HcTOK1 participates in the maintenance of K+ homeostasis in the ectomycorrhizal fungus Hebeloma cylindrosporum, which is essential for the symbiotic K+ nutrition of Pinus pinaster. (3rd June 2018)

• Record Type: Journal Article
• Authors: Guerrero-Galán, C.; Garcia, K.; Houdinet, G.; Zimmermann, S. D.
• Is Part Of: Plant signaling & behavior. Volume 13:Number 6(2018)
• Publication Date: 2018-06-03
• Subjects: ectomycorrhizal symbiosis -- ion homeostasis -- plant nutrition -- potassium transport -- subcellular localization -- TOK channel; Plant ecophysiology -- Periodicals; Plant cellular signal transduction -- Periodicals; Plant cellular signal transduction; Plant ecophysiology; Periodicals; Electronic journals; 581
• DOI: 10.1080/15592324.2018.1480845
• Languages: English
• ISSNs: 1559-2316

Abstract

ABSTRACT: Most land plants rely on root symbioses to complement or improve their mineral nutrition. Recent researches have put forward that mycorrhizal fungi efficiently absorb and transfer potassium (K + ) from the soil to host plant roots, but the molecular mechanisms involved are not completely elucidated yet. We have recently revealed that K + is likely released from the fungal Hartig net to the plant by TOK channels in the ectomycorrhizal model Hebeloma cylindrosporum – Pinus pinaster. H. cylindrosporum harbours three TOK members. Herein, we report that one of them, Hc TOK1, has similar features than the yeast Sc TOK1. Moreover, we propose a role for this channel in the transport of K + from the medium to ectomycorrhizal roots under K + starvation.