{"id":1076,"date":"2018-04-12T11:25:59","date_gmt":"2018-04-12T17:25:59","guid":{"rendered":"http:\/\/blog.minnesotaseasons.com\/?p=1076"},"modified":"2020-02-18T06:00:42","modified_gmt":"2020-02-18T12:00:42","slug":"pst-pseudomonas-syringae-pv-tagetis","status":"publish","type":"post","link":"https:\/\/blog.minnesotaseasons.com\/?p=1076","title":{"rendered":"Pst <em>(Pseudomonas syringae<\/em> pv. <em>tagetis)<\/em>"},"content":{"rendered":"<div id=\"attachment_1077\" style=\"width: 583px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/blog.minnesotaseasons.com\/wp-content\/uploads\/2018\/04\/Pst_02.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1077\" class=\"size-full wp-image-1077\" src=\"http:\/\/blog.minnesotaseasons.com\/wp-content\/uploads\/2018\/04\/Pst_02.jpg\" alt=\"Pst (Pseudomonas syringae pv. tagetis)\" width=\"573\" height=\"860\" srcset=\"https:\/\/blog.minnesotaseasons.com\/wp-content\/uploads\/2018\/04\/Pst_02.jpg 573w, https:\/\/blog.minnesotaseasons.com\/wp-content\/uploads\/2018\/04\/Pst_02-200x300.jpg 200w\" sizes=\"(max-width: 573px) 100vw, 573px\" \/><\/a><p id=\"caption-attachment-1077\" class=\"wp-caption-text\">Pst on Canada thistle<\/p><\/div>\n<p>Visitors to Minnesota\u2019s natural places will occasionally come across a stand of Canada thistle with a few plants that are whitened at the top, appearing bleached. The discoloration is caused by the bacterium <em>Pseudomonas syringae<\/em> pv. <em>tagetis<\/em>. It has been called \u201cWhite\u2010colour Disease of Canadian Thistle,\u201d \u201capical chlorosis of Canada thistle,\u201d and \u201cBacterial Speck\u201d, but it has no widely-accepted common name. It is often referred to in scientific literature as Pst.<\/p>\n<p>Outside of a laboratory, a bacterium is recognized only by the symptoms it produces in its host. Pst produces the substance tagetitoxin, which blocks the production of chloroplasts, preventing photosynthesis. This results in whitened plant growth (chlorosis) on only the upper portion of the plant, stunted growth, fewer shoots, and inhibition of flowering. Pst infects plants in the Aster family, including Canada thistle, common dandelion, common sunflower, common ragweed, giant ragweed, Jerusalem artichoke, and some other plants not found in Minnesota.<\/p>\n<p>Researchers at the University of Minnesota conducted a study in 2002 to assess the viability of using Pst as a biological control agent for Canada thistle.<\/p>\n<p><a href=\"http:\/\/www.minnesotaseasons.com\/Bacteria\/Pst.html\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/www.minnesotaseasons.com\/Bacteria\/Pst.html<\/a><\/p>\n<div class=\"fcbkbttn_buttons_block\" id=\"fcbkbttn_left\"><div class=\"fcbkbttn_like \"><fb:like href=\"https:\/\/blog.minnesotaseasons.com\/?p=1076\" action=\"like\" colorscheme=\"light\" layout=\"button_count\"  size=\"small\"><\/fb:like><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Visitors to Minnesota\u2019s natural places will occasionally come across a stand of Canada thistle with a few plants that are whitened at the top, appearing bleached. The discoloration is caused by the bacterium Pseudomonas syringae pv. tagetis. It has been called \u201cWhite\u2010colour Disease of Canadian Thistle,\u201d \u201capical chlorosis of Canada thistle,\u201d and \u201cBacterial Speck\u201d, but [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[628],"tags":[435,434,433],"_links":{"self":[{"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=\/wp\/v2\/posts\/1076"}],"collection":[{"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1076"}],"version-history":[{"count":2,"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=\/wp\/v2\/posts\/1076\/revisions"}],"predecessor-version":[{"id":1454,"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=\/wp\/v2\/posts\/1076\/revisions\/1454"}],"wp:attachment":[{"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.minnesotaseasons.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}