The influence of life stage and cultivar on the distribution of cadmium in durum wheat (Triticum turgidum L. var durum, cvs Kyle and Arcola)

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Chan, Debbie Yvonne

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University of Guelph

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This thesis investigates how life stage and cultivar influence the distribution of root applied cadmium among plant parts and examines the relationship between total applied and bioavailable cadmium. Durum wheat cultivars Kyle and Arcola (Triticum turgidum L. var durum) were grown hydroponically in solution containing 0.05, 0.50, 5.0 and 50.0 μg CdL\sp−1 as Cd(NO\sb3)\sb24H\sb2O. Kyle is classified as a grain cadmium accumulator while Arcola is not. Various plant tissues were analyzed for cadmium concentration at four distinct life stages. Root cadmium concentration was unaffected by cultivar and life stage, while shoot cadmium content was influenced by both cultivar and life stage. Internal exclusion mechanisms in the aerial portion of the plants distinguish between the cultivars. More bioavailable cadmium (Cd\sp2+) was present in the nutrient solution surrounding the roots of Kyle than Arcola. This result suggests that either the roots of Kyle alter the surrounding environment making the cadmium more available or that Arcola releases a metal-binding complex that limits the uptake of cadmium.

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life stage, cultivar, cadmium, distribution, root cadmium, cadmium concentration, plant parts, total applied cadmium, bioavailable cadmium, Durum wheat, Kyle, Arcola, Triticum turgidum L. var durum

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