Journal Article A peptide hormone required for Casparian strip diffusion barrier formation in Arabidopsis roots

Nakayama, Takuya  ,  Shinohara, Hidefumi  ,  Tanaka, Mina  ,  Baba, Koki  ,  Ogawa-Ohnishi, Mari  ,  Matsubayashi, Yoshikatsu

355 ( 6322 )  , pp.284 - 286 , 2017-01 , American Association for the Advancement of Science
ISSN:0036-8075
Description
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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