| Popis: |
Purpose To decrease the transfer of cadmium (Cd) to the food chain, it is essential to select wheat (Triticum aestivum L.) germplasm that accumulates the least amount of Cd and to develop management practices that promote a reduction in Cd uptake. This requires knowledge of factors controlling Cd accumulation in wheat plants, which are not fully understood. The aim of this study was thus to investigate variations in Cd accumulation, translocation, and subcellular distribution in response to supplemental Si in two wheat cultivars that have different Cd accumulation capacities. Methods Cd uptake and distribution in two common wheat cultivars, high-Cd ‘LCS Star’ and low-Cd ‘UI Platinum’ were evaluated at two levels of Cd (0 and 50 µM) and Si (0 and 1.5 mM) in a hydroponic experiment.Results LCS Star and UI Platinum were not different in root Cd accumulation but differed in Cd concentration in the shoot, which agreed with the variation between the two cultivars in their subcellular Cd distributions (i.e., cell wall and organelle and soluble fractions) as well as induced glutathione synthesis in response to Cd addition. Supplemental Si reduced Cd uptake and accumulation and suppressed Cd-induced glutathione synthesis.Conclusions The differences between the wheat cultivars in Cd accumulation in shoot mainly derive from root-to-shoot translocation, which is related to subcellular Cd distribution and Cd-induced glutathione synthesis. Exogeneous Si could decrease Cd translocation from root to shoot to alleviate Cd toxicity in common wheat. |
