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Fig. 7. Aluminum resistance of signalgrass and ruzigrass and its dependence on nutrient concentrations in the growth medium. Resistance to Al was measured at (A) low and (B) adequate nutrient supply, by quantifying its effect on plant growth relative to the corresponding Al-free treatment ([LN + Al]/LN and [AN + Al]/AN, respectively). Values of growth parameters for plants from the LN treatment in the greenhouse were 47.3 mg (shoot dry weight, SDW), 18.3 mg (root dry weight, RDW), 15.3 cm2 (leaf area, LA), and 5.98 m (root length, RL) for signalgrass, and 52.8 mg (SDW), 22.7 mg (RDW), 19.1 cm2 (LA), and 5.92 m (RL) for ruzigrass. Corresponding values in the growth chamber were 34.5 mg (SDW), 6.2 mg (RDW), 13.8 cm2 (LA), and 1.15 m (RL) for signalgrass, and 58.3 mg (SDW), 11.8 mg (RDW), 21.2 cm2 (LA), and 1.89 m (RL) for ruzigrass. The values for plants from the AN treatment are listed in the legend to Fig. 5. Error bars designate standard errors computed by weighted jackknifing, and asterisks indicate statistically significant differences between the two grasses (P < 0.05).
