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Gibberella xylarioides Sensu Lato from Coffea canephora: a New Mating Population in the Gibberella fujikuroi Species Complex

Identifieur interne : 000746 ( Pmc/Corpus ); précédent : 000745; suivant : 000747

Gibberella xylarioides Sensu Lato from Coffea canephora: a New Mating Population in the Gibberella fujikuroi Species Complex

Auteurs : Pascale C. E. Lepoint ; Françoise T. J. Munaut ; Henri M. M. Maraite

Source :

RBID : PMC:1317314

Abstract

Gibberella xylarioides Heim & Saccas (presumed anamorph, Fusarium xylarioides Steyaert) is the causal agent of coffee wilt disease, an economically important tracheomycosis in Africa. In vitro crosses carried out with Congolese, Ugandan, and Tanzanian single-ascospore/conidial isolates originating from diseased Coffea canephora/excelsa demonstrated a heterothallic mating system, controlled by a single locus with two alleles, MAT-1 and MAT-2. Compatible isolates produced fertile perithecia within 2 to 8 weeks after mating. Mating type (MAT) was characterized by PCR with primer pairs previously developed for the Gibberella fujikuroi species complex (GFC) and for Fusarium oxysporum. All strains analyzed were morphologically identical and corresponded to Booth's description of the “female” F. xylarioides strain. Based on crossing results and MAT-2/translation elongation 1-α (tef) sequence data, G. xylarioides, as currently understood, is demonstrated to encompass at least three “groups”: G. xylarioides sensu strictu Ia, defined hitherto by two “historical” West African strains originating from the severe 1930s to 1950s epidemic (CBS 25852 and CBS 74979); G. xylarioides sensu strictu Ib, defined by two “historical” Central African lowland strains (DSMZ 62457 and ATCC 15664); and G. xylarioides sensu lato II, containing Congolese, Ugandan, and Tanzanian C. canephora/excelsa isolates. Infertility of crosses between the coffee wilt pathogen and known GFC mating populations demonstrates that G. xylarioides sensu lato constitutes a new biological species within the G. fujikuroi complex. MUCL 44532/MUCL 43887 and MUCL 35223/MUCL 44549 are proposed as G. xylarioides sensu lato II MAT-1/MAT-2 reference mating type tester strains.


Url:
DOI: 10.1128/AEM.71.12.8466-8471.2005
PubMed: 16332836
PubMed Central: 1317314

Links to Exploration step

PMC:1317314

Le document en format XML

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<italic>Gibberella xylarioides</italic>
Sensu Lato from
<italic>Coffea canephora</italic>
: a New Mating Population in the
<italic>Gibberella fujikuroi</italic>
Species Complex</title>
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Sensu Lato from
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: a New Mating Population in the
<italic>Gibberella fujikuroi</italic>
Species Complex</title>
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<p>
<italic>Gibberella xylarioides</italic>
Heim & Saccas (presumed anamorph,
<italic>Fusarium xylarioides</italic>
Steyaert) is the causal agent of coffee wilt disease, an economically important tracheomycosis in Africa. In vitro crosses carried out with Congolese, Ugandan, and Tanzanian single-ascospore/conidial isolates originating from diseased
<italic>Coffea canephora</italic>
/
<italic>excelsa</italic>
demonstrated a heterothallic mating system, controlled by a single locus with two alleles,
<italic>MAT-1</italic>
and
<italic>MAT-2</italic>
. Compatible isolates produced fertile perithecia within 2 to 8 weeks after mating. Mating type (
<italic>MAT</italic>
) was characterized by PCR with primer pairs previously developed for the
<italic>Gibberella fujikuroi</italic>
species complex (GFC) and for
<italic>Fusarium oxysporum</italic>
. All strains analyzed were morphologically identical and corresponded to Booth's description of the “female”
<italic>F. xylarioides</italic>
strain. Based on crossing results and
<italic>MAT-2</italic>
/translation elongation 1-α (
<italic>tef</italic>
) sequence data,
<italic>G. xylarioides</italic>
, as currently understood, is demonstrated to encompass at least three “groups”:
<italic>G. xylarioides</italic>
sensu strictu Ia, defined hitherto by two “historical” West African strains originating from the severe 1930s to 1950s epidemic (CBS 25852 and CBS 74979);
<italic>G. xylarioides</italic>
sensu strictu Ib, defined by two “historical” Central African lowland strains (DSMZ 62457 and ATCC 15664); and
<italic>G. xylarioides</italic>
sensu lato II, containing Congolese, Ugandan, and Tanzanian
<italic>C. canephora</italic>
/
<italic>excelsa</italic>
isolates. Infertility of crosses between the coffee wilt pathogen and known GFC mating populations demonstrates that
<italic>G. xylarioides</italic>
sensu lato constitutes a new biological species within the
<italic>G. fujikuroi</italic>
complex. MUCL 44532/MUCL 43887 and MUCL 35223/MUCL 44549 are proposed as
<italic>G. xylarioides</italic>
sensu lato II
<italic>MAT-1</italic>
/
<italic>MAT-2</italic>
reference mating type tester strains.</p>
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<journal-id journal-id-type="publisher-id">aem</journal-id>
<journal-title>Applied and Environmental Microbiology</journal-title>
<issn pub-type="ppub">0099-2240</issn>
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<publisher-name>American Society for Microbiology</publisher-name>
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<article-id pub-id-type="pmid">16332836</article-id>
<article-id pub-id-type="pmc">1317314</article-id>
<article-id pub-id-type="publisher-id">0193-05</article-id>
<article-id pub-id-type="doi">10.1128/AEM.71.12.8466-8471.2005</article-id>
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<subject>Mycology</subject>
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</article-categories>
<title-group>
<article-title>
<italic>Gibberella xylarioides</italic>
Sensu Lato from
<italic>Coffea canephora</italic>
: a New Mating Population in the
<italic>Gibberella fujikuroi</italic>
Species Complex</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Lepoint</surname>
<given-names>Pascale C. E.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
<xref ref-type="corresp" rid="cor1">*</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Munaut</surname>
<given-names>Françoise T. J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Maraite</surname>
<given-names>Henri M. M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
<xref ref-type="aff" rid="aff1">2</xref>
</contrib>
</contrib-group>
<aff id="aff1">Unité de Phytopathologie, Université catholique de Louvain, Croix du Sud 2/3, B-1348 Louvain-la-Neuve, Belgium,
<label>1</label>
Mycothèque de l'Université catholique de Louvain, Belgian Co-ordinated Collection of Micro-organisms, Unité de Microbiologie, Croix du Sud 3/6, B-1348 Louvain-la-Neuve, Belgium
<label>2</label>
</aff>
<author-notes>
<fn id="cor1">
<label>*</label>
<p>Corresponding author. Mailing address: Unité de Phytopathologie, Université catholique de Louvain, Croix du Sud 2/3, B-1348 Louvain-la-Neuve, Belgium. Phone: (32)10473751. Fax: (32)10478697. E-mail:
<email>lepoint@fymy.ucl.ac.be</email>
.</p>
</fn>
</author-notes>
<pub-date pub-type="ppub">
<month>12</month>
<year>2005</year>
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<volume>71</volume>
<issue>12</issue>
<fpage>8466</fpage>
<lpage>8471</lpage>
<history>
<date date-type="received">
<day>27</day>
<month>1</month>
<year>2005</year>
</date>
<date date-type="accepted">
<day>7</day>
<month>9</month>
<year>2005</year>
</date>
</history>
<copyright-statement>Copyright © 2005, American Society for Microbiology</copyright-statement>
<copyright-year>2005</copyright-year>
<abstract>
<p>
<italic>Gibberella xylarioides</italic>
Heim & Saccas (presumed anamorph,
<italic>Fusarium xylarioides</italic>
Steyaert) is the causal agent of coffee wilt disease, an economically important tracheomycosis in Africa. In vitro crosses carried out with Congolese, Ugandan, and Tanzanian single-ascospore/conidial isolates originating from diseased
<italic>Coffea canephora</italic>
/
<italic>excelsa</italic>
demonstrated a heterothallic mating system, controlled by a single locus with two alleles,
<italic>MAT-1</italic>
and
<italic>MAT-2</italic>
. Compatible isolates produced fertile perithecia within 2 to 8 weeks after mating. Mating type (
<italic>MAT</italic>
) was characterized by PCR with primer pairs previously developed for the
<italic>Gibberella fujikuroi</italic>
species complex (GFC) and for
<italic>Fusarium oxysporum</italic>
. All strains analyzed were morphologically identical and corresponded to Booth's description of the “female”
<italic>F. xylarioides</italic>
strain. Based on crossing results and
<italic>MAT-2</italic>
/translation elongation 1-α (
<italic>tef</italic>
) sequence data,
<italic>G. xylarioides</italic>
, as currently understood, is demonstrated to encompass at least three “groups”:
<italic>G. xylarioides</italic>
sensu strictu Ia, defined hitherto by two “historical” West African strains originating from the severe 1930s to 1950s epidemic (CBS 25852 and CBS 74979);
<italic>G. xylarioides</italic>
sensu strictu Ib, defined by two “historical” Central African lowland strains (DSMZ 62457 and ATCC 15664); and
<italic>G. xylarioides</italic>
sensu lato II, containing Congolese, Ugandan, and Tanzanian
<italic>C. canephora</italic>
/
<italic>excelsa</italic>
isolates. Infertility of crosses between the coffee wilt pathogen and known GFC mating populations demonstrates that
<italic>G. xylarioides</italic>
sensu lato constitutes a new biological species within the
<italic>G. fujikuroi</italic>
complex. MUCL 44532/MUCL 43887 and MUCL 35223/MUCL 44549 are proposed as
<italic>G. xylarioides</italic>
sensu lato II
<italic>MAT-1</italic>
/
<italic>MAT-2</italic>
reference mating type tester strains.</p>
</abstract>
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