Evolution of nin and NIN-like genes in relation to nodule symbiosis

Jieyu Liu, Ton Bisseling*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)


Legumes and actinorhizal plants are capable of forming root nodules symbiosis with rhizobia and Frankia bacteria. All these nodulating species belong to the nitrogen fixation clade. Most likely, nodulation evolved once in the last common ancestor of this clade. NIN (NODULE INCEPTION) is a transcription factor that is essential for nodulation in all studied species. Therefore, it seems probable that it was recruited at the start when nodulation evolved. NIN is the founding member of the NIN-like protein (NLP) family. It arose by duplication, and this occurred before nodulation evolved. Therefore, several plant species outside the nitrogen fixation clade have NLP(s), which is orthologous to NIN. In this review, we discuss how NIN has diverged from the ancestral NLP, what minimal changes would have been essential for it to become a key transcription controlling nodulation, and which adaptations might have evolved later.

Original languageEnglish
Article number777
Number of pages15
Issue number7
Publication statusPublished - Jul 2020


  • Actinorhizal-like plants
  • Evolution
  • Legume
  • NLP (NIN-like Proteins)
  • Root nodule symbiosis


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