{"id":2349,"date":"2022-02-08T17:50:48","date_gmt":"2022-02-08T16:50:48","guid":{"rendered":"https:\/\/michelecrevecoeur.ch\/?page_id=2349"},"modified":"2022-02-08T18:26:32","modified_gmt":"2022-02-08T17:26:32","slug":"primary-meristem","status":"publish","type":"page","link":"https:\/\/michelecrevecoeur.ch\/?page_id=2349","title":{"rendered":"Primary meristem cells"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2349\" class=\"elementor elementor-2349\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4c84f3ce elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4c84f3ce\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1e701c3\" data-id=\"1e701c3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-260d199 elementor-widget elementor-widget-text-editor\" data-id=\"260d199\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"margin: 11.25pt 0cm; text-align: center; line-height: 18.9pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\" align=\"center\"><strong><span lang=\"EN-US\" style=\"font-size: 13.5pt; color: #003366;\">Primary meristem: cellular characteristics <\/span><\/strong><\/p><p style=\"margin: 11.25pt 0cm; line-height: 18.9pt; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\"><span lang=\"EN-US\" style=\"font-size: 10.5pt; color: #404040;\">The cells are undifferentiated and are isodiametric, oval, rounded or rectangular and small (~10 \u00b5m x 10 \u00b5m) without intercellular spaces. They have only primary cell walls, thin and pectocellulosic with predominance of pectin. The cytoplasm is dense, with high density of ribosomes and vacuoles are absent or numerous and small. The plastids are proplastids that are poorly differentiated, and the nucleus is prominent (Nucleus\/cytoplasm ratio high).<br \/>The cells show high capacity of divisions (numerous mitoses observed with appropriated cytological staining) and a very high metabolic activity.<br \/><\/span><span style=\"color: #404040; font-size: 10.5pt; font-style: inherit; font-weight: inherit;\">Below: transmission electron micrographs illustrating some of their characteristics. On the left a cell of spinach, <\/span><em style=\"color: #404040; font-size: 10.5pt; font-weight: inherit;\">Spinacia oleracea, <\/em><em style=\"color: #404040; font-size: 10.5pt; font-weight: inherit;\"><span style=\"font-style: normal;\">shoot meristem and on the right a cell of primary root meristem of maize, <\/span><\/em><em style=\"color: #404040; font-size: 10.5pt; font-weight: inherit;\">Zea mays.<\/em><span style=\"color: #404040; font-size: 10.5pt; font-style: inherit; font-weight: inherit;\">\u00a0\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-02df441 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"02df441\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-af346d4\" data-id=\"af346d4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b3f930b elementor-widget elementor-widget-image\" data-id=\"b3f930b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"454\" height=\"416\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-1.jpg\" class=\"attachment-large size-large wp-image-2352\" alt=\"\" srcset=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-1.jpg 454w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-1-300x275.jpg 300w\" sizes=\"(max-width: 454px) 100vw, 454px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"> a : starch; m: mitochondria; nu : nucleolus ; pa: primary cell wall; pd : plasmodesma; ppl: proplastid; v: vacuole. Numerous plasmodesmata are observed which traverse cell wall of adjacent cells.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-d7bc00f\" data-id=\"d7bc00f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bd88142 elementor-widget elementor-widget-image\" data-id=\"bd88142\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"449\" height=\"420\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-2.jpg\" class=\"attachment-large size-large wp-image-2353\" alt=\"\" srcset=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-2.jpg 449w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-2-300x281.jpg 300w\" sizes=\"(max-width: 449px) 100vw, 449px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">EN: nuclear enveloppe; hc: heterochromatin; M: mitochondria; Mb: plasma membrane ;  No: nucleus ; Nu: nucleolus; pro: proplast; Pa: cell wall; RER: endoplasmic reticulum ; Va : vacuole<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1db1212 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1db1212\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-25d1f84\" data-id=\"25d1f84\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c96a01a elementor-widget elementor-widget-text-editor\" data-id=\"c96a01a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span lang=\"EN-US\" style=\"font-size: 10.5pt; line-height: 107%; font-family: 'Arial',sans-serif; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; color: #404040; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;\">Below: part of the primary cell wall between two adjacent cells with numerous plasmodesmata (red arrows). The plasma membrane appears as a thin electron dense line appressed against the cell wall (blue arrow). In the cytoplasm there are two mitochondria (M) with poorly developed\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8bf3b0f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8bf3b0f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-755c146\" data-id=\"755c146\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a10a168 elementor-widget elementor-widget-image\" data-id=\"a10a168\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"649\" height=\"646\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-3.jpg\" class=\"attachment-large size-large wp-image-2354\" alt=\"\" srcset=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-3.jpg 649w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-3-300x300.jpg 300w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Meristeme-primaire-cellules-3-150x150.jpg 150w\" sizes=\"(max-width: 649px) 100vw, 649px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Primary meristem: cellular characteristics The cells are undifferentiated and are isodiametric, oval, rounded or rectangular and small (~10 \u00b5m x 10 \u00b5m) without intercellular spaces. They have only primary cell walls, thin and pectocellulosic with predominance of pectin. The cytoplasm is dense, with high density of ribosomes and vacuoles are absent or numerous and small. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-2349","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Primary meristem cells - Mich\u00e8le Cr\u00e8vecoeur<\/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:\/\/michelecrevecoeur.ch\/?page_id=2349\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Primary meristem cells - Mich\u00e8le Cr\u00e8vecoeur\" \/>\n<meta property=\"og:description\" content=\"Primary meristem: cellular characteristics The cells are undifferentiated and are isodiametric, oval, rounded or rectangular and small (~10 \u00b5m x 10 \u00b5m) without intercellular spaces. 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