MIZ1 regulates ECA1 to generate a slow, long-distance phloem-transmitted Ca²⁺ signal essential for root water tracking in Arabidopsis.

ABSTRACT: Ever since Darwin postulated that the tip of the root is sensitive to moisture differences and that it "transmits an influence to the upper adjoining part, which bends towards the source of moisture" [Darwin C, Darwin F (1880) The Power of Movement in Plants, pp 572-574], the signal underlying this tropic response has remained elusive. Using the FRET-based Cameleon Ca²⁺ sensor in planta, we show that a water potential gradient applied across the root tip generates a slow, long-distance asymmetric cytosolic Ca²⁺ signal in the phloem, which peaks at the elongation zone, where it is dispersed laterally and asymmetrically to peripheral cells, where cell elongation occurs. In addition, the MIZ1 protein, whose biochemical function is unknown but is required fo

SUBMITTER: Shkolnik D 

PROVIDER: S-EPMC6077737 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature