Enhanced seed productivity in oilseed rape through targeted genex expression in inflorescence meristems

Overview

This research addresses a central challenge in agriculture: increasing crop yield. The approach focuses on the inflorescence meristem (IM), the stem cell zone in the upper part of the plant that produces flowers and, ultimately, fruits and seeds. By enhancing the activity of this meristem, it is possible to directly influence important agronomic traits such as fruit and seed productivity.

Preliminary work in Arabidopsis demonstrated that expressing geneX under the control of the IM-specific FLOWERING LOCUS D (FD) promoter significantly increased fruit and seed productivity. The current proposal extends this finding to oilseed rape, a major Brassica crop, by expressing geneX under a selection of IM-specific promoters and evaluating the effects on yield-related traits.

Technical specifications

Core approach:

• Heterologous expression of the Arabidopsis geneX cDNA in oilseed rape under IM-specific promoters
• Use of oilseed rape-derived BaFD and TERMINAL FLOWER1 (BaTFL1) promoters to drive meristem-specific expression
• Agrobacterium-mediated transformation using established tissue culture protocols

Validation plan:

• Generation of at least 10 to 15 independent transgenic lines per construct
• Quantitative assessment of fruit and seed productivity across transgenic lines
• Comparison of multiple IM-specific promoter constructs to identify the most effective configuration

Key scientific rationale:

• The IM activity directly contributes to fruit and seed set
• Meristem-targeted gene expression offers a targeted strategy to enhance yield without broadly altering plant development

Technology readiness level

The technology is at an early to mid-stage research and development phase. Proof-of-concept data has been obtained in Arabidopsis, showing that IM-specific expression of geneX substantially increases fruit and seed productivity. The current work represents the first translation of this finding into a crop species (oilseed rape), with transgenic line generation and phenotypic evaluation underway. Further validation in field-relevant conditions and additional crop species would be needed before commercial deployment.