ArticlePest management science2026
Introgressed Brassica napus × Sinapis alba enhance resistance to the crucifer flea beetle (Phyllotreta cruciferae).
Article in Pest management science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe crucifer flea beetle (Phyllotreta cruciferae) is an invasive pest of Canadian canola, and its management would benefit from durable host plant resistance. Brassica napus has limited inherent insect resistance, whereas Sinapis alba exhibits resistance or tolerance to multiple insect pests. Consequently, introgressed lines combining B. napus and S. alba offer opportunities to identify resistant traits and develop canola-quality germplasm with enhanced defenses. This study examined host plant resistance B. napus lines carrying S. alba introgressions and explored underlying resistance mechanisms. Intergeneric hybrids were generated via embryo rescue, followed by multiple backcrosses to B. napus and the development of double haploid mapping populations. Seven intergeneric hybrids and their parental lines were used in feeding bioassays conducted with P. cruciferae collected on the Canadian Prairies. Glucosinolate profiles, chlorophyll content, trichome density and linear electron flow (LEF) were quantified in seedlings of introgressed and parental genotypes.
resultsFifteen distinct glucosinolate profiles were identified, with significant variation among lines. Introgressed lines with elevated glucosinolate concentrations sustained significantly less feeding damage than those with lower levels. This resistance was linked to chromosome SA02, which harbors several glucosinolate quantitative trait loci. Higher glucosinolate levels were positively correlated with chlorophyll content and LEF. Trichomes were present only in the S. alba parental line, indicating that constitutive physical defenses played a minor role compared to chemical defenses.
conclusionThese findings underscore the potential of introgressed lines to enhance defense mechanisms against flea beetle damage and support research to optimize host plant resistance in canola breeding programs. © 2026 His Majesty the King in Right of Canada and The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. Reproduced with the permission of the Minister of Agriculture and Agri-Food.
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