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Bai L.,Institute of Plant Stress Biology | Zhou Y.,Institute of Plant Stress Biology | Ma X.,Institute of Plant Stress Biology | Gao L.,Institute of Plant Stress Biology | Song C.-P.,Institute of Plant Stress Biology
Plant Signaling and Behavior | Year: 2014

[Ca2+]cyt-associated protein kinase (CAP) gene 1 is a receptor-like kinase that belongs to CrRLK1L (Catharanthus roseus receptor like kinase) subfamily. CAP1 has been identified as a novel modulator of NH4 + in the tonoplast, which regulates root hair growth by maintaining the cytoplasmic Ca2+ gradients. Different expression pattern of tonoplast intrinsic protein (TI P2;3) in the CAP1 knock out mutant and wild type on Murashige and Skoog (MS) medium suggested that CAP1 influences transport activity to regulate the compartmentalization of NH4 + into vacuole. Lower expression level of Oxidative Signal-Inducible1(OXI1) in the cap1-1 root and the abnormal reactive oxygen species (RO S) gradient in root hair of cap1-1 on MS medium indicated that RO S signaling involve in CAP1-regulated root hair growth. Wildtype-like RO S distribution pattern in the cap1-1 root hair can be reestablished in seedlings grown on NH4 + deficient medium, which indicated that CAP1 functions as a sensor for NH4 +signaling in maintaining tip-focused RO S gradient in root hairs polar growth. © 2014 Landes Bioscience. Source

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