PostDoc on orchid mycorrhizas physiology in Paris

(10-02-2022) Our 2-year project will use in situ 13C/15N labeling & fungal detection by molecular barcoding methods to unravel the use of carbon from surrounding plants and/or from soil by mycorrhizal fungi, as well as its possible transfer to grassland orchids

 Orchids, as most land plants, form a symbiosis with soil fungi that colonize their roots. The resulting dual organ, the mycorrhiza, is vital for plant nutrition. Yet, the functioning and exchanges of this association and the exact ecology of the mycorrhizal fungi in soils remain poorly known and very debated, especially for grassland orchids. Do fungi provide organic material to the host plant? If yes, what resources do they access in soil, i.e. are they also colonizing the roots of other plants as endophytes and/or are they saprobes in soil? Genomic data provide clues bot cannot answer these functional questions. Moreover, orchids are iconic -if not protected- species and in many cases, out-planting or re-introduction is impossible due to a poor management of the mycorrhizal fungal communities in soils.

Postdoc on Orchid Mycorrhizas