Abstract
Sugar beet (Beta vulgaris ‘F58‐554HI’) plants were cultured hydroponically (pH 6.0) for 3 weeks in a greenhouse with 10 concentrations of Mn in culture solutions; 0.44, 4, 8, 16, 32, 64, 128, 256, 550, and 1,000 mg Mn/liter. Dry weights of roots and leaves, numbers of cells, and mean call volume/leaf were unchanged with increases in Mn from 0.44 to 16 mg/liter in the culture solution or with tissue Mn up to about 5,000 mg/kg dry matter. With further increase to 30 or 40 mg Mn/liter in the culture solution dry matter yields were diminished by 50%, with tissue Mn concentrations of about 20,000 mg/kg. Manganese toxicity reduced the numbers of cells/leaf and the average leaf cell volume and produced smaller leaf and root dry weights.
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