Canola heat stress tolerance and seed yield enhancement through PDAT gene overexpression

Overview

Canola is a major oilseed crop whose value chain depends heavily on seed oil production, yet it is vulnerable to heat stress, which can reduce both yield and oil quality. This research proposes overexpressing the Brassica napus Phospholipid:Diacylglycerol Acyltransferase (BnaPDAT) gene to simultaneously enhance heat stress tolerance and maintain or increase seed yield and oil content. PDAT catalyzes the final step in acyl-CoA independent triacylglycerol biosynthesis, a pathway critical for seed oil accumulation and stress resilience in related plant species.

This approach offers canola breeders, seed companies, and oilseed processors a potential pathway to more resilient crops with stable or improved oil output under elevated temperature conditions. The technology is relevant for growers facing increasing climate variability and for industry stakeholders seeking differentiated, high-performing canola varieties.

Technical specifications

Key features:

• Overexpression of the endogenous canola PDAT gene (BnaPDAT) in a haploid Brassica napus line to produce homozygous transgenic lines
• Targets the triacylglycerol biosynthesis pathway to increase oil accumulation and membrane lipid remodeling under heat stress
• Designed to improve heat tolerance while preserving or enhancing seed yield, oil content, fatty acid composition, and protein content
• Builds on demonstrated PDAT function in Arabidopsis, a closely related model species

Validation approach:

• Greenhouse growth trials comparing BnaPDAT overexpression lines with wild-type controls under heat stress conditions
• Measurement of seed yield, oil content, fatty acid composition, and protein content
• Sample archiving for future molecular and biochemical analyses

Technology readiness level

The project is at an early-to-mid stage of development. Homologous canola plants overexpressing BnaPDAT have been successfully generated and confirmed, with seeds harvested and ready for greenhouse cultivation. The next phase involves a one-year greenhouse validation study to assess heat tolerance and seed quality traits. All required facilities and expertise are available in the researcher's laboratory at the University of Alberta. Commercial deployment would require subsequent field trials, regulatory review, and breeding integration.