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Influence of Dimethyl Sulfoxide (DMSO) on Nutrient Uptake by Potatoes and Bush Beans¹

Greenhouse investigations were conducted on the effects of dimethyl sulfoxide (DMSO), as an additive to the growth media, on the uptake of P, Zn, and Mn by potatoes, Solanum tuberosum L., and bush beans, Phaseolus vulgaris L. In initial work, severe phytotoxicity occurred with beans when DMSO was applied in excess of 0.1% (wt/wt) to a mixture of Chehalis soil and sand. Severe marginal burning and desiccation of foliage of both crops occurred at higher DMSO concentrations. No visible toxicity or significant yield reductions occurred when DMSO was applied to soil at concentrations less than 0.01%.

DMSO significantly increased the uptake of Mn and decreased P uptake by beans when applied to soil at concentrations in excess of 0.01%. Hydroponic experiments with ⁵⁴Mn in combination with DMSO indicated that the influence on Mn and P uptake is likely mediated through a change of pH of the growth medium rather than permeability changes of the root membrane.

Key Words: Phytotoxicity • Nutrients

² Former Graduate Student in Radiation Biology, Professor of Horticulture, and Associate Professor of Biology, Oregon State University. Senior author now in Department of Plant Science, University of New Hampshire, Durham, N. H.

Received for publication October 17, 1969.