Vanilla perrieri and Vanilla bosseri: potential model species for studying the bioclimatic adaptation of vanilla plants

Harinomena Rinah Ravelonanosy, Andriamihaja Felambinintsoa Cathucia, Charron Carine, Grisoni Michel, Ramarosandratana Aro Vonjy, Fuzzati Nicola, Besse Pascale. 2024. Vanilla perrieri and Vanilla bosseri: potential model species for studying the bioclimatic adaptation of vanilla plants. In : Book of abstracts, 5th International Vanilla Congress, 4-7 June 2024, Reunion Island, France. CIRAD, Université de la Réunion. Saint-Pierre : CIRAD-Université de la Réunion, Résumé, p. 44. International Vanilla Congress (IVC 2024). 5, Saint-Pierre, Réunion, 4 Juin 2024/7 Juin 2024.

Résumé : Genome–environment associations (GEA) in crop wild relatives that exhibit natural adaptation enable the identification of adaptive loci, which may be important in crop breeding for abiotic stress tolerance. Leafless Vanilla species in Madagascar have developed such adaptation and their speciation was shown to involve ecological selection by bioclimatic factors. In this study, the feasibility of a GEA approach was assessed using accessions of V. perrieri and V. bosseri, which are widely distributed in Madagascar. Genetic differentiation has been observed across diverse habitat types, using data from seven microsatellites. Principal component analyses of 19 environmental variables revealed a bioclimatic structure based on sample collection sites. For each species, redundancy analyses demonstrated that geographic distance (Isolation By Distance) and environmental variations (Isolation By Environment) (temperatures and precipitations) contributed to the genetic structure of the populations. These results indicate the presence of local adaptation in populations of these two species and suggest that they represent appropriate model species for studying the climatic adaptation of vanilla plants. Therefore, Genotyping-By-Sequencing (GBS) markers were developed for V. perrieri to identify candidate markers through a preliminary GEA analysis. Ultimately, the candidate loci identified will be useful for the selection of heat and drought-tolerant vanilla cultivars.

Mots-clés libres : Vanilla, Local adaptation, Genome-environment associations, Landscape genetics

Auteurs et affiliations

• Harinomena Rinah Ravelonanosy, Université de la Réunion (REU)
• Andriamihaja Felambinintsoa Cathucia, Université de la Réunion (REU)
• Charron Carine, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0003-0281-9936
• Grisoni Michel, CIRAD-BIOS-UMR PVBMT (MDG) ORCID: 0000-0001-9867-9098
• Ramarosandratana Aro Vonjy, Université d'Antananarivo (MDG)
• Fuzzati Nicola, CHANEL Parfums Beauté (FRA)
• Besse Pascale, Université de la Réunion (REU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/609713/)

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