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Elaboration d'éléments de base de gestion des ressources génétiques de Dalbergia monticola à Madagascar : étude de la diversité génétique et des facteurs socio-économiques

Andrianoelina Andrianaivo Olivarimbola. 2002. Elaboration d'éléments de base de gestion des ressources génétiques de Dalbergia monticola à Madagascar : étude de la diversité génétique et des facteurs socio-économiques. Antananarivo : Université d'Antananarivo, 62 p. Mémoire DEA : Université d'Antananarivo

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Abstract : Many species of malagasy palissandre, as known as Dalbergia spp, are highly purchased for wood supply in national and international trade. So, some species are very exploited. Actually, Dalbergia monticola is classified as threaten palissandre species because of over harvesting. The productivity and wood quality of this species are very interesting as compared to the other palissandre species. This research had done to set up the data bases for the short, medium and large term management of the residual genetics resources of Dalbergia monticola. It contains some informations about the structure of the populations existing, and the socio-economic aspects which are linked to the species management. That is obtained by the knowledge of their genetic diversity and socio-economic factors. In the ten populations of Dalbergia monticola sampled from their natural habitat, the analysis of genetic diversity using molecular markers proves the existence of genetic variability of the populations from the Northern region into the Southern region. The results of variance analysis demonstrate that the diversity within population is important (76.07%) than among population (23.93). Considering the genetic characteristics of the three studies regions (North, Center and South) the North and the Center populations are nearer. In the residual genetics resources, the use and the exploitation of this species are linked to local, regional and national socio-economics factors. The most important of this factors are the increasing of wood needs in the local and international markets, population growth favouring the practice of "Tavy", and the lack of control done by the forest administration because of lack of means. In opposite, the positive interest of local population to protect forest is observed. In the future management of genetic resources of Dalbergia monticola, in situ and ex situ conservation of the genetic variability according to the three analysed regions are recommended. Also, it requires to strengthen the local people in the peripheral zone to participate on the protection and management of resources giving them some training on technique of collect seeds, multiplication methods of the species. For the better management of genetic resources of this species, we still need to continue some researches in multiplication technique, sylviculture, phenology and reinforcement of genetic structure analysis of populations. (Résumé d'auteur)

Mots-clés Agrovoc : Dalbergia, Ressource génétique végétale, Gestion des ressources, Variation génétique

Mots-clés géographiques Agrovoc : Madagascar

Classification Agris : F30 - Plant genetics and breeding

Auteurs et affiliations

  • Andrianoelina Andrianaivo Olivarimbola, CIRAD-FORET-PLANTATIONS (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/507250/)

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