{"id":16848,"date":"2026-06-20T12:53:30","date_gmt":"2026-06-20T12:53:30","guid":{"rendered":"https:\/\/dev.iita.org\/news-item\/90-sah-plantlet-survival-rate-boosting-cassava-seed-availability-in-rwanda\/"},"modified":"2026-06-29T18:35:45","modified_gmt":"2026-06-29T18:35:45","slug":"90-sah-plantlet-survival-rate-boosting-cassava-seed-availability-in-rwanda","status":"publish","type":"news-item","link":"https:\/\/iita.org\/fr\/news-item\/90-sah-plantlet-survival-rate-boosting-cassava-seed-availability-in-rwanda\/","title":{"rendered":"Le taux de survie des plantules 90% SAH contribue \u00e0 accro\u00eetre la disponibilit\u00e9 des semences de manioc au Rwanda"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Le secteur du manioc au Rwanda a fait face \u00e0 des d\u00e9fis importants au fil des ans, principalement en raison des effets d\u00e9vastateurs des maladies virales du manioc, en particulier la mosa\u00efque du manioc (CMD) et la pourriture brune des racines du manioc (CBSD). Ces deux maladies ont gravement menac\u00e9 la s\u00e9curit\u00e9 alimentaire et les moyens de subsistance de nombreux producteurs de manioc \u00e0 travers le pays. En 2014\/2015, l'usine de manioc de Kinazi, une entreprise franchis\u00e9e cr\u00e9\u00e9e pour faire face \u00e0 la surproduction du march\u00e9, a failli fermer ses portes en raison d'une p\u00e9nurie de racines ad\u00e9quates pour la transformation. Dans une tentative d\u00e9sesp\u00e9r\u00e9e pour att\u00e9nuer la crise, le gouvernement rwandais (GoR) a import\u00e9 des millions de boutures de tiges saines d'Ouganda, offrant un r\u00e9pit temporaire mais pas de solution durable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><figure id=\"attachment_30103\" aria-describedby=\"caption-attachment-30103\" style=\"width: 820px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-30103\" src=\"https:\/\/iita.org\/wp-content\/uploads\/2026\/06\/Dr-Silver-Tumwegamire-a-Cassava-Breeder-at-IITA.jpg\" alt=\"Dr Silver Tumwegamire, a Cassava Breeder at IITA, and Sebukeye Andre, a Lab Technician, were assessing the progress of plantlets at the SAH laboratory established at RAB, Rubona Station.\" width=\"820\" height=\"411\" \/><figcaption id=\"caption-attachment-30103\" class=\"wp-caption-text\">Le Dr Silver Tumwegamire, s\u00e9lectionneur de manioc \u00e0 l'IITA, et Sebukeye Andre, technicien de laboratoire, \u00e9valuaient la progression des plantules au laboratoire SAH \u00e9tabli au RAB, station de Rubona.<\/figcaption><\/figure><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En r\u00e9ponse \u00e0 cette crise, <a href=\"https:\/\/iita.org\/fr\/\">IITA<\/a>, en collaboration avec le Conseil de d\u00e9veloppement de l'agriculture et des ressources animales du Rwanda (RAB) et d'autres partenaires, a lanc\u00e9 des efforts en 2017 pour contrer l'impact n\u00e9gatif des maladies virales du manioc. Ces efforts comprennent le <a href=\"https:\/\/iita.org\/fr\/iita-project\/fight-cassava-brown-streak-disease-and-cassava-mosaic-disease-through-the-deployment-of-new-resistant-germplasm-and-clean-seed-in-burundi-and-rwanda\/\">Projet de lutte contre la CBSD financ\u00e9 par le FIDA<\/a>, le <a href=\"https:\/\/iita.org\/fr\/iita-project\/cassava-agribusiness-seed-systems-cass\/\">Syst\u00e8mes semenciers de l'agroentreprise du manioc (CASS), financ\u00e9s par le gouvernement n\u00e9erlandais<\/a> Projet, et le r\u00e9cent projet de d\u00e9ploiement ViRCA financ\u00e9 par la Fondation Bill et Melinda Gates. Toutes ces initiatives se sont concentr\u00e9es sur le d\u00e9veloppement et le d\u00e9ploiement de vari\u00e9t\u00e9s am\u00e9lior\u00e9es r\u00e9sistantes et sur la mise en place d'un syst\u00e8me durable de fourniture de plants sains. Ces mesures ont \u00e9t\u00e9 cruciales pour endiguer la propagation de la maladie et am\u00e9liorer la productivit\u00e9 de la culture du manioc dans les fermes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Silver Tumwegamire, obturateur de manioc et expert en syst\u00e8mes semenciers \u00e0 l'IITA, a d\u00e9clar\u00e9 : \u201c Conscients de l'impact s\u00e9v\u00e8re des maladies virales du manioc sur la s\u00e9curit\u00e9 alimentaire, nous avons initi\u00e9 et mis en \u0153uvre plusieurs projets visant \u00e0 d\u00e9velopper et \u00e0 d\u00e9ployer des vari\u00e9t\u00e9s r\u00e9sistantes aux maladies ainsi qu'\u00e0 \u00e9tablir un syst\u00e8me semencier robuste. \u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans un premier temps, l'IITA et le RAB ont mis en place une unit\u00e9 de multiplication de semences pr\u00e9base, utilisant des protocoles optimis\u00e9s pour la micropropagation de plants issus de culture in vitro test\u00e9s n\u00e9gatifs aux virus, ainsi que des techniques d'acclimatation et de macropropagation en serre insectif\u00e8re. Cependant, le durcissement des plantules issues de culture in vitro (CIV) dans les conditions froides de la station de Rubona a entra\u00een\u00e9 de faibles taux de survie, ce qui a compliqu\u00e9 les efforts visant \u00e0 produire rapidement un nombre suffisant de plants.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><figure id=\"attachment_30090\" aria-describedby=\"caption-attachment-30090\" style=\"width: 820px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-30090 size-full\" src=\"https:\/\/iita.org\/wp-content\/uploads\/2026\/06\/90-SAH-P2.jpg\" alt=\"Plantlets in the SAH lab at RAB&apos;s Rubona Research Station.\" width=\"820\" height=\"411\" \/><figcaption id=\"caption-attachment-30090\" class=\"wp-caption-text\">Plantules dans le laboratoire SAH de la station de recherche de Rubona du RAB.<\/figcaption><\/figure><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I<a href=\"https:\/\/www.youtube.com\/watch?v=i1O8hVQrlvg\">Pr\u00e9sentation de la technologie de la culture hydroponique semi-autotrophie (SAH)<\/a> en 2019 a offert une solution \u00e9conomique et efficace. La technologie SAH a consid\u00e9rablement am\u00e9lior\u00e9 les taux de survie des usines de durcissement, facilitant ainsi la production de grandes quantit\u00e9s de pr\u00e9-semences de base propres. Cette technologie a \u00e9t\u00e9 introduite gr\u00e2ce au soutien collaboratif de trois projets : le <a href=\"https:\/\/taat-africa.org\/\">Technologies pour la transformation de l'agriculture en Afrique (TAAT),<\/a> le projet de contr\u00f4le du CBSD et le projet de syst\u00e8mes de semences d'agroentreprise du manioc (CASS).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depuis son introduction, le SAH a r\u00e9volutionn\u00e9 la production et la disponibilit\u00e9 de semences pr\u00e9-base propres au Rwanda. Le laboratoire SAH, le laboratoire de culture tissulaire (TC) et quatre grands serres-filets constituent conjointement une unit\u00e9 fonctionnelle de semences pr\u00e9-base sous l'\u00e9gide du RAB et peuvent produire plus de 200 000 vitroplants ou mini-tubercules par an dans le cadre d'un syst\u00e8me \u00e0 d\u00e9bit mod\u00e9r\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Athanase Nduwumuremyi, obtenteur de manioc et coordinateur des cultures racines au RAB, a expliqu\u00e9 : \u201c La technologie de l'ASA a chang\u00e9 la donne pour la multiplication des semences de manioc au Rwanda. Elle nous a permis de produire des plantules de haute qualit\u00e9 beaucoup plus rapidement, garantissant ainsi un approvisionnement r\u00e9gulier en semences saines pour les agriculteurs. \u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela a consid\u00e9rablement am\u00e9lior\u00e9 les taux de multiplication, garantissant un approvisionnement ad\u00e9quat en plantules saines pour le niveau suivant de multiplication et de distribution de semences de g\u00e9n\u00e9ration pr\u00e9coce. De janvier \u00e0 avril 2024, le RAB a produit 55 569 pr\u00e9-semences ou plantules, avec pour objectif d'atteindre 200 000 plantules d'ici la fin de l'ann\u00e9e. \u00c0 partir de ces plantules, au moins 10 ha de semences essentielles saines peuvent \u00eatre produits chaque ann\u00e9e, fournissant au moins 2 millions de boutures de tiges pour la production de semences certifi\u00e9es de premi\u00e8re g\u00e9n\u00e9ration dans le pays.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><figure id=\"attachment_30091\" aria-describedby=\"caption-attachment-30091\" style=\"width: 820px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-30091 size-full\" src=\"https:\/\/iita.org\/wp-content\/uploads\/2026\/06\/90-SAH-P3.jpg\" alt=\"SAH is contributing to an adequate supply chain of cassava clean seeds in Rwanda.\" width=\"820\" height=\"411\" \/><figcaption id=\"caption-attachment-30091\" class=\"wp-caption-text\">SAH contribue \u00e0 un approvisionnement ad\u00e9quat en semences propres de manioc au Rwanda.<\/figcaption><\/figure><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">De plus, le RAB fournit des plantules \u00e0 d'autres multiplieuds de semences de base priv\u00e9s dot\u00e9s de serres moustiquaires. On estime que chacun d'eux \u00e9tablit au moins un hectare de semences de base saines et produit un minimum suppl\u00e9mentaire de 0,8 million de boutures de tiges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La technologie SAH affiche un taux de survie de 90% pour les plantules. En trois semaines, 25 plantules plant\u00e9es dans un bac peuvent en produire 62, qui peuvent \u00e0 leur tour se multiplier pour atteindre 156 au bout de trois semaines suppl\u00e9mentaires, ce qui d\u00e9montre un taux de multiplication sup\u00e9rieur \u00e0 celui du syst\u00e8me de multiplication par boutures \u00e0 deux n\u0153uds. Le rapport co\u00fbt-efficacit\u00e9 de la technologie SAH, sa facilit\u00e9 d\u2019acclimatation et ses taux de survie \u00e9lev\u00e9s en font une alternative sup\u00e9rieure aux m\u00e9thodes traditionnelles de culture tissulaire et de micropropagation SH, o\u00f9 seuls 20% de plantules peuvent survivre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le RAB, soutenu par l'IITA, a r\u00e9cemment optimis\u00e9 un substrat de fabrication locale \u00e0 base de tourbe pour la micropropagation en installations SAH, r\u00e9duisant ainsi la d\u00e9pendance au substrat co\u00fbteux Klansman pour la macropropagation. De plus, le RAB optimise la technique de macropropagation par bouturage \u00e0 un n\u0153ud afin d'am\u00e9liorer les taux de multiplication des semences pr\u00e9-de-base.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Contribu\u00e9 par Ritha Bumwe<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Rwanda&#8217;s cassava sector has faced significant challenges over the years, primarily due to the devastating effects of cassava viral diseases, mainly the Cassava Mosa\u00efc Disease (CMD) and Cassava Brown Streak Disease (CBSD).<\/p>","protected":false},"featured_media":16849,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","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":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","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-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":"","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-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":"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":""},"mobile":{"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":""}}},"tags":[1975],"science-area":[],"program":[],"location":[40],"news-type":[],"hub":[62],"crop":[66],"impact-areas":[],"item-year":[202],"class_list":["post-16848","news-item","type-news-item","status-publish","has-post-thumbnail","hentry","tag-cassavaplant-healthsahseed-systemssemi-autotrophic-hydroponicstissue-culture","location-rwanda","hub-eastern-africa","crop-cassava","item-year-202"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - 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