Effect of manganese on concentrations of Zn, K, Ca and Mg in two bush bean cultivars grown in solution culture

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Abstract
Two bush bean cultivars [P. vulgaris L. cv. Wonder Crop 2 (WC-2) and Green Lord (GL)], differing in Mn toxicity, were grown in a growth chamber for 12 days in Hoagland No. 2 nutrient solution containing 0.05 to 1 ppm Mn as MnCl2 .cntdot. 4H2O with 1 ppm Fe as Fe-EDTA, at an initial pH 5.0. Concentrations of Zn, K, Ca and Mg in the tissues of 2 bush bean cultivars were examined in relation to Mn toxicity. The concentration of Zn in the leaves of Mn-sensitive WC-2 increased significantly with increasing Mn concentrations in the solution, but such levels were not toxic to the plants. The percent distribution of Zn and K in Mn-sensitive WC-2 plants (percent of total uptake) significantly increased in the tops and decreased in the roots with increasing Mn concentration in the nutrient solution; however, Mn treatment had no effect on distribution of either Ca or Mg in WC-2. External Mn concentration had little or no effect on the K, Ca or Mg concentrations in the tops of Mn-tolerant GL.

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