Regulation of Rubidium Uptake in Sunflower Roots

1 January 1979

journal article
research article
Published by Wiley in Physiologia Plantarum

Vol. 45 (1) , 83-87
https://doi.org/10.1111/j.1399-3054.1979.tb01668.x

Abstract

Uptake of Rb⁺was investigated in 12‐day‐old intact plants of sunflower (Helianthus annumL. var.californicus) which had been cultivated or pretreated in nutrient solutions with various K⁺concentrations. The relationship between Rb⁺influx and K⁺concentration of the roots indicated regulation of Rb⁺uptake by allosteric inhibition of the uptake mechanism. A constant passive influx occurred contemporaneously with the active uptake as shown by experiments at 0°C or with 2,4‐dinitrophenol. The allosteric regulation of ion carrier activity occurred after a time lag of up to 1 h after the change of external solution. In experiments involving Rb⁺treatments of K⁺‐deficient plants, the synthesis of carriers for transport of Rb⁺could be demonstrated. A model including allosteric regulation of Rb⁺uptake in roots is discussed.

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