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Résumé du séminaire de Frederic BRETON - CIRAD Montpellier - TGU AGAP

Ganoderma boninense, causal agent of oil palm (Elaeis guineensis) basal stem rot disease (BSR)

Oil palm satisfies most of the oil and fat requirements of populations in emerging and developing countries. However, oil palm cultivation faces several challenges, among them the emerging of lethal diseases. Ganoderma boninense is a white rot fungus of the polyporales family and the main agent of oil palm basal stem rot (BSR) disease, the worst plague of oil palm plantations in Southeast Asia. In that context, the development of efficient Integrated Pest Management (IPM) strategy to control for BSR is a key issue to achieve sustainability of oil palm plantations, including the limitation of its extension to other environments that need to be conserved. While several studies focused on detecting G. boninense’s infection or deciphering oil palm defense reaction during infection, only little information is available on this pathogen aggressiveness and genetic diversity. To gain knowledge on these lacking points, our research program develops and uses three kinds of tools:

- an artificial inoculation method in nursery allowing the characterization of isolate aggressiveness (Breton et al., 2006),
- genomic resources including reference genome and transcriptome,
- an extensive isolate collection from several infected areas, covering South-East Asia but also South America and Africa where the disease is actually developing.

After introducing these tools, we will focus on some results concerning the set-up of a microsatellite collection (Mercière et al., 2015) and its use to characterize the diversity, structure and demographic history of G. boninense in the historical center of oil palm industrial plantation and BSR development, Sumatra and Penninsular Malaysia (Mercière et al., 2017).