{"id":4237,"date":"2015-10-09T12:47:34","date_gmt":"2015-10-09T10:47:34","guid":{"rendered":"http:\/\/botanico.uclm.es\/project\/environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil-2\/"},"modified":"2022-12-21T18:31:07","modified_gmt":"2022-12-21T17:31:07","slug":"environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil","status":"publish","type":"project","link":"https:\/\/botanico.uclm.es\/en\/project\/environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil\/","title":{"rendered":"Environmental regulation of embryo growth, dormancy breaking and germination in Narcissus alcaracensis (amaryllidaceae), a threatened endemic Iberian daffodil."},"content":{"rendered":"<style type=\"text\/css\"> \n#cmsms_row_69d953db5b555 .cmsms_row_outer_parent { \n\tpadding-top: 0px; \n} \n\n#cmsms_row_69d953db5b555 .cmsms_row_outer_parent { \n\tpadding-bottom: 50px; \n} \n\n\n#cmsms_button_69d953db5b5f1 { \n\ttext-align:center; \n} \n\n#cmsms_button_69d953db5b5f1 .cmsms_button:before { \n\tmargin-right:.5em; \n\tmargin-left:0; \n\tvertical-align:baseline; \n} \n\n#cmsms_button_69d953db5b5f1 .cmsms_button { \n\tfont-weight:100; \n\tfont-style:normal; \n\tpadding-right:20px; \n\tpadding-left:20px; \n} \n#cmsms_button_69d953db5b5f1 .cmsms_button:hover { \n} \n<\/style><div id=\"cmsms_row_69d953db5b555\" class=\"cmsms_row cmsms_color_scheme_default\">\n<div class=\"cmsms_row_outer_parent\">\n<div class=\"cmsms_row_outer\">\n<div class=\"cmsms_row_inner\">\n<div class=\"cmsms_row_margin\">\n<div class=\"cmsms_column one_first\">\n<div class=\"cmsms_text\">\n<h2 class=\"abstractTitle\">A<span class=\"smallcaps\">bstract<\/span><\/h2>\n<p class=\"last\">Developing a conservation plan for threatened plant species requires a solid understanding of seed germination ecology. The aims of this study were: (1) to discover the requirements for embryo growth, dormancy breaking, and germination; and (2) to determine the effect of seed age on embryo growth and germination of <i>Narcissus alcaracensis<\/i> (Amaryllidaceae), an endangered Mediterranean daffodil endemic to southern Iberian Peninsula. The phenologies of germination and embryo growth were studied in natural conditions. Temperature requirements for embryo growth and germination, and the effect of gibberellic acid (GA<sub>3<\/sub>) on germination were determined by incubating seeds under controlled laboratory conditions. In natural conditions, embryo growth starts in late autumn. Seedlings emerge in late winter shortly after the embryos reach a critical length of 3.3\u00a0mm, quite longer than the initial embryo length at dispersal (1.42\u00a0mm). In the laboratory, embryo growth occurs during a prolonged incubation period at 5\u00a0C. Stratification at 5\u00a0C breaks the physiological and morphological dormancy, enabling seeds to germinate at a wide range of temperatures. Cold stratification at alternating day\/night temperatures of 9\/5\u00a0C or constant day\/night temperatures of 10\u00a0C also promoted germination. The velocity of embryo growth and germination percentages increased with seed age. Seeds of <i>N. alcaracensis<\/i> show intermediate complex morphophysiological dormancy (MPD). This is the first time that this level of MPD was detected in <i>Narcissus<\/i>, and the second one reporting an increase of embryo-growth velocity with seed age in morphophysiologically dormant seeds.<\/p>\n<\/div>\n\n<div id=\"cmsms_button_69d953db5b5f1\" class=\"button_wrap\"><a href=\"http:\/\/dx.doi.org\/10.1674\/0003-0031-169.1.147\" class=\"cmsms_button\" target=\"_blank\">Link to the article<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":4235,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":[],"pj-categs":[79],"pj-tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Environmental regulation of embryo growth, dormancy breaking and germination in Narcissus alcaracensis (amaryllidaceae), a threatened endemic Iberian daffodil. - Instituto Bot\u00e1nico<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/botanico.uclm.es\/en\/project\/environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Environmental regulation of embryo growth, dormancy breaking and germination in Narcissus alcaracensis (amaryllidaceae), a threatened endemic Iberian daffodil. - Instituto Bot\u00e1nico\" \/>\n<meta property=\"og:url\" content=\"https:\/\/botanico.uclm.es\/en\/project\/environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil\/\" \/>\n<meta property=\"og:site_name\" content=\"Instituto Bot\u00e1nico\" \/>\n<meta property=\"article:modified_time\" content=\"2022-12-21T17:31:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/botanico.uclm.es\/wp-content\/uploads\/2015\/10\/AMN.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"330\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/botanico.uclm.es\/en\/project\/environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil\/\",\"url\":\"https:\/\/botanico.uclm.es\/en\/project\/environmental-regulation-of-embryo-growth-dormancy-breaking-and-germination-in-narcissus-alcaracensis-amaryllidaceae-a-threatened-endemic-iberian-daffodil\/\",\"name\":\"Environmental regulation of embryo growth, dormancy breaking and germination in Narcissus alcaracensis (amaryllidaceae), a threatened endemic Iberian daffodil. - 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