Genetic Improvement of Grass Pea for Sustainable Agriculture

Grass pea (Lathyrus sativus) is an under-exploited legume valued for its exceptional tolerance to drought, waterlogging, salinity and subzero temperatures. Its high seed protein content and nitrogen-fixing ability make it a vital crop for marginal and climate-vulnerable regions, particularly in South Asia, Sub-Saharan Africa and the Mediterranean. However, its wider adoption has been hindered by the accumulation of the neurotoxin β‐L‐ODAP and the risk of neurolathyrism following prolonged consumption. Recent advances in genomics, biochemical analyses and integrative breeding approaches are transforming grass pea from an orphan crop into a reliable component of sustainable agricultural systems. Efforts now focus on elucidating toxin biosynthesis pathways, expanding genetic diversity through germplasm characterisation, deploying marker-assisted selection and exploring genome editing. Such strategies aim to deliver low‐toxin, high-yielding cultivars that combine resilience with improved nutritional profiles, supporting food and feed security under changing climatic conditions.

Research from Nature Portfolio

One breakthrough study presented a high-quality, long-read assembly of the 6.5 Gbp grass pea genome, revealing the enzymatic metabolon responsible for the final step in β-L-ODAP production. By characterising the interaction between an acyl-activating enzyme and a BAHD-acyltransferase, researchers identified key targets for down-regulating toxin synthesis and guiding varietal development. A second, foundational investigation elucidated the cellular mechanism of β-ODAP neurotoxicity, demonstrating how mitochondrial perturbation triggers integrin β1 activation and focal adhesion kinase signalling. The delineation of this pathway offers novel biomarkers for screening and breeding programmes aimed at reducing neurotoxic risk while preserving stress tolerance.

Genetic Improvement of Grass Pea for Sustainable Agriculture publication trend

The graph below shows the total number of articles in genetic improvement of grass pea for sustainable agriculture across all publications each year (not limited to Nature Index journals).

Technical terms

β-L-ODAP: A non-protein amino acid in grass pea linked to neurolathyrism when consumed in high amounts over time.

Metabolon: A transient complex of sequential enzymes that facilitates efficient substrate channeling in a metabolic pathway.

Genome assembly: The computational reconstruction of an organism’s full DNA sequence from sequencing reads.

Neurolathyrism: A paralytic disorder affecting motor neurons, associated with long-term ingestion of β-L-ODAP.

CRISPR/Cas9: A precise genome-editing tool that introduces targeted modifications by guiding the Cas9 nuclease to specific DNA sequences.

References

1. Genomics and biochemical analyses reveal a metabolon key to β-L-ODAP biosynthesis in Lathyrus sativus. Nature Communications (2023).
2. Plant toxin β-ODAP activates integrin β1 and focal adhesion: A critical pathway to cause neurolathyrism. Scientific Reports (2017).
3. Genome sequencing and assembly of Lathyrus sativus - a nutrient-rich hardy legume crop. Scientific Data (2023).
4. Grass Pea (Lathyrus sativus L.)—A Sustainable and Resilient Answer to Climate Challenges. Agronomy (2022).
5. Current Perspectives on Reducing the β-ODAP Content and Improving Potential Agronomic Traits in Grass Pea (Lathyrus sativus L.). Frontiers in Plant Science (2021).