Promoter-driven gene containment for trait expression control in weedy rice hybrids

Overview

The promoter-driven gene containment strategy is an innovative solution to mitigate the risk of trait escape in rice cultivation. This method ensures that herbicide tolerance is expressed only in cultivated rice varieties, while preventing the expression of these traits in weedy rice hybrids. By leveraging background-sensitive promoters, this approach uses the genetic context of cultivated rice to activate trait genes effectively, while the same genes remain inactive in weedy rice backgrounds. This strategy provides a robust tool for maintaining agronomic traits in cultivated rice without contributing to resistance in weed populations.

Technical specifications

Key features:

• Utilizes promoters that are sensitive to the genetic background, ensuring trait expression only in intended cultivars.
• Employs genome-editing techniques, such as CRISPR/Cas, for final implementation without introducing foreign DNA.
• Initial validation through transgenic reporter assays, progressing to direct promoter edits in elite cultivars.
• Phased development approach: transcriptomic analysis, promoter engineering, and field trials to ensure efficacy and scalability.

Applications:

• Herbicide tolerance management in rice agriculture.
• Adaptable for multiple trait genes, providing a versatile platform for various rice production systems.

Technology readiness level

Currently at Technology Readiness Level 2, this containment strategy is in the early stages of development. Comparative transcriptomics and greenhouse testing are underway, with future plans for promoter engineering and field trials. The research is supported by the Institute of Tropical Agriculture and Food Security (ITAFoS) and is open to sponsored research partnerships.