{"id":40,"date":"2016-10-12T18:15:40","date_gmt":"2016-10-12T22:15:40","guid":{"rendered":"http:\/\/132.236.156.160\/cuccap\/?page_id=40"},"modified":"2024-03-02T22:46:43","modified_gmt":"2024-03-03T03:46:43","slug":"squash","status":"publish","type":"page","link":"http:\/\/132.236.156.160\/cuccap\/breeding\/squash\/","title":{"rendered":"Breeding Squash for Disease Resistance"},"content":{"rendered":"<div id=\"attachment_3397\" style=\"width: 610px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/squash-pollination.jpg\"><img aria-describedby=\"caption-attachment-3397\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-3397 size-full\" src=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/squash-pollination.jpg\" alt=\"hand pollinating squash flower\" width=\"600\" height=\"452\" srcset=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/squash-pollination.jpg 600w, http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/squash-pollination-300x226.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-3397\" class=\"wp-caption-text\">Image provided by L. Wessel-Beaver, University of Puerto Rico.<\/p><\/div>\n<h2><em>Cucurbita spp.<\/em><\/h2>\n<ul>\n<li><strong><a href=\"#powdery-mildew\">Powdery Mildew<\/a><\/strong><\/li>\n<li><strong><a href=\"#phytophthora-blight\">Phytophthora Blight<\/a><\/strong><\/li>\n<li><strong><a href=\"#virus-diseases\">Virus Diseases<\/a><\/strong><\/li>\n<\/ul>\n<hr \/>\n<h2 id=\"powdery-mildew\">Powdery Mildew<\/h2>\n<p>Powdery mildew is a disease that affects all cucurbits and is important in squash. Resistance was introduced from the wild species, <em>Cucurbita marintezii<\/em> in <em>C. moschata<\/em> and <em>C. pepo<\/em>.<\/p>\n<p>The resistance gene, Pm-0, is a single incompletely dominant gene that is commonly deployed in the heterozygous condition. We have defined this introgression and have found a candidate gene that we are effectively using for marker assisted selection for this resistance.<\/p>\n<p>Numerous resistant cultivars are available in <em>C. moschata<\/em> and <em>C. pepo<\/em>.<\/p>\n<hr \/>\n<h2 id=\"phytophthora-blight\">Phytophthora blight<\/h2>\n<p>Phytophthora blight is found in infested soil and irrigation water and affects many vegetables. In squash and pumpkin it affects the root and crown of the plant and also the fruit that are particularly vulnerable if they lay upon infested soil. Resistance in the root and crown is derived from both the wild species <em>C. martinezii<\/em> and accessions of <em>C. moschata<\/em>.<\/p>\n<p>Our breeding approach is to combine the resistances available in the vegetative portions of the plant with a compact bush architecture that would keep fruit upon raised beds and thus avoid exposure to pathogen infested soil. Concurrent genomics studies will facilitate the creation of tools for resistance breeding.<\/p>\n<div id=\"attachment_2818\" style=\"width: 460px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-2818\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-2818 size-full\" src=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2017\/03\/phytophthora-symptoms-plant-wilt.jpg\" alt=\"wilted plant\" width=\"450\" height=\"382\" srcset=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2017\/03\/phytophthora-symptoms-plant-wilt.jpg 450w, http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2017\/03\/phytophthora-symptoms-plant-wilt-300x255.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><p id=\"caption-attachment-2818\" class=\"wp-caption-text\">Symptoms of Phytophthora blight on squash include wilt. Image provided by Chris Smart, Cornell University.<\/p><\/div>\n<hr \/>\n<h2 id=\"virus-diseases\">Virus Diseases<\/h2>\n<p>Aphid transmitted viruses (Watermelon mosaic virus, Papaya ringspot virus, Zucchini yellow mosaic virus and Cucumber mosaic virus) are especially challenging for squash production in the Southeastern US. Resistance found in <em>C. moschata<\/em> and <em>C. equadorensis<\/em>\u00a0was transferred into cultivated forms of <em>C. moschata<\/em> and <em>C. pepo<\/em> through conventional breeding approaches.<\/p>\n<p>Some cultivars are available with resistance to these viruses individually and in combination. Transgenic squash with coat protein-derived resistance also exist.<\/p>\n<p>Efforts are underway to create tools for MAS for resistance.<\/p>\n<div id=\"attachment_3117\" style=\"width: 460px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-3117\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-3117\" src=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/prsv-squash-300x225.jpg\" alt=\"prsv on squash\" width=\"450\" height=\"337\" srcset=\"http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/prsv-squash-300x225.jpg 300w, http:\/\/132.236.156.160\/cuccap\/wp-content\/uploads\/sites\/6\/2016\/10\/prsv-squash.jpg 509w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><p id=\"caption-attachment-3117\" class=\"wp-caption-text\">Papaya ringspot virus on squash. Image provided by L. Wessel-Beaver, University of Puerto Rico.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Cucurbita spp. Powdery Mildew Phytophthora Blight Virus Diseases Powdery Mildew Powdery mildew is a disease that affects all cucurbits and is important in squash. Resistance was introduced from the wild species, Cucurbita marintezii in C. moschata and C. pepo. The resistance gene, Pm-0, is a single incompletely dominant gene that is commonly deployed in the [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":1211,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"page-fullwidth.php","meta":{"footnotes":""},"tags":[254,470,576,564],"_links":{"self":[{"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/pages\/40"}],"collection":[{"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/comments?post=40"}],"version-history":[{"count":86,"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/pages\/40\/revisions"}],"predecessor-version":[{"id":15788,"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/pages\/40\/revisions\/15788"}],"up":[{"embeddable":true,"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/pages\/1211"}],"wp:attachment":[{"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/media?parent=40"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/132.236.156.160\/cuccap\/wp-json\/wp\/v2\/tags?post=40"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}