Rice RING e3-ubiquitin ligase technology for modulating root traits and enhancing stress tolerance

Overview

This research program targets the genetic improvement of rice root systems to enhance tolerance to abiotic stresses such as drought and nutrient deficiency. The work centers on a root-specific RING E3-ubiquitin ligase gene identified through in silico analysis of 39 candidates. Genetic manipulation of this gene via overexpression and CRISPR knockout produces rice lines with altered root architecture, with knockout lines showing promising tolerance to multiple stress conditions. The technology addresses a critical need in crop improvement driven by climate change, where enhanced root traits can improve water and nutrient uptake efficiency.

Technical specifications

Key features:

• Identification of a root-specific RING E3-ubiquitin ligase gene that is strongly downregulated under drought conditions
• Development of overexpression (OX) and CRISPR knockout (KO) rice lines with at least 3 independent lines each
• Use of a Negative Segregant (NS) line as an internal control for characterization
• Hydroponic culture-based preliminary characterization showing opposite root phenotypes between OX and KO lines
• Preliminary evidence of enhanced tolerance to nutrient-deficient conditions in KO lines
• Planned validation using an in-house root-phenotyping platform
• Stress assays under drought and nutrient deficiency with physiological evaluation (chlorophyll quantification) and molecular analysis (RT-qPCR)
• Untargeted root metabolomic characterization to identify key metabolites involved in the stress tolerance phenotype

Technology readiness level

The technology is currently at an early-to-mid stage of development (TRL 3-4). Preliminary proof-of-concept data has been generated using hydroponic culture conditions, demonstrating that genetic manipulation of the target E3-ubiquitin ligase gene produces measurable changes in root architecture. Further validation is planned over a 15-month period to fully characterize the root traits, stress response mechanisms, and metabolic profiles associated with the gene's function. Additional data is needed to confirm the tolerance phenotypes under field-relevant stress conditions and to elucidate the molecular pathways involved.