A new species of Pythium isolated from burgundian vineyards and its antagonism towards Botrytis cinerea, the causative agent of the grey mould disease.
Identifieur interne : 002371 ( Main/Exploration ); précédent : 002370; suivant : 002372A new species of Pythium isolated from burgundian vineyards and its antagonism towards Botrytis cinerea, the causative agent of the grey mould disease.
Auteurs : Bernard Paul [France]Source :
- FEMS microbiology letters [ 0378-1097 ] ; 2004.
Descripteurs français
- KwdFr :
- ADN des plantes (génétique), ADN intergénique (composition chimique), ADN intergénique (génétique), Botrytis (pathogénicité), Données de séquences moléculaires (MeSH), Feuilles de plante (microbiologie), Maladies des plantes (microbiologie), Pythium (génétique), Pythium (isolement et purification), Réaction de polymérisation en chaîne (MeSH), Séquence d'acides aminés (MeSH), Séquence nucléotidique (MeSH), Vin (microbiologie).
- MESH :
- composition chimique : ADN intergénique.
- génétique : ADN des plantes, ADN intergénique, Pythium.
- isolement et purification : Pythium.
- microbiologie : Feuilles de plante, Maladies des plantes, Vin.
- pathogénicité : Botrytis.
- Données de séquences moléculaires, Réaction de polymérisation en chaîne, Séquence d'acides aminés, Séquence nucléotidique.
English descriptors
- KwdEn :
- Amino Acid Sequence (MeSH), Base Sequence (MeSH), Botrytis (pathogenicity), DNA, Intergenic (chemistry), DNA, Intergenic (genetics), DNA, Plant (genetics), Molecular Sequence Data (MeSH), Plant Diseases (microbiology), Plant Leaves (microbiology), Polymerase Chain Reaction (MeSH), Pythium (genetics), Pythium (isolation & purification), Wine (microbiology).
- MESH :
- chemical , chemistry : DNA, Intergenic.
- chemical , genetics : DNA, Intergenic, DNA, Plant.
- genetics : Pythium.
- isolation & purification : Pythium.
- microbiology : Plant Diseases, Plant Leaves, Wine.
- pathogenicity : Botrytis.
- Amino Acid Sequence, Base Sequence, Molecular Sequence Data, Polymerase Chain Reaction.
Abstract
During the course of an investigation on the pythiaceous fungi occurring in burgundian vineyards, three isolates of Pythium were found, all of which were characterised by spherical to lemoniform, proliferating sporangia. Only one out of these three isolates produced sexual characters (S-12) after prolonged incubation, but their asexual structures, temperature growth relationship and molecular characteristics were identical. Saprolegnia-type internal proliferation of the sporangia, and Phytophthora-type lemoniform, papillate sporangia were characteristic of all the three isolates. The type specimen is S-12 which is a medium slow growing saprophyte. The sequence of its ITS region of the rDNA shows a close relationship with the genus Phytophthora. Morphological and molecular characteristics of this isolate justifies its description as a new species: Pythium citrinum. When grown together with Botrytis cinerea, the causal agent of the grey mould disease of the grapevine, this new species shows a pronounced antagonism and suppresses its growth. This new species is very close to P. montanum, a recently described fungus and constitutes a "border species" linking the genera Pythium and Phytophthora. Morphological features of this new species, its antagonism with B. cinerea, the sequences of the ITS region of its nuclear ribosomal DNA, and its comparison with related species are discussed.
DOI: 10.1016/j.femsle.2004.03.039
PubMed: 15135532
Affiliations:
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Pythium were found, all of which were characterised by spherical to lemoniform, proliferating sporangia. Only one out of these three isolates produced sexual characters (S-12) after prolonged incubation, but their asexual structures, temperature growth relationship and molecular characteristics were identical. Saprolegnia-type internal proliferation of the sporangia, and Phytophthora-type lemoniform, papillate sporangia were characteristic of all the three isolates. The type specimen is S-12 which is a medium slow growing saprophyte. The sequence of its ITS region of the rDNA shows a close relationship with the genus Phytophthora. Morphological and molecular characteristics of this isolate justifies its description as a new species: Pythium citrinum. When grown together with Botrytis cinerea, the causal agent of the grey mould disease of the grapevine, this new species shows a pronounced antagonism and suppresses its growth. This new species is very close to P. montanum, a recently described fungus and constitutes a "border species" linking the genera Pythium and Phytophthora. Morphological features of this new species, its antagonism with B. cinerea, the sequences of the ITS region of its nuclear ribosomal DNA, and its comparison with related species are discussed.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">15135532</PMID><DateCompleted><Year>2004</Year><Month>07</Month><Day>19</Day></DateCompleted><DateRevised><Year>2004</Year><Month>05</Month><Day>11</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0378-1097</ISSN><JournalIssue CitedMedium="Print"><Volume>234</Volume><Issue>2</Issue><PubDate><Year>2004</Year><Month>May</Month><Day>15</Day></PubDate></JournalIssue><Title>FEMS microbiology letters</Title><ISOAbbreviation>FEMS Microbiol Lett</ISOAbbreviation></Journal><ArticleTitle>A new species of Pythium isolated from burgundian vineyards and its antagonism towards Botrytis cinerea, the causative agent of the grey mould disease.</ArticleTitle><Pagination><MedlinePgn>269-74</MedlinePgn></Pagination><Abstract><AbstractText>During the course of an investigation on the pythiaceous fungi occurring in burgundian vineyards, three isolates of Pythium were found, all of which were characterised by spherical to lemoniform, proliferating sporangia. 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