Plant growth depends on the uptake of potassium from soil. The degree to which inward-rectifying potassium channels participate in this process was tested by a combination of genetics and electrophysiology in the root of Arabidopsis thaliana (pictured). Unexpectedly, membrane potentials more negative than 230 millivolts enabled the channels to take up potassium from external solutions as dilute as 10 micromolar. See page 918. [Image: E. P. Spalding]

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