{"id":1035,"date":"2018-10-08T12:48:01","date_gmt":"2018-10-08T10:48:01","guid":{"rendered":"http:\/\/cliniquedugazon.fr\/?p=1035"},"modified":"2019-01-09T09:35:03","modified_gmt":"2019-01-09T08:35:03","slug":"dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia","status":"publish","type":"post","link":"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/","title":{"rendered":"Dollar Spot : Sclerotinia Homoeocarpa n&rsquo;est plus : place \u00e0 Clarireedia"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-69e8b0ac93439\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e8b0ac93439\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Preambule\" >Pr\u00e9ambule<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Historique_de_la_classification_du_dollar_spot\" >Historique de la classification du dollar spot<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Une_nouvelle_etude_qui_met_fin_au_debat\" >Une nouvelle \u00e9tude qui met fin au d\u00e9bat<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Un_nouveau_genre_Clarireedia\" >Un nouveau genre : Clarireedia<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Description_des_nouvelles_especes\" >Description des nouvelles esp\u00e8ces<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Ce_quil_faut_retenir\" >Ce qu&rsquo;il faut retenir<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Conclusion_et_perspectives\" >Conclusion et perspectives<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/cliniquedugazon.fr\/index.php\/2018\/10\/08\/dollar-spot-sclerotinia-homoeocarpa-nest-plus-place-a-clarireedia\/#Bibliographie\" >Bibliographie<\/a><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"Preambule\"><\/span>Pr\u00e9ambule <i class=\"wp-svg-info-2 info-2\"><\/i><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<div class=\"avisclinique\">\n<p><span class=\"dropcap dropcap2\">C<\/span>et article est bas\u00e9 sur la publication parue sur le journal \u00ab\u00a0<a href=\"https:\/\/www.sciencedirect.com\/journal\/fungal-biology\"><em><strong>Fungal Biology<\/strong><\/em><\/a>\u00a0\u00bb en Ao\u00fbt 2018 issue des travaux de l\u2019<a href=\"https:\/\/www.usda.gov\/\">USDA<\/a>, l&rsquo;universit\u00e9 de <a href=\"https:\/\/www.rutgers.edu\/\">Rutgers<\/a>, de <a href=\"https:\/\/www.ncsu.edu\/\">Caroline du Nord<\/a> et de l\u2019<a href=\"https:\/\/www.ohio.edu\/\">Ohio<\/a>. Elle est consultable gratuitement en anglais en cliquant sur le lien suivant :<\/p>\n<div class=\"alertbox\"><a href=\"https:\/\/doi.org\/10.1016\/j.funbio.2018.04.004\"><strong>Salgado-Salazar et al., 2018,<\/strong> Clarireedia: A new fungal genus comprising four pathogenic species responsible for dollar spot disease of turfgrass, <em>Fungal Biology, <\/em>122 <strong>(8)<\/strong>, 761-773<\/a><br \/>\nArticle publi\u00e9 par l&rsquo;\u00e9diteur\u00a0<a href=\"https:\/\/doi.org\/10.1016\/j.funbio.2018.04.004\">Science Direct (Elsevier)<\/a>\u00a0sous licence\u00a0<a href=\"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/\"><span class=\"cc-license-identifier\">CC BY-NC-ND 4.0<\/span><\/a><\/div>\n<p>Le magazine \u00ab\u00a0Golf Course Management\u00a0\u00bb y a \u00e9galement consacr\u00e9 un article en anglais consultable sur le <a href=\"https:\/\/www.gcmonline.com\/news\/dollar-spot-turf\">lien suivant<\/a>.<\/p>\n<\/div>\n<h1><span class=\"ez-toc-section\" id=\"Historique_de_la_classification_du_dollar_spot\"><\/span>Historique de la classification du <em>dollar spot<\/em><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>Le premier rapport concernant dollar spot date de 1927<sup>1<\/sup>. A l\u2019\u00e9poque, <em>John Monteith<\/em> le d\u00e9crit alors comme le \u00ab\u00a0<em>petit brown patch<\/em>\u00a0\u00bb en raison des l\u00e9sions foliaires (voir figure 2) observ\u00e9es similaires aux \u00ab\u00a0br\u00fblures transversales\u00a0\u00bb du <em>brown patch<\/em> mais une formation de t\u00e2ches circulaires ne d\u00e9passant pas la taille d\u2019une pi\u00e8ce d\u2019un dollar sur les gazons coup\u00e9s \u00e0 ras (voir figure 3). Le terme \u00ab\u00a0<em>petit brown patch<\/em>\u00a0\u00bb fut remplac\u00e9 par en 1932 par \u00ab\u00a0<em>dollar spot<\/em>\u00a0\u00bb pour \u00e9viter les confusions avec le \u00ab\u00a0<em>large brown patch<\/em>\u00a0\u00bb caus\u00e9 par <em>Rhizoctonia solani<\/em><sup>2<\/sup>(voir figure 1).<\/p>\n<figure id=\"attachment_1046\" aria-describedby=\"caption-attachment-1046\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cliniquedugazon.fr\/?attachment_id=1046\"><img loading=\"lazy\" decoding=\"async\" class=\" td-modal-image wp-image-1046 size-full\" src=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/Monteith-1927-1000.jpg\" alt=\"Premier article sur dollar spot par J. Monteith\" width=\"1000\" height=\"649\" srcset=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/Monteith-1927-1000.jpg 1000w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/Monteith-1927-1000-300x195.jpg 300w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/Monteith-1927-1000-768x498.jpg 768w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/Monteith-1927-1000-696x452.jpg 696w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/Monteith-1927-1000-647x420.jpg 647w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><figcaption id=\"caption-attachment-1046\" class=\"wp-caption-text\">Figure 1 : Extrait du premier article sur dollar spot : photographie du pathog\u00e8ne par J. Monteith. (Source : <a href=\"http:\/\/archive.lib.msu.edu\/tic\/ngktc\/article\/1927jun7.pdf\">Monteith, 1932<\/a>) &#8211; <strong>Licence :<\/strong> \u00ab\u00a0<a href=\"http:\/\/archive.lib.msu.edu\/tic\/ngktc\/article\/1927jun7.pdf\">Can You Identify Brown-Patch?<\/a>\u00a0\u00bb par les\u00a0<a href=\"https:\/\/lib.msu.edu\/\">archives de l&rsquo;universit\u00e9 du Michigan<\/a>.<\/figcaption><\/figure>\n<p>En 1935, F.T. Bennett caract\u00e9risa d\u2019ailleurs le champignon pathog\u00e8ne causant <em>dollar spot<\/em> comme une nouvelle esp\u00e8ce\u00a0: <em>Rhizoctonia monteithiana<\/em> en raison du nom de son premier observateur<sup>3<\/sup>. Or, ce nouveau nom ne fut jamais valid\u00e9 officiellement en raison de sa non-conformit\u00e9 avec les nouvelles nomenclatures de l\u2019\u00e9poque. En 1937, Bennett proposa un nom valide pour le champignon suite \u00e0 de nouvelles observations, retirant sa premi\u00e8re proposition de nomenclature. C\u2019est alors que le champignon de la famille des ascomyc\u00e8tes prend le nom utilis\u00e9 jusqu\u2019\u00e0 nos jours\u00a0: \u00ab\u00a0<em>Sclerotinia homoeocarpa<\/em>\u00a0\u00bb<sup>4<\/sup>. En effet, Bennett remarque que les structures desquelles les sporophores \u00e9mergent ressemblent \u00e0 des aggr\u00e9gats de microscl\u00e9rotes et classifie le champignon dans le genre <em>Sclerotinia<\/em> (<em>Sclerotiniaceae<\/em>).<\/p>\n<figure id=\"attachment_1049\" aria-describedby=\"caption-attachment-1049\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cliniquedugazon.fr\/?attachment_id=1049\"><img loading=\"lazy\" decoding=\"async\" class=\" td-modal-image wp-image-1049 size-full\" src=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-lesions-850.jpg\" alt=\"L\u00e9sions foliaires du dollar spot\" width=\"800\" height=\"632\" srcset=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-lesions-850.jpg 800w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-lesions-850-300x237.jpg 300w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-lesions-850-768x607.jpg 768w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-lesions-850-696x550.jpg 696w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-lesions-850-532x420.jpg 532w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption id=\"caption-attachment-1049\" class=\"wp-caption-text\">Figure 2 : L\u00e9sions foliaires caract\u00e9ristiques du dollar spot en br\u00fblures perpendiculaires au limbe. Photographie : R. Giraud.<\/figcaption><\/figure>\n<p>En 1945, H. Whetzel revoit la taxonomie de la famille des <em>Sclerotiniaceae<\/em> et restreint le genre <em>Sclerotinia<\/em> aux champignons produisant des apoth\u00e9cies provenant de scl\u00e9rotes tubulaires, ce qui n\u2019est pas le cas de <em>Sclerotinia homoeocarpa<\/em><sup>5<\/sup>. Ce dernier produit en effet un stroma plat et non pas de vrais scl\u00e9rotes. Whetzel conclue en raison de cette caract\u00e9ristique morphologique que <em>S. homoeocarpa<\/em> ressemblerait plus aux esp\u00e8ces comme <em>Rutstroemia<\/em> ou <em>Lambertella<\/em>, organismes class\u00e9s en 1997 dans une nouvelle famille\u00a0: les <em>Rutstroemiaceae<\/em><sup>5<\/sup>. Whetzel proposa en 1946 de reclasser <em>S. homoeocarpa<\/em> mais ne le fit jamais formellement<sup>6<\/sup>. Ainsi, le champignon pathog\u00e8ne \u00e0 l\u2019origine de <em>dollar spot<\/em> garda un nom g\u00e9n\u00e9rique taxonomiquement incorrect, mais officiel du point de vue de la nomenclature.<\/p>\n<figure id=\"attachment_1048\" aria-describedby=\"caption-attachment-1048\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cliniquedugazon.fr\/?attachment_id=1048\"><img loading=\"lazy\" decoding=\"async\" class=\" td-modal-image wp-image-1048\" src=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920.jpg\" alt=\"Dollar spot sur green de golf\" width=\"800\" height=\"600\" srcset=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920.jpg 1920w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-300x225.jpg 300w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-768x576.jpg 768w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-1024x768.jpg 1024w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-80x60.jpg 80w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-265x198.jpg 265w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-696x522.jpg 696w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-1068x801.jpg 1068w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/dollar-spot-1920-560x420.jpg 560w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption id=\"caption-attachment-1048\" class=\"wp-caption-text\">Figure 3 : Sympt\u00f4mes du dollar spot sur green de golf. Photographie : R. Giraud.<\/figcaption><\/figure>\n<p><em> S. homoeocarpa <\/em>ne produit que tr\u00e8s rarement de spores sexuelles, il ne se reproduit que par des hyphes st\u00e9riles ou des stromas<sup>7<\/sup>. Depuis les premi\u00e8res observations de Bennett, seule une \u00e9tude de 1970 relate l\u2019observation de souches produisant des apoth\u00e9cies mais celles-ci sont st\u00e9riles<sup>8<\/sup>. En 1973, Jackson isole et observe une souche provenant du Royaume Uni capable de produire des ascospores (spores sexuelles), avec des caract\u00e9ristiques proches de la souche d\u00e9crite par Bennett en 1937<sup>9<\/sup>. Jackson compare la souche \u00e0 l\u2019esp\u00e8ce <em>Rustroemia<\/em> mais n\u2019ose pas reclasser <em>S. homoeocarpa<\/em> du fait du peu d\u2019unanimit\u00e9 dont le genre <em>Rustroemia<\/em> fait preuve aux yeux des taxonomistes<sup>10<\/sup>.<\/p>\n<p>Depuis 1973 jusqu\u2019\u00e0 l\u2019apparition des technologies bas\u00e9es sur l\u2019ADN dans les ann\u00e9es 1990 et bien que de nombreux scientifiques soient d\u2019accord sur le fait que <em>S. homoeocarpa<\/em> n\u2019est pas un vrai <em>Sclerotinia<\/em>, de longs d\u00e9bats ont lieu entre les taxonomistes concernant la nomenclature exacte du champignon<sup>7<\/sup>. De nombreuses esp\u00e8ces alternatives sont d\u2019ailleurs propos\u00e9es (<em>Lanzia,\u00a0Lambertella,\u00a0Moellerodiscus,\u00a0Poculum\u00a0<\/em>ou<em>\u00a0Rutstroemia<\/em>) sans d\u00e9cision officielle sur la classification<sup>5,11-13<\/sup>.<\/p>\n<p>Les ann\u00e9es 90 marquent le d\u00e9but d\u2019une nouvelle aire technologique avec l\u2019ADNr permettant de r\u00e9aliser des analyses phylog\u00e9n\u00e9tiques. Diff\u00e9rents travaux sont alors effectu\u00e9s sur <em>dollar spot<\/em> mais les r\u00e9sultats sont contradictoires du fait d\u2019une variabilit\u00e9 g\u00e9n\u00e9tique \u00e9lev\u00e9e et du faible nombre de souches utilis\u00e9es. Plusieurs \u00e9vidences montrent tout de m\u00eame l\u2019appartenance probable du champignon au genre <em>Rustroemia<\/em><sup>14-15<\/sup>. La reclassification du champignon est tout de m\u00eame d\u00e9f\u00e9r\u00e9e pour la cinqui\u00e8me fois<sup>13<\/sup>.<\/p>\n<h1><span class=\"ez-toc-section\" id=\"Une_nouvelle_etude_qui_met_fin_au_debat\"><\/span>Une nouvelle \u00e9tude qui met fin au d\u00e9bat<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>R\u00e9cemment, des chercheurs de l\u2019USDA, universit\u00e9 de Rutgers, de Caroline du Nord et de l\u2019Ohio se sont pench\u00e9s pour r\u00e9gler la probl\u00e9matique. Avec plus de 4000 souches de champignons pathog\u00e8nes causant les sympt\u00f4mes du <em>dollar spot<\/em> sur diff\u00e9rentes plantes h\u00f4tes \u00e0 travers le monde entier, le groupe de recherche a \u00e9tudi\u00e9 g\u00e9n\u00e9tiquement et morphologiquement les caract\u00e9ristiques de ces champignons<sup>7<\/sup>. Les informations g\u00e9n\u00e9tiques ont fait l\u2019objet d\u2019une analyse phylog\u00e9n\u00e9tique, un outil utilis\u00e9 pour d\u00e9terminer les liens g\u00e9n\u00e9tiques entre les organismes et construire des arbres phylog\u00e9n\u00e9tiques. Cette derni\u00e8re analyse montre qu\u2019il n\u2019existe pas une mais 4 esp\u00e8ces diff\u00e9rentes de champignon \u00e0 l\u2019origine de <em>dollar spot<\/em> et que ces champignons n\u2019appartiennent \u00e0 aucun genre connu d\u00e9crit jusqu\u2019\u00e0 pr\u00e9sent<sup>7<\/sup>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Un_nouveau_genre_Clarireedia\"><\/span>Un nouveau genre : <em>Clarireedia<\/em><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Un nouveau genre, appel\u00e9 \u00ab\u00a0<em>Clarireedia<\/em>\u00a0\u00bb a donc \u00e9t\u00e9 cr\u00e9\u00e9 pour classifier ces champignons pathog\u00e8nes<sup>7<\/sup>. Le nouveau nom est un hommage \u00e0 C. Reed Funk, un scientifique renomm\u00e9 pour ses travaux dans l\u2019am\u00e9lioration g\u00e9n\u00e9tique des vari\u00e9t\u00e9s de gazon en ce qui concerne la r\u00e9sistance au dollar spot (\u00ab\u00a0<em>Clarus<\/em>\u00a0\u00bb signifie \u00ab\u00a0<em>connu<\/em>\u00a0\u00bb en latin et \u00ab\u00a0<em>reedia<\/em>\u00a0\u00bb fait r\u00e9f\u00e9rence \u00e0 \u00ab\u00a0<em>Reed<\/em>\u00a0\u00bb). 4 esp\u00e8ces de dollar spot sont maintenant d\u00e9crites au sein du genre <em>Clarireedia<\/em>\u00a0(voir figure 4) :<\/p>\n<ul class=\"td-arrow-list\">\n<li><em>C. jacksonii<\/em><\/li>\n<li><em>C. monteithiana<\/em><\/li>\n<li><em>C. homoeocarpa<\/em><\/li>\n<li><em>C. bennettii<\/em><\/li>\n<\/ul>\n<p>Du fait de la quasi absence de structures de reproduction (asques, ascospores bien que certaines esp\u00e8ces d\u00e9veloppent des apoth\u00e9cies st\u00e9riles) ou de caract\u00e9ristiques morphologiques distinctes, la diff\u00e9renciation ne peut se faire que par le biais d&rsquo;analyses phylog\u00e9n\u00e9tiques mol\u00e9culaires<sup>7<\/sup>.<\/p>\n<figure id=\"attachment_1051\" aria-describedby=\"caption-attachment-1051\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cliniquedugazon.fr\/?attachment_id=1051\"><img loading=\"lazy\" decoding=\"async\" class=\" td-modal-image wp-image-1051 size-full\" src=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000.png\" alt=\"Arbre Clarireedia \" width=\"1000\" height=\"864\" srcset=\"https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000.png 1000w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000-300x259.png 300w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000-768x664.png 768w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000-534x462.png 534w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000-696x601.png 696w, https:\/\/cliniquedugazon.fr\/wp-content\/uploads\/2018\/10\/arbre-g\u00e9n\u00e9tique-1000-486x420.png 486w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><figcaption id=\"caption-attachment-1051\" class=\"wp-caption-text\">Figure 4 : Arbre g\u00e9n\u00e9tique et classification des nouvelles esp\u00e8ces causant dollar spot. Sch\u00e9ma : R. Giraud<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Description_des_nouvelles_especes\"><\/span>Description des nouvelles esp\u00e8ces<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><em>Clarireedia jacksonii : l&rsquo;esp\u00e8ce majoritaire sur les gramin\u00e9es de saison froide<\/em><\/h3>\n<p><em>Clarireedia jacksonii<\/em> a \u00e9t\u00e9 nomm\u00e9 en r\u00e9f\u00e9rence \u00e0 Noel Jackson, un pathologiste ayant travaill\u00e9 sur <em>dollar spot<\/em> dans les ann\u00e9es 70. Sa distribution est mondiale et ne touche que les gramin\u00e9es de saison froide (agrostides, f\u00e9tuques rouges, p\u00e2turin des pr\u00e9s et raygrass anglais)<sup>7<\/sup>. Cette esp\u00e8ce est capable de produire des apoth\u00e9cies toutefois st\u00e9riles en conditions in-vitro sur milieu g\u00e9los\u00e9.<\/p>\n<div class=\"alertbox\">Sous nos latitudes, c&rsquo;est donc l&rsquo;esp\u00e8ce qui provoque <em>dollar spot<\/em> et sa d\u00e9nomination vient remplacer celle de <em>Sclerotinia homoeocarpa<\/em>.<\/div>\n<h3><em>Clarireedia monteithiana : l&rsquo;esp\u00e8ce majoritaire sur les gramin\u00e9es de saison chaude<\/em><\/h3>\n<p><em>Clarireedia monteithiana<\/em>, a \u00e9t\u00e9 nomm\u00e9 en r\u00e9f\u00e9rence \u00e0 John Monteith, le scientifique qui d\u00e9couvrit dollar spot en 1927. L\u2019esp\u00e8ce est distribu\u00e9e dans le monde entier et n\u2019a \u00e9t\u00e9 trouv\u00e9e que sur les gramin\u00e9es de saison chaude comme les chiendents ou paspalums<sup>7<\/sup>.<\/p>\n<p>Ces deux premi\u00e8res esp\u00e8ces sont responsables de la majorit\u00e9 des \u00e9pid\u00e9mies de dollar spot rencontr\u00e9es \u00e0 travers le monde (71% des souches \u00e9tudi\u00e9es).<\/p>\n<h3><em>Clarireedia homoeocarpa<\/em><\/h3>\n<p><em>Clarireedia homoeocarpa<\/em>, bien moins r\u00e9pandu. Cette esp\u00e8ce n\u2019affecte que les f\u00e9tuques rouges et n\u2019a \u00e9t\u00e9 isol\u00e9e qu\u2019au Royaume Uni. Probablement le <em>Rhizoctonia monteithiana <\/em>d\u00e9crit par Bennett en 1935<sup>3<\/sup>.C&rsquo;est la seconde esp\u00e8ce o\u00f9 des apoth\u00e9cies ont \u00e9t\u00e9 observ\u00e9es (voir figure 5).<\/p>\n<figure style=\"width: 533px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/ars.els-cdn.com\/content\/image\/1-s2.0-S1878614618300655-gr5.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" td-modal-image\" src=\"https:\/\/ars.els-cdn.com\/content\/image\/1-s2.0-S1878614618300655-gr5.jpg\" alt=\"Apoth\u00e9cies Clarireedia Homoeocarpa\" width=\"533\" height=\"490\" \/><\/a><figcaption class=\"wp-caption-text\">Figure 5 : Clarireedia Homoeocarpa : la seule esp\u00e8ce ou des apoth\u00e9cies ont \u00e9t\u00e9 observ\u00e9es. Elles restent cependant st\u00e9riles. (Source : <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1878614618300655?via%3Dihub#bib18\">Salgado-Salazar et al., 2018<\/a>). <strong>Licence\u00a0:<\/strong> \u00ab\u00a0<a href=\"https:\/\/ars.els-cdn.com\/content\/image\/1-s2.0-S1878614618300655-gr5.jpg\"><em>Clarireedia homoeocarpa<\/em>\u00a0neotype material.<\/a>\u00a0\u00bb par l&rsquo;\u00e9diteur\u00a0<a href=\"https:\/\/doi.org\/10.1016\/j.funbio.2018.04.004\">Science Direct<\/a>\u00a0sous licence\u00a0<a href=\"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/\"><span class=\"cc-license-identifier\">CC BY-NC-ND 4.0<\/span><\/a><\/figcaption><\/figure>\n<h3><em>Clarireedia bennettii<\/em><\/h3>\n<p><em>Clarireedia bennettii <\/em>a \u00e9t\u00e9 nomm\u00e9 en r\u00e9f\u00e9rence \u00e0 F. T. Bennett qui fut le premier \u00e0 d\u00e9crire le pathog\u00e8ne \u00e0 l\u2019origine de <em>dollar spot<\/em><sup>4<\/sup>. Cette derni\u00e8re esp\u00e8ce est d\u00e9crite par Bennett en 1937<sup>4<\/sup> et fut isol\u00e9e d\u2019une esp\u00e8ce de gazon inconnue. On la retrouve sur les d\u00e9bris de v\u00e9g\u00e9taux morts au Royaume Uni, aux Pays-Bas, et aux USA<sup>7<\/sup>.<\/p>\n<div class=\"alertbox\">\n<h1><span class=\"ez-toc-section\" id=\"Ce_quil_faut_retenir\"><\/span>Ce qu&rsquo;il faut retenir <i class=\"wp-svg-info-2 info-2\"><\/i><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<ul class=\"td-arrow-list\">\n<li>Le dollar spot a \u00e9t\u00e9 d\u00e9couvert en 1927 et le champignon \u00e0 l&rsquo;origine des sympt\u00f4mes observ\u00e9s a \u00e9t\u00e9 d\u00e9sign\u00e9 incorrectement <em>Sclerotinia homoeocarpa<\/em> depuis 1937 jusqu&rsquo;\u00e0 2018.<\/li>\n<li>A travers le temps, de nombreux chercheurs ont \u00e9mis l&rsquo;hypoth\u00e8se de la non appartenance du pathog\u00e8ne au genre <em>Sclerotinia<\/em>. C&rsquo;est seulement aujourd&rsquo;hui \u00e0 l&rsquo;aide des nouvelles techniques mol\u00e9culaires bas\u00e9es sur l&rsquo;analyse phylog\u00e9n\u00e9tique que les scientifiques ont pu rattacher le champignon pathog\u00e8ne \u00e0 un nouveau genre :\u00a0<em>Clarireedia.<\/em><\/li>\n<li>4 esp\u00e8ces diff\u00e9rentes de <em>Clarireedia<\/em> ont \u00e9t\u00e9 identifi\u00e9es lors d&rsquo;une \u00e9tude publi\u00e9e en Ao\u00fbt 2018. 4 champignons et non pas un seul sont \u00e0 l&rsquo;origine du <em>dollar spot<\/em>.<\/li>\n<li>Sous nos latitudes, <em>Clarireedia jacksonii<\/em> est responsable de\u00a0la maladie. Le nom \u00ab\u00a0<em>Sclerotinia homoeocarpa<\/em>\u00a0\u00bb n&rsquo;est donc plus d&rsquo;usage et remplac\u00e9 par <em>Clarireedia jacksonii<\/em>, prononc\u00e9 \u00ab\u00a0<em>klariridia jakssoni<\/em>\u00a0\u00bb (<a href=\"https:\/\/translate.google.fr\/m\/translate?hl=fr#view=home&amp;op=translate&amp;sl=fr&amp;tl=en&amp;text=klariridia%20jaksoni\">cliquez ici pour acc\u00e9der \u00e0 la page de google translate qui prononce plut\u00f4t bien le nouveau nom du pathog\u00e8ne, il suffit de cliquer sur le haut parleur sur la gauche<\/a>).<\/li>\n<\/ul>\n<\/div>\n<h1><span class=\"ez-toc-section\" id=\"Conclusion_et_perspectives\"><\/span>Conclusion et perspectives<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>Cette nouvelle classification des champignons \u00e0 l\u2019origine de <em>dollar spot<\/em> marque une avanc\u00e9e significative apr\u00e8s plus de 80 ans de travaux et d\u00e9bats. De plus, la d\u00e9couverte de 4 esp\u00e8ces diff\u00e9rentes (et probablement d\u2019autres localement) souligne la forte diversit\u00e9 biologique pr\u00e9sente dans ce genre.<\/p>\n<p>Cette d\u00e9couverte majeure permettra d\u00e9sormais d\u2019\u00e9tudier l\u2019influence de cette diversit\u00e9 sur les m\u00e9thodes de contr\u00f4les (m\u00e9thodes culturales, fongicides, biocontr\u00f4le) et de trouver peut-\u00eatre des solutions mieux adapt\u00e9es et plus efficaces en fonction de chaque esp\u00e8ce.<\/p>\n<div class=\"biblio\">\n<h1><span class=\"ez-toc-section\" id=\"Bibliographie\"><\/span><i class=\"wp-svg-book book\"><\/i>Bibliographie<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<ol>\n<li><strong>Monteith, J. (1927).<\/strong> Can You Identify Brown-Patch? <em>Natl. Greenkeep.<\/em> <strong>6,<\/strong> 7\u201311<\/li>\n<li><strong>Monteith, J. &amp; Dahl, A. S. (1932).<\/strong> Turf Diseases and Their Control. <em>Bull. U. S. Golf Assoc. Green Sect.<\/em> 87\u201389 <a href=\"http:\/\/gsrpdf.lib.msu.edu\/ticpdf.py?file=\/1930s\/1932\/320887A.pdf\">http:\/\/gsrpdf.lib.msu.edu\/ticpdf.py?file=\/1930s\/1932\/320887A.pdf<\/a><\/li>\n<li><strong>Bennett, F. T. (1935).<\/strong> Rhizoctonia diseases of turf. <em>Gardeners Chron<\/em> <strong>3,<\/strong><\/li>\n<li><strong>Bennett, F. T. (1937).<\/strong> DOLLARSPOT DISEASE OF TURF AND ITS CAUSAL ORGANISM, SCLEROTINIA HOMOEOCARPA N.SP. <em>Annals of Applied Biology<\/em> <strong>24,<\/strong> 236\u2013257 <a href=\"https:\/\/doi.org\/10.1111\/j.1744-7348.1937.tb05032.x\">https:\/\/doi.org\/10.1111\/j.1744-7348.1937.tb05032.x<\/a><\/li>\n<li><strong>Whetzel, H. H. (1945).<\/strong> A Synopsis of the Genera and Species of the Sclerotiniaceae, A Family of Stromatic Inoperculate Discomycetes. <em>Mycologia<\/em> <strong>37,<\/strong> 648\u2013714 <a href=\"https:\/\/doi.org\/10.1080\/00275514.1945.12024025\">https:\/\/doi.org\/10.1080\/00275514.1945.12024025<\/a><\/li>\n<li><strong>Whetzel, H. H. (1946)<\/strong>. The cypericolous and juncicolous species of Sclerotinia. <em>Farlowia<\/em> <strong>2,<\/strong> 385\u2013437<\/li>\n<li><strong>Salgado-Salazar, C. <em>et al.<\/em> (2018).<\/strong> Clarireedia: A new fungal genus comprising four pathogenic species responsible for dollar spot disease of turfgrass. <em>Fungal Biology<\/em> <strong>122,<\/strong> 761\u2013773 <a href=\"https:\/\/doi.org\/10.1016\/j.funbio.2018.04.004\">https:\/\/doi.org\/10.1016\/j.funbio.2018.04.004<\/a><\/li>\n<li><strong>Fenstermacher, J. M. (1970).<\/strong> Variation within Sclerotinia Homoeocarpa F. T. Bennett. <em>Universit\u00e9 du Rhode Island<\/em><\/li>\n<li><strong>Roberts, E. C. &amp; Jackson, N. (American Society of Agronomy, Crop Science Society of America, 1974).<\/strong> Apothecial production of F.T. Bennett. in <em>ACSESS publications<\/em> <a href=\"https:\/\/doi.org\/10.2135\/1974.proc2ndintlturfgrass.c51\">https:\/\/doi.org\/10.2135\/1974.proc2ndintlturfgrass.c51<\/a><\/li>\n<li><strong>Dumont, K. P. (1971).<\/strong> Sclerotineaceae II. Lambertella. Memoir. <em>Bot. Gard.<\/em> <strong>22,<\/strong> 1\u2013178<\/li>\n<li><strong>Kohn, L. M. (1979).<\/strong> Delimitation of the Economically Important Plant Pathogenic Sclerotinia Species. <em>Phytopathology<\/em> <strong>69,<\/strong> 881 <a href=\"https:\/\/doi.org\/10.1094\/Phyto-69-881\">https:\/\/doi.org\/10.1094\/Phyto-69-881<\/a><\/li>\n<li><strong>Kohn, L. M. (1979).<\/strong> A monographic revision of the genus Sclerotinia. <em>Mycotaxon<\/em> <strong>9,<\/strong> 365\u2013444<\/li>\n<li><strong>Holst-Jensen, A., Kohn, L. M. &amp; Schumacher, T. (1997).<\/strong> Nuclear rDNA Phylogeny of the Sclerotiniaceae. <em>Mycologia<\/em> <strong>89,<\/strong> 885 <a href=\"https:\/\/doi.org\/10.2307\/3761109\">https:\/\/doi.org\/10.2307\/3761109<\/a><\/li>\n<li><strong>Novak, L. A. &amp; Kohn, L. M. (1991).<\/strong> Electrophoretic and Immunological Comparisons of Developmentally Regulated Proteins in Members of the Sclerotiniaceae and Other Sclerotial Fungi. <em>Appl Environ Microbiol<\/em> <strong>57,<\/strong> 525\u2013534<\/li>\n<li><strong>Carbone, I. &amp; Kohn, L. M. (1993).<\/strong> Ribosomal DNA Sequence Divergence within Internal Transcribed Spacer 1 of the Sclerotiniaceae. <em>Mycologia<\/em> <strong>85,<\/strong> 415\u2013427 <a href=\"https:\/\/carbonelab.org\/system\/files\/Carbone_and_Kohn_1993.pdf\">https:\/\/carbonelab.org\/system\/files\/Carbone_and_Kohn_1993.pdf<\/a><\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pr\u00e9ambule Cet article est bas\u00e9 sur la publication parue sur le journal \u00ab\u00a0Fungal Biology\u00a0\u00bb en Ao\u00fbt 2018 issue des travaux de l\u2019USDA, l&rsquo;universit\u00e9 de Rutgers, de Caroline du Nord et de l\u2019Ohio. Elle est consultable gratuitement en anglais en cliquant sur le lien suivant : Salgado-Salazar et al., 2018, Clarireedia: A new fungal genus comprising [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1069,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[13],"tags":[],"class_list":{"0":"post-1035","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-maladies"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dollar Spot : Sclerotinia Homoeocarpa n&#039;est plus : place \u00e0 Clarireedia - Clinique du Gazon<\/title>\n<meta name=\"description\" content=\"Evolution de la nomenclature du champignon \u00e0 l&#039;origine du dollar spot. 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