Journal Article

High-affinity sodium uptake in land plants

Rosario Haro, María A. Bañuelos and Alonso Rodríguez-Navarro

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 1, pages 68-79
Published in print January 2010 | ISSN: 0032-0781
Published online November 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp168
High-affinity sodium uptake in land plants

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High-affinity Na+ uptake in plants and its mediation by HKT transporters have been studied in very few species. This study expands the knowledge of high-affinity Na+ uptake in land plants for both uptake characteristics and involvement of HKT transporters. In non-flowering plants, we analyzed the Na+ content of wild mosses, carried out experiments on K+ and Na+ uptake in the micromolar range of concentrations with the moss Physcomitrella patens and the liverwort Riccia fluitans, studied a Δhkt1 mutant of P. patens and identified the HKT genes of the lycopodiophyta (clubmoss) Selaginella moellendorffii. In flowering plants we studied Na+ uptake in the micromolar range of concentrations in 16 crop plant species, identified the HKT transporters that could mediate high-affinity Na+ uptake in several species of the Triticeae tribe, and described some characteristics of high-affinity Na+ uptake in other species. Our results suggest that high-affinity Na+ uptake occurs in most land plants. In very few of them, rice and species in the Triticeae and Aveneae tribes of the Poaceae family, it is probably mediated by HKT transporters. In other plants, high-affinity Na+ uptake is mediated by one or several transporters whose responses to the presence of K+ or Ba2+ are fundamentally different from those of HKT transporters.

Keywords: HKT transporters; Land plants; Physcomitrella patens; Sodium transport

Journal Article.  8562 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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