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Abstract :

Root nodule symbiosis (RNS) evolved in the common ancestor of four orders namely Fabales, Cucurbitales, Fagales and Rosales forming the nitrogen-fixing clade (NFN). Although genes involved in the regulation of this symbiosis are now well characterized in model species such as Medicago truncatula or Lotus japonicus in Fabales but also Parasponia andersonii in Rosales, whether there is a global shared response across species is still unknown. Using an innovative approach combining phylogenomic and expression data at different time points of nodulation for species from Fabales, Rosales and Cucurbitales, we aimed to decipher the existence of a shared transcriptional response across evolutionary distant nodulating species. Even though all these species are evolutionary distant and also interact with different bacterial partners, our results revealed that they shared a high number of deregulated genes during the symbiosis These findings highlights for the first time a large shared transcriptional response to nodulation conserved in the different NFN orders, suggesting a conserved response to RNS inherited from the common ancestor of NFN.

References

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