Journal
SCIENCE
Volume 355, Issue 6322, Pages 284-286Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aai9057
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Funding
- Japan Society for the Promotion of Science (JSPS) [25221105, 15H05957]
- JSPS [26113520, 16H01234, 25840111]
- Grants-in-Aid for Scientific Research [15H05957, 25840111, 16H01234, 15H05955, 26113520] Funding Source: KAKEN
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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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