Seed storage behaviour and seed germination in African and Malagasy baobabs (Adansonia species)

Razanameharizaka Juvet Henrinet, Grouzis Michel, Ravelomanana Didier, Danthu Pascal. 2006. Seed storage behaviour and seed germination in African and Malagasy baobabs (Adansonia species). Seed Science Research, 16 : 83-88.

Résumé : The Adansonia (baobab) genus comprises seven species in Africa, six of which are endemic to Madagascar. Depending on the species, baobabs develop in widely varying ecosystems, including arid zones and savannahs, as well as dry and wet forests. Seeds from all species exhibited orthodox behaviour, tolerating dehydration to a moisture content of around 5%. There was no physical dormancy in the two species belonging to the Brevitubae section, A. grandidieri and A, suarezensis. Their seeds germinated without any prior scarification. The five other species, belonging to Adansonia and Longitubae section, have seeds with water-impermeable coats. In the case of A. digitata and A. za, the proportion of water-impermeable seeds was around two-thirds, whereas with A. rubrostipa, A. madagascariensis and A. perrieri, the proportion was >90%. Treatments allowing for the removal of physical dormancy needed to be markedly more severe with A. madagascariensis than with the other species. None the less, it seems impossible to link these characteristics and the interspecific differences to a strategy for adaptation by these species to their environment.

Mots-clés Agrovoc : Adansonia, stockage des semences, germination, traitement des semences, dormance

Mots-clés géographiques Agrovoc : Afrique, Madagascar

Classification Agris : F62 - Physiologie végétale - Croissance et développement
J11 - Manutention, transport, stockage et conservation des produits d'origine végétale

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Razanameharizaka Juvet Henrinet, CIRAD-FORET-URP Forêts et Biodiversité (MDG)
• Grouzis Michel, IRD (MDG)
• Ravelomanana Didier, Université d'Antananarivo (MDG)
• Danthu Pascal, CIRAD-FORET-URP Forêts et Biodiversité (MDG)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/540208/)

Métriques

[ Page générée et mise en cache le 2024-04-19 ]