Chloramphenicol Inhibition of Salt Absorption by Intact Plants

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Abstract
The influence of chloramphenicol on the accumulation of calcium and rubidium by intact barley plants has been investigated. The uptake of both ions during 24 hrs. was reduced by exposure to the inhibitor for 24 hrs. before the uptake period. The main effect was on the fractions of the ions which reached shoots and on those present in roots in non-exchangeable forms. Chloramphenicol also reduced transpiration, but to a considerably smaller extent. The primary effect of chloramphenicol on salt uptake appears to be on the mechanisms of active transport which convey ions across the root. Since chloramphenicol does not affect the uptake of oxygen, it appears that the active accumulation of salts is not directly mediated by the electron transfer in respiration. The results are compatible with the existence of a linkage between salt absorption and protein synthesis; the nature of this linkage is at present unknown.

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