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Environmental and Stress Physiology

Salt Tolerance in Suspension Cultures of Sugar Beet ¹

Induction of Na⁺/H⁺ Antiport Activity at the Tonoplast by Growth in Salt

Center for Plant Molecular Biology, McGill University, Montreal, Quebec, Canada H3A 1B1, Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1

Cell suspension cultures of sugar beet were grown at various salinities (0-200 millimolar NaCl). Their tolerance to Na⁺ was comparable to that of the intact plant. Tonoplast vesicles were prepared by sucrose density gradient centrifugation of microsomal membranes and shown to be highly purified. The vesicles were subjected to a pH jump in the presence of acridine orange and the rate of recovery of fluorescence after addition of Na⁺ was used as a measure of Na⁺-dependent H⁺ efflux. In the presence of K⁺ and valinomycin, the Na⁺/H⁺ antiport showed saturation kinetics. Increasing Na⁺ in the growth medium did not change the apparent K_m for Na⁺, but increased V_max to about twice the control value, suggesting a specific induction of antiport synthesis by salt.

¹ Supported by the Natural Sciences and Engineering Research Council of Canada and the Department of Education of Quebec.

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