirming 100% specificity. A multiplex PCR protocol was developed and its sensitivity tested. Sequencing of PCR products confirmed the validity of the multiplex PCR.
<italic>Xylella fastidiosa</italic>
was detected in field-collected plants, disease vector insects, and nonsymptomatic but infected plants. Specific detection of
<italic>X. fastidiosa</italic>
may facilitate the understanding of its ecological significance and prevention of spread of the disease.</p>
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<subject>Plant Microbiology</subject>
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<title-group>
<article-title>Detection and Diversity Assessment of
<italic>Xylella fastidiosa</italic>
in Field-Collected Plant and Insect Samples by Using 16S rRNA and
<italic>gyrB</italic>
Sequences</article-title>
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<given-names>Jorge L. M.</given-names>
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<aff id="aff1">Centro de Energia Nuclear na Agricultura,
<label>1</label>
Departamento de Entomologia, Fitopatologia e Zoologia Agrícola, ESALQ, Universidade de São Paulo, Piracicaba, São Paulo 13400-970, Brazil
<label>2</label>
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<label>*</label>
<p>Corresponding author. Mailing address: Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Av. Centenário, 300, Piracicaba, SP 13400-970, Brazil. Phone: 55-19-3429-4600. Fax: 55-19-3429-4822. E-mail:
<email>jorgelmr@cena.usp.br</email>
.</p>
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<pub-date pub-type="ppub">
<month>7</month>
<year>2003</year>
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<volume>69</volume>
<issue>7</issue>
<fpage>4249</fpage>
<lpage>4255</lpage>
<history>
<date date-type="received">
<day>13</day>
<month>11</month>
<year>2002</year>
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<date date-type="accepted">
<day>16</day>
<month>4</month>
<year>2003</year>
</date>
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<copyright-statement>Copyright © 2003, American Society for Microbiology</copyright-statement>
<copyright-year>2003</copyright-year>
<abstract>
<p>The causal agent of diseases in many economically important plants is attributed to the xylem-limited bacterium
<italic>Xylella fastidiosa.</italic>
The detection of this plant pathogen has been hampered due to its difficult isolation and slow growth on plates. Nearly complete nucleotide sequences of the 16S rRNA gene and partial sequences of the
<italic>gyrB</italic>
gene were determined for 18 strains of
<italic>X. fastidiosa</italic>
isolated from different plant hosts. A phylogenetic analysis, based on
<italic>gyrB</italic>
, grouped strains in three clusters; grape-isolated strains formed one cluster, citrus-coffee strains formed another cluster, and a third cluster resulted from all other strains. Primer pairs designed for the 16S rRNA and
<italic>gyrB</italic>
genes were extensively searched in databases to verify their in silico specificity. Primer pairs were certified with 30 target and 36 nontarget pure cultures of microorganisms, confirming 100% specificity. A multiplex PCR protocol was developed and its sensitivity tested. Sequencing of PCR products confirmed the validity of the multiplex PCR.
<italic>Xylella fastidiosa</italic>
was detected in field-collected plants, disease vector insects, and nonsymptomatic but infected plants. Specific detection of
<italic>X. fastidiosa</italic>
may facilitate the understanding of its ecological significance and prevention of spread of the disease.</p>
</abstract>
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