Résumé
Revealing the mechanisms of perception of Nod factors is the next great challenge in a quest to understand the determination of partner specificity and subsequent nodule organogenesis in the legume-rhizobia symbiosis. Our biochemical approach to this problem has revealed that Medicago contains at least two high affinity proteins for LCOs (related to NFBS1 and NFBS2) but it remains to be seen whether they correspond to putative receptors for the symbiotic Nod factor signals.