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Getting to the Route: The Evolution of Nitrogen-Fixing Nodules
Anindya Kundu1, Thiago Alexandre Moraes2, R Jordan Price1
1National Institute of Agricultural Botany Trust (NIAB), Cambridge, United Kingdom;
This review explores the evolution of root nodule symbiosis, focusing on how early forms of this nitrogen-fixing plant-microbe interaction may have been less complex. Understanding the ancestral state of nodulation can inform current agricultural applications.
Area of Science:
- Plant-microbe interactions
- Evolutionary biology
- Symbiosis
Background:
- Root nodule symbiosis facilitates plant nitrogen acquisition via bacterial dinitrogen fixation.
- Nodulation exhibits diverse infection modes and morphologies, reflecting evolutionary adaptations.
- Studying ancient forms of nodulation can reveal simpler, ancestral states.
Purpose of the Study:
- To review the evolution of nodule development.
- To identify key events increasing symbiotic complexity in later adaptations.
- To hypothesize the ancestral state of nodulation.
Main Methods:
- Literature review focusing on evolutionary adaptations in nodule development.
- Analysis of bacterial infection strategies and nodule morphologies.
- Hypothesizing ancestral traits based on extant diversity.
Main Results:
- The ancestral form of nodulation likely involved nutrient-dependent lateral root development.
- Aplastic intercellular bacterial growth was probably a feature of early symbiosis.
- An ancestral chitinaceous signaling molecule may have been acquired by microbial symbionts.
Conclusions:
- Understanding the evolutionary trajectory of nodulation provides insights into its basal state.
- The simplest ancestral state of nodulation is hypothesized to be a combination of specific developmental and signaling events.
- Investigating evolutionary adaptations aids in comprehending the diversity of this vital symbiosis.
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