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Inhibition of Anion Transport in Corn Root Protoplasts ¹

Central Research and Development Department, Experimental Station, E. I. du Pont de Nemours and Company, Wilmington, Delaware 19801

The effects of several amino-reactive disulfonic stilbene derivatives and N-(4-azido-2-nitrophenyl)-2-aminoethylsulfonate on Cl^–, SO₄^2–, and inorganic phosphate (Pi) uptake in protoplasts isolated from corn root tissue were studied. 4-Acetamido-4'-isothiocyano-2,2'-stilbenedisulfonic acid, 4,4'-diisothiocyano-2,2'-stilbenedisulfonic acid, 4,4'-diamino-2,2'-stilbenedisulfonic acid, and NAP-taurine inhibited Cl^– and SO₄^2– but not Pi and K⁺ uptake in corn root protoplasts; whereas mersalyl inhibited Pi but not Cl^– or SO₄^2– uptake. The rate of uptake of all anions decreased with increasing external pH. In addition, these reagents markedly inhibited plasmalemma ATPase activity isolated from corn root tissue. Excised root segments were less sensitive to Cl^– and SO₄^2– transport inhibitors.

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