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CEP-CEPR1 Signalling in Cereal Crops: Integrating Nitrogen Demand, Root System Architecture, and Drought Resilience.
Baber Ali1,2, Zeeshan Khan3, Nijat Imin1
1Faculty of Engineering, Computing and Science, Western Sydney University, Penrith, New South Wales, Australia.
C-terminally encoded peptide (CEP) hormones regulate cereal root growth under stress. Research shows CEP signaling impacts root architecture and drought tolerance, offering new strategies for crop improvement.
Area of Science:
- Plant Molecular Biology
- Crop Physiology
- Agricultural Science
Background:
- Cereal crops are vital for global food security, supplying over half of human caloric intake.
- Root system development under water and nitrogen limitation is crucial but poorly understood in cereals.
- The C-terminally encoded peptide (CEP) hormone family regulates plant development and stress responses in model species.
Purpose of the Study:
- To synthesize current knowledge of CEP biology within the context of cereal root systems.
- To identify conserved and divergent CEP signaling mechanisms between dicots and cereals.
- To highlight research gaps and propose strategies for improving cereal crops under abiotic stress.
Main Methods:
- Review of existing literature on CEP signaling in model plants and cereals.
- Analysis of functional data from Arabidopsis complementation assays and CRISPR-Cas9 knockouts in barley.
- Comparative analysis of CEP family gene functions across different cereal species.
Main Results:
- CEPR1 orthologues in barley, maize, and rice are functionally conserved and can rescue Arabidopsis phenotypes.
- CRISPR-Cas9 knockout of CEPR1 in barley affects seminal root angle, with associated complexities.
- TaCEP15 in wheat demonstrates functional diversification, influencing primary root length and drought tolerance via a distinct pathway.
Conclusions:
- CEP signaling plays a conserved role in regulating cereal root architecture and stress responses.
- Functional diversification within the CEP family suggests complex regulatory roles in crops.
- Targeting CEP pathways offers promising avenues for enhancing cereal crop resilience to drought and nitrogen limitation.
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