Palombieri et al. 2023 — Cadmium content and micronutrient characterization of Triticum turgidum subspecies
This study characterized technological properties and nutritional quality (including toxic cadmium content) across multiple accessions of three Triticum turgidum subspecies — durum (standard pasta wheat), turanicum (Khorasan/KAMUT), and polonicum (Polish wheat) — grown for two seasons in Central Italy. A key finding for the wiki is the identification of a Polish wheat accession (Pol2) that showed lower cadmium content in grain compared to other accessions, along with better technological performances and higher micro- and macro-nutrient accumulation. The study demonstrates that Cd content varies among wheat subspecies and accessions, reinforcing that cultivar selection is a lever for reducing dietary Cd exposure from wheat-based foods.
Key numbers
The paper does not report numeric Cd concentrations in the abstract; it identifies Pol2 (a Polish wheat accession) as showing lower toxic cadmium compared to the studied accessions, while simultaneously showing better technological quality and higher beneficial micronutrient content. Quantitative grain Cd concentrations are reported in the full text tables (not captured in the available text portion).
Root morphology finding: Pol2 showed the highest shoot:root ratio, attributed to decreased root growth rather than reduced uptake efficiency — instead, Pol2’s particular root morphology made it more efficient for nutrient uptake (greater accumulation of micro- and macro-nutrients), likely contributing to the differential Cd accumulation pattern.
Methods (brief)
Two-year field experiment at “Nello Lupori” experimental farm, University of Tuscia, Viterbo, Italy (2018–2019 and 2019–2020). Randomized block design, three blocks. Grain Cd and micronutrient content measured by ICP-based methods (specific method details in full text). Root morphological traits assessed. The study selected five accessions each of turanicum and polonicum based on a prior screening of 50 accessions (Sestili et al. 2018), plus modern durum wheat cultivar Svevo as a reference.
Implications
Certification: Cultivar selection within wheat subspecies is a documented lever for reducing grain Cd; Polish wheat accessions with low Cd are potentially valuable in ingredient sourcing for lower-cadmium durum/pasta products. The finding that the low-Cd accession also has better nutritional quality removes the typical trade-off assumption.
Courses: The subspecies-level variation in Cd uptake underlines that “wheat” is not a uniform risk category; Khorasan and Polish wheats are marketed as healthier alternatives but their Cd profile requires varietal-level investigation.
App: Wheat ingredient pages should distinguish between subspecies and note that Cd varies by cultivar and accession, not just by species.