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Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii
Published on: August 18, 2019
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Innovations in two genes kickstarted the evolution of nitrogen-fixing nodules
1Laboratory of Molecular Biology, Plant Science Group, Wageningen University Droevendaalsesteeg 1, 6708PB Wageningen, the Netherlands.
Current Opinion in Plant Biology
|September 11, 2023
Summary
Plant root nodule symbiosis with nitrogen-fixing bacteria originated 110 million years ago. Key genetic adaptations, including receptor complex changes and Nodule Inception (NIN) gene recruitment, enabled this ancient symbiosis.
Area of Science:
- Plant biology
- Microbial genetics
- Evolutionary biology
Background:
- Root nodule symbiosis is a specialized trait found in certain plant species, involving nitrogen-fixing bacteria.
- Transferring this symbiosis to nonleguminous crops offers significant agronomic potential.
- This symbiosis has been a subject of extensive research for over a century.
Purpose of the Study:
- To investigate the evolutionary origins of root nodule symbiosis.
- To identify the initial genetic adaptations enabling plant-microbe interaction in this symbiosis.
- To understand the role of specific genes, like Nodule Inception (NIN), in the establishment of symbiosis.
Main Methods:
- Evolutionary analysis to trace the origins of symbiosis.
- Genetic studies focusing on receptor complexes and transcription factors.
- Comparative genomics to identify conserved and novel genetic elements.
Main Results:
- The root nodule symbiosis originated from a single common ancestor approximately 110 million years ago.
- Early genetic adaptations involved changes in a receptor complex and the recruitment of the Nodule Inception (NIN) transcription factor.
- These adaptations were crucial for the plant ancestor to recognize and respond to its bacterial microsymbiont.
Conclusions:
- The evolution of root nodule symbiosis involved specific, early genetic changes.
- Understanding the recruitment and function of genes like NIN provides critical insights into the initiation of this complex plant-microbe interaction.
- These findings contribute to the long-term goal of engineering symbiosis in crops.
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