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Abstract
Bean plants (Phaseolus vulgaris) were very sensitive to moderate concentrations of NaCl, showing a dramatic decrease in their K+ content in the presence of this salt. Increasing the KCl content of the nutrient medium released the inhibitory effect of NaCl by increasing the K+ content of the plants. Likewise moderate concentrations of KCl were toxic for bean plants because they produced a large K+ loading. NaCl partially released this toxicity by inhibiting the K+ loading. When compared to the moderately salt tolerant sunflower plants (Helianthus annuus), bean plants showed a lower capacity to discriminate between K+ and Na+, at high Na+ levels, and an uncontrolled K+ uptake at moderate concentrations of K+. It is concluded that this low capacity of discrimination of the K+ uptake system of bean plants in presence of Na+ can account for by the NaCl sensitivity of bean plants.
Published Version
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