Abstract
The uptake of potassium, sodium, chloride, nitrate, phosphate, and sulphate ions by washed slices of red beetroot tissue is inhibited by d-serine ; 1–5 mM d-serine reduces salt uptake by 40–50 per cent in 3 hr at 25°. d-Serine also inhibits sodium, phosphate, and sulphate uptake by washed carrot and turnip slices and by excised pea roots. d-Alamine and d-threonine also inhibit potassium and sulphate uptake by beet slices but are not as effective as d-serine, whereas l-serine, l-alanine, and l-threonine show no efiect. Pretreatment with d-serine inhibits the subsequent uptake of salt from a solution lacking the inhibitor. The uptake of d-serine is not affected by a variety of potassium and sodium salts. d-Serine does not affect the efflux of accumulated sulphate. The rate of oxygen uptake by beet slices and pea roots in the presence of salt is not affected by d-serine nor is the lower rate of oxygen uptake in water. d-Serine appears to uncouple salt uptake from respiration.
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