Fig. 2. Turnip mosaic virus (TuMV) accumulation (enzyme-linked immunosorbent assay [ELISA] values) in high- and low-Ni Streptanthus polygaloides and S. insignis plants inoculated during the bolting stage. Uninoculated controls (light gray bars) are included to indicate background ELISA values. Columns with the same letters do not differ significantly ( 0.05). Error bars denote 95% confidence intervals

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