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Rhizosphere Acidification and Cadmium Uptake by Strawberry Clover

^a Dep. of Biology and Microbiology, South Dakota State Univ., Brookings, SD 57007
^b Plant Science Dep., South Dakota State Univ., Brookings, SD 57007

View larger version (15K): [in a new window]   Fig. 1. Red channel luminosity values and pH values for the agar tubes used to calculate the polynomial trend line. Eight tubes were measured for each pH increment (4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8). The length of each data bar indicates the variation between measurements.

View larger version (38K): [in a new window]   Fig. 2. Dry weight and rhizosphere pH of seedlings grown in orchid agar treated with 15 µM Cd for the 2-wk experiment (A) and the 5-wk experiment (B). Dry weight and total cadmium of seedlings grown in orchid agar for the 2-wk experiment (C) and the 5-wk experiment (D). Cadmium concentrations (µg Cd g-1 plant, dry wt.) and rhizosphere pH for seedlings grown in orchid agar for the 2-wk experiment (E) and the 5-wk experiment (F). Cadmium uptake and rhizosphere pH of seedlings grown in orchid agar for the 2-wk experiment (G) and the 5-wk experiment (H). Linear regression, ANOVA results: (A) R2 = 0.42, Prob > F = <0.0001; (B) R2 = 0.11, Prob > F = <0.0047; (C) R2 = 0.27, Prob > F = <0.0001; (D) R2 = 0.33, Prob > F = <0.0001; (E) R2 = 0.44, Prob > F = <0.0001; (F) R2 = 0.06, Prob > F = <0.0514; (G) R2 = 0.66, Prob > F = <0.0001; (H) R2 = 0.14, Prob > F = <0.0016.

View larger version (23K): [in a new window]   Fig. 3. Mean cadmium concentrations in the roots and shoots of plants from the hydroponic cadmium uptake study. Error bars indicate standard error. (The n values for the roots and the shoots are 26, 25, 28, and 27, respectively, by treatment. Treatments are as follows: Control, no Cd2+; Low, 5 µM Cd2+; Medium, 25 µM Cd2+; High, 50 µM Cd2+.)