Novel approach to enhance lentil transformation and regeneration using BABY BOOM gene expression

Overview

Lentil transformation and regeneration have long been constrained by low efficiency, making genetic improvement of this important pulse crop economically challenging. This research proposes a novel approach that leverages the BABY BOOM (BBM) transcription factor to overcome these limitations. When overexpressed, BBM has been shown to induce somatic embryo formation in non-embryonic plant tissues such as leaves and roots. By incorporating BBM gene expression into transfer DNA constructs, transformed lentil cells can be directed to form somatic embryos rather than relying on traditional callus-based regeneration pathways. This shift has the potential to substantially improve transformation efficiency and reduce the time and cost associated with developing transgenic lentil lines.

Technical specifications

• Core approach: Overexpression of the BABY BOOM transcription factor within T-DNA constructs to promote somatic embryogenesis in transformed lentil explants
• Vector design: BBM gene placed in a binary vector flanked by a 35S promoter and a NOS terminator for constitutive expression
• Target outcome: Production of somatic embryos from transformed explants as a determinant of successful transformation
• Tissue targets: Leaf and root explants, which are non-embryonic tissues that can be redirected toward embryo formation
• Advantage over conventional methods: Somatic embryos are generally easier to propagate in vitro compared to traditional callus tissue, potentially streamlining the regeneration phase
• Application context: Addresses single-digit transformation efficiencies currently reported in lentil, which lag behind model species such as tobacco, Arabidopsis, and maize

Technology readiness level

This project is at an early research and validation stage. The proposed work focuses on evaluating and optimizing novel techniques for lentil transformation and regeneration, with the goal of demonstrating that BBM-driven somatic embryogenesis can enhance both processes. Future validation will involve constructing the binary vector with the BBM expression cassette and assessing somatic embryo production from transformed explants. Further optimization of regeneration protocols and broader testing across lentil genotypes will be needed before commercial deployment.