{"id":2168,"date":"2022-02-05T17:03:50","date_gmt":"2022-02-05T16:03:50","guid":{"rendered":"https:\/\/michelecrevecoeur.ch\/?page_id=2168"},"modified":"2022-03-18T13:39:01","modified_gmt":"2022-03-18T12:39:01","slug":"petiole-anatomy","status":"publish","type":"page","link":"https:\/\/michelecrevecoeur.ch\/?page_id=2168","title":{"rendered":"Petiole Anatomy"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2168\" class=\"elementor elementor-2168\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-15f8b8d9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"15f8b8d9\" 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-a3eb6d6\" data-id=\"a3eb6d6\" 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-35ac23c0 elementor-widget elementor-widget-text-editor\" data-id=\"35ac23c0\" 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-top: 15px; margin-bottom: 15px; line-height: 25.2px; color: #404040; font-family: arial; font-size: 14px; font-style: normal; font-weight: 400; text-align: center;\"><span style=\"font-size: medium; color: #003366;\"><strong>Cross section in petioles of various plants<br \/><\/strong><strong>Bean, nettle, tobacco, ficus, apium, grape, xanthosoma.<\/strong><\/span><\/p><p style=\"margin-top: 15px; margin-bottom: 15px; line-height: 25.2px; color: #404040; font-family: arial; font-size: 14px; font-style: normal; font-weight: 400;\">In many dicotyledons and in some monocotyledons, the leaf is borne on a petiole, generally at a node level and its length varies according to the plant. The two main roles of the petiole are\u00a0mechanical support (resistance to the wind) and orientation of the blade or lamina to allow tracking of sun light. It also enables the lamina to twist and partly rotate in the wind. Many leaves lack petioles, and they are termed \u201csessile\u201d meaning that the blade is directly seated on the stem. In some monocots the base of the leaf is expanded out into a sheath, which wraps around the stem.<br \/>The section of a petiole is frequently circular or semicircular but there is a great variability in the form of this organ that can also be flat, triangular. Petioles in some plants have alimentary uses such as rhubarb, celery.<br \/>In a petiole we find the same tissues as stems. The protective tissue in contact with environment consists in a uniseriate epidermis with cuticle, stomata and often trichomes. Below the epidermis we find the ground tissue, parenchyma, that commonly contains layers of support tissues, most generally collenchyma. The center of petiole is occupied by parenchyma. The vascular bundles show a variety of arrangements and of size and are in continuity with those in midrib of the lamina and in internode. They are often disposed on a ring sometimes on two rings. Xylem is oriented towards the center and phloem towards the outside.<\/p><p style=\"margin-top: 15px; margin-bottom: 15px; line-height: 25.2px; color: #404040; font-family: arial; font-size: 14px; font-style: normal; font-weight: 400;\">The sections in petioles shown on this page have been made, stained, and photographed in the histology and cytology unit \u2013 Plant Biology Department &#8211; Geneva University. One exception : the section in a petiole of common Ficus comes from the Georges Roux collection.<\/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-c6867d0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c6867d0\" 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-33 elementor-top-column elementor-element elementor-element-a257d61\" data-id=\"a257d61\" 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-016c8f5 elementor-widget elementor-widget-text-editor\" data-id=\"016c8f5\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Bean<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87aa524 elementor-widget elementor-widget-image\" data-id=\"87aa524\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2189\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"299\" height=\"253\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/52ea671a282357a889fea7fd89f38fd2_f499.jpg\" class=\"attachment-large size-large wp-image-2173\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-66e2a60\" data-id=\"66e2a60\" 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-c6d724b elementor-widget elementor-widget-text-editor\" data-id=\"c6d724b\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Nettle<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04b0682 elementor-widget elementor-widget-image\" data-id=\"04b0682\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2198%20\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"250\" height=\"254\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/ce15250c0ab202b1b390e0547245bdfd_f502.jpg\" class=\"attachment-large size-large wp-image-2172\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-4e9f6b1\" data-id=\"4e9f6b1\" 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-dea607c elementor-widget elementor-widget-text-editor\" data-id=\"dea607c\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Tobacco<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ce15c6 elementor-widget elementor-widget-image\" data-id=\"8ce15c6\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2217\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"249\" height=\"258\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/3fd26af9afa720f711f9bb1f2605d5e6_f501.jpg\" class=\"attachment-large size-large wp-image-2171\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b9f8cc7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b9f8cc7\" 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-33 elementor-top-column elementor-element elementor-element-bcdda86\" data-id=\"bcdda86\" 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-342f626 elementor-widget elementor-widget-text-editor\" data-id=\"342f626\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Ficus(1)<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2291300 elementor-widget elementor-widget-image\" data-id=\"2291300\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2207\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"299\" height=\"267\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/bc91e2240b75bcb77487dc6b934a5911_f504.jpg\" class=\"attachment-large size-large wp-image-2177\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-35e85db\" data-id=\"35e85db\" 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-cecf704 elementor-widget elementor-widget-text-editor\" data-id=\"cecf704\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Ficus (2)<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2766f94 elementor-widget elementor-widget-image\" data-id=\"2766f94\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2237\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"259\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/1939983eaf25eaa67b05f9ae159e95a8_f603.jpg\" class=\"attachment-large size-large wp-image-2178\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-6418f37\" data-id=\"6418f37\" 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-dc4e055 elementor-widget elementor-widget-text-editor\" data-id=\"dc4e055\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Celery<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f7ea65e elementor-widget elementor-widget-image\" data-id=\"f7ea65e\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2223\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"319\" height=\"234\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/e68da960b5518054d1ec68a38c8811e7_f500.jpg\" class=\"attachment-large size-large wp-image-2179\" alt=\"\" srcset=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/e68da960b5518054d1ec68a38c8811e7_f500.jpg 319w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/e68da960b5518054d1ec68a38c8811e7_f500-300x220.jpg 300w\" sizes=\"(max-width: 319px) 100vw, 319px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-98009f0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"98009f0\" 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-33 elementor-top-column elementor-element elementor-element-a18adf1\" data-id=\"a18adf1\" 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-f620e39 elementor-widget elementor-widget-text-editor\" data-id=\"f620e39\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Grape<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7e78852 elementor-widget elementor-widget-image\" data-id=\"7e78852\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=2231\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"222\" height=\"229\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/Site_mini_photo_Petiole_vigne-1.jpg\" class=\"attachment-large size-large wp-image-2181\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-3f41bee\" data-id=\"3f41bee\" 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-e8c4cd8 elementor-widget elementor-widget-text-editor\" data-id=\"e8c4cd8\" 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=\"text-align: center;\"><strong><span style=\"color: #333333;\">Citrus<\/span><\/strong><\/p><p><a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=3627\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-3630 aligncenter\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-300x300.jpg\" alt=\"\" width=\"230\" height=\"230\" srcset=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-300x300.jpg 300w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-1024x1024.jpg 1024w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-150x150.jpg 150w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-768x767.jpg 768w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-1536x1534.jpg 1536w, https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/03\/Site-EN-coupe-petiole-citrus-2048x2045.jpg 2048w\" sizes=\"(max-width: 230px) 100vw, 230px\" \/><\/a><\/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<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-63aa77a\" data-id=\"63aa77a\" 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-db46434 elementor-widget elementor-widget-text-editor\" data-id=\"db46434\" 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=\"text-align: center;\"><strong style=\"color: #404040; font-family: arial; font-size: 14px; text-align: center;\"><span style=\"color: #000080;\">Xanthosoma<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-33760a9 elementor-widget elementor-widget-image\" data-id=\"33760a9\" 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\t<a href=\"https:\/\/michelecrevecoeur.ch\/?page_id=3446\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"270\" src=\"https:\/\/michelecrevecoeur.ch\/wp-content\/uploads\/2022\/02\/bef1a05aeb5031a3cb73f45f6bc84ead_f753.jpg\" class=\"attachment-large size-large wp-image-2182\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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>Cross section in petioles of various plantsBean, nettle, tobacco, ficus, apium, grape, xanthosoma. In many dicotyledons and in some monocotyledons, the leaf is borne on a petiole, generally at a node level and its length varies according to the plant. The two main roles of the petiole are\u00a0mechanical support (resistance to the wind) and orientation [&hellip;]<\/p>\n","protected":false},"author":2,"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-2168","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - 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