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Comparative phylotranscriptomics reveals ancestral and derived root nodule symbiosis programmes. | LitMetric

AI Article Synopsis

  • Symbiotic interactions like nitrogen-fixing root nodule symbiosis (RNS) have played a crucial role in shaping ecosystems throughout evolutionary history.
  • The study focused on reconstructing the ancestral and intermediate steps of RNS by comparing the transcriptomic responses of nine host plants, including the legume Mimosa pudica, for which a detailed genome was created.
  • Results indicated that key symbiotic responses such as bacterial signaling and nitrogen fixation were established in the most recent common ancestor of RNS-forming species over 90 million years ago, while the release of symbiosomes involved more recently evolved genes.

Article Abstract

Symbiotic interactions such as the nitrogen-fixing root nodule symbiosis (RNS) have structured ecosystems during the evolution of life. Here we aimed at reconstructing ancestral and intermediate steps that shaped RNS observed in extant flowering plants. We compared the symbiotic transcriptomic responses of nine host plants, including the mimosoid legume Mimosa pudica for which we assembled a chromosome-level genome. We reconstructed the ancestral RNS transcriptome composed of most known symbiotic genes together with hundreds of novel candidates. Cross-referencing with transcriptomic data in response to experimentally evolved bacterial strains with gradual symbiotic proficiencies, we found the response to bacterial signals, nodule infection, nodule organogenesis and nitrogen fixation to be ancestral. By contrast, the release of symbiosomes was associated with recently evolved genes encoding small proteins in each lineage. We demonstrate that the symbiotic response was mostly in place in the most recent common ancestor of the RNS-forming species more than 90 million years ago.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10356618PMC
http://dx.doi.org/10.1038/s41477-023-01441-wDOI Listing

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