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. 2017 Jan 20;355(6322):284-286.
doi: 10.1126/science.aai9057.

A Peptide Hormone Required for Casparian Strip Diffusion Barrier Formation in Arabidopsis Roots

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A Peptide Hormone Required for Casparian Strip Diffusion Barrier Formation in Arabidopsis Roots

Takuya Nakayama et al. Science. .

Abstract

Plants achieve mineral ion homeostasis by means of a hydrophobic barrier on endodermal cells called the Casparian strip, which restricts lateral diffusion of ions between the root vascular bundles and the soil. We identified a family of sulfated peptides required for contiguous Casparian strip formation in Arabidopsis roots. These peptide hormones, which we named Casparian strip integrity factor 1 (CIF1) and CIF2, are expressed in the root stele and specifically bind the endodermis-expressed leucine-rich repeat receptor kinase GASSHO1 (GSO1)/SCHENGEN3 and its homolog, GSO2. A mutant devoid of CIF peptides is defective in ion homeostasis in the xylem. CIF genes are environmentally responsive. Casparian strip regulation is not merely a passive process driven by root developmental cues; it also serves as an active strategy to cope with adverse soil conditions.

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