Multiple cyclic nucleotide-gated channels coordinate calcium oscillations and polar growth of root hairs.

Calcium gradients underlie polarization in eukaryotic cells. In plants, a tip-focused Ca -gradient is fundamental for rapid and unidirectional cell expansion during epidermal root hair development. Here we report that three members of the cyclic nucleotide-gated channel family are required to maintain cytosolic Ca oscillations and the normal growth of root hairs.