Résumé
Different cultural techniques are used to cultivate Vanilla. On Reunion Island, V. planifolia is widely cultivated in forest-type land (95% of the production) and a few cultivators have chosen to grow vanilla in shade houses. Two types of substrates are mainly used for the cultivation in shade houses: leaf litter and compost. The diversity of Vanilla rhizosphere bacterial community and endophytes are now known to influence plant health and response to environmental stress. And some bacteria might play an important role in the formation of aroma. The aim of this study was to explore the chemical profile of vanilla beans according to the type of substrate. The composition and diversity of the Vanilla rhizosphere bacterial community were explored by analyzing rhizosphere soil and root tissue samples as well as green pods of three accessions of Vanilla planifolia grown on different types of substrates. The chemical profiles of Vanilla planifolia beans were analyzed and the bacterial composition of the soil, roots, green pods, and cured pods were explored using a metabarcoding approach. The results showed that the non- volatile composition and the vanillin content differed according to the type of substrate. Besides, the bacterial species richness and diversity were higher in the compost substrate. The genera Halomonas, Pseudoalteromonas, Bacillus, and Carboxydocella were found in the beans after scalding and sweating and might contribute directly or indirectly to the formation of aromatic compounds.