Physiological Basis of Differential Strontium Accumulation in Two Barley Genotypes

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Abstract
Studies'' of rates of strontium [Sr] transport from nutrient solutions containing 8 [Sr] concentrations indicate a definite trend towards higher Sr transport rates by roots of intact 12-day-old "Regal" barley (Hordeum vulgare, L.] seedlings as compared with the "Tregal" variety. Dif-ferences in Sr transport rates between the 2 varieties were indicated by higher concentrations of Sr in fluids exuding from decapitated Regal" and "Tregal" roots. Physical factors such as distance from epidermis to endodermis, number of cortical cell layers, or transpiration rate were alike in both varieties. No relationship was observed between transpiration rate and Sr accumulation rate. There were marked effects of temperature, cyanide, ad dinitrophenol [DNP] on rates of Sr transport. Q10 values for Sr transport by Regal and Tregal approached 2, indicating that metabolic reactions were associated with this process. Sr transport by both Regal and Tregal was markedly depressed In the presence of either cyanide or DNP. Sr transport process is dependent on metabolic energy derived from respiration.

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